Patent Description:
The disclosure is directed to fiber optic terminals having variable ratio couplers for changing the output power level of optical outputs along with fiber optic networks using the terminals.

Optical fiber is increasingly being used for a variety of applications, including but not limited to broadband voice, video, and data transmission. As bandwidth demands increase optical fiber is migrating deeper into communication networks such as in fiber to the premises applications such as FTTx, <NUM> and the like. As optical fiber extends deeper into communication networks there exist a need for building more complex and flexible fiber optic networks in a quick and easy manner.

Terminals such as multiports or closures were also developed for making one or more optical connections with hardened connectors such as the OptiTap® plug connector. Prior art multiports have an input cable or input port with a plurality of receptacles mounted through a wall of the housing for protecting an indoor connector inside the housing that makes an optical connection to the external hardened connector of the branch or drop cable.

Illustratively, <FIG> shows a conventional fiber optic multiport <NUM> having an input fiber optic cable <NUM> carrying one or more optical fibers to indoor-type connectors inside a housing <NUM>. The multiport <NUM> receives the optical fibers into housing <NUM> and distributes the optical fibers to receptacles <NUM> for connection with a hardened connector. The receptacles <NUM> are separate assemblies attached through a wall of housing <NUM> of the multiport <NUM>. The receptacles <NUM> allow mating with hardened connectors attached to drop or branching cables (not shown) such as drop cables for "fiber-to-the-home" applications. During use, optical signals pass through the branch cables, to and from the fiber optic cable <NUM> by way of the optical connections at the receptacles <NUM> of multiport <NUM>. Fiber optic cable <NUM> may also be terminated with a fiber optic connector <NUM>.

Multiports <NUM> allow quick and easy deployment by service providers for passive optical networks. Further, multiport <NUM> may use a coupler or splitter inside the multiport to allow a single input optical signal to be split into multiple output channels. By way of explanation, the input fiber optic cable may have a single optical fiber that is in optical communication with a <NUM>:N splitter for outputting N output signals. However, the power level of the input optical channel is divided among the N output signals in a passive optical network (e.g., no active components are used in the passive portion of the optical network). By way of explanation, a <NUM>:<NUM> coupler may split the power from the single input optical fiber as <NUM>% power for the first output optical signal and <NUM>% power for the second output optical signal. Other couplers may have unequal splits in the power level as desired such as splitting the power from the single input optical fiber as <NUM>% power for the first output optical signal and <NUM>% power for the second output optical signal depending on the requirements for the fiber optic network. Furthermore, multiports may be daisy-chained together for building more complicated fiber optic networks with further power level splits for the distribution of passive optical signals. By way of a simple explanation, an input optical signal from the central office may be able to accommodate a total split of <NUM>:<NUM> for the given input power level of the optical signal. An upstream multiport may have a <NUM>:<NUM> split with equal power levels for the two output fibers that each feed separate downstream multiports having a further <NUM>:<NUM> split with equal power levels, thus the single input fiber is split into <NUM> output signal each having an equal power level.

However, conventional couplers or splitters have a fixed power level split for the output signals. This fixed power level split does readily allow for easy modification to the fiber optic network due to changed circumstances such as adding new customers or adapting the power levels needed for different loss budgets across the length of the passive optical network.

Consequently, there exists an unresolved need for terminals that provide quick and easily deployment for the fiber optic network in a flexible manner while also addressing concerns related to limited space, organization, or aesthetics.

<CIT> is directed to a variable coupler fiber optic sensor in which a fused, tapered, biconical directional fiber optic coupler is encapsulated in a stress birefringent medium whose index of refraction changes with applied stress. An accelerometer with a fused, biconical, directional coupler is disposed within a rigid cylinder with input fibers and output fibers extending through the cylinder wall and held in place by epoxy. The interior of rigid cylinder is filled with a stress birefringent silicone elastomer that encapsulates coupler.

<CIT> discloses a fiber optic terminal with ports for making connections with optical connectors terminated to respective of the fiber optic cables.

<CIT>, <CIT>, <CIT>, <CIT> and <CIT> disclose other prior art.

The disclosure is directed to fiber optic terminals (hereinafter "terminals") and fiber optic networks comprising variable ratio couplers. The terminals with variable ratio couplers allow the power levels for the optical outputs from the variable ratio coupler to be changed as desired, thereby providing flexibility for the network operators to adapt or customize their network for their given needs.

The present invention provides a fiber optic terminal according to claim <NUM>.

It is to be understood that both the foregoing general description and the following detailed description present embodiments that are intended to provide an overview or framework for understanding the nature and character of the claims. The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated into and constitute a part of this specification. The drawings illustrate various embodiments and together with the description serve to explain the principles and operation.

Reference will now be made in detail to the embodiments of the disclosure, examples of which are illustrated in the accompanying drawings.

The concepts disclosed are related to fiber optic network and fiber optic terminals having at least one variable ratio coupler with a control for changing an output power level between a first optical output and a second optical output for a passive optical network. As used herein, "variable ratio coupler" means that the output power level may be adjusted to many different power level splits across the spectrum of output power levels so that the power level split may be tuned or changed by the user as desired in a passive operation that doesn't require consuming energy for its operation, and does not mean the power level may only be changed to two discrete power level splits. Consequently, the fiber optic terminals (hereinafter "terminals") comprising the variable ratio coupler(s) (hereinafter "VRC(s)") are well-suited for passive optical networks such as in the outside plant environment such as downstream from a central office location or the like, but other applications are possible.

In addition to the passive operation and providing a wide range of possible output power split levels, the concepts using the VRC disclosed provide a stable performance across varying conditions. Further, the terminals and networks using the VRC have a low polarization dependent loss (PDL). In other words, the polarization state of the optical signal does not adversely impact the performance of the terminals or networks. Thus the polarization state of the optical signal is not a factor for performance or operation. By way of example, the PDL loss is about <NUM> dB or less, and may even be as low as <NUM>. 3dB or less or <NUM>. 2dB or less for any polarization state of the input optical signal.

Still further, terminals and networks using the VRC have a wide wavelength range for suitable performance. By way of example, the terminals and networks using VRC comprise a similar performance from about <NUM> to about <NUM>. Generally speaking, the terminals disclosed and explained in the exemplary embodiments are multiports, but the concepts disclosed may be used with any suitable terminal such as closures, network interface devices, wireless radios or the like having at least one variable ratio coupler with a control for changing an output power level.

The concepts disclosed advantageously provide flexibility for the network operators and also reduce manufacturing complexity and inventory concerns for manufacturers of the terminals along with network operators since the need to manufacture and stock a multitude of terminals having different fixed power split levels is not necessary. In other words, the terminals and fiber optic networks disclosed may be adjusted to have the desired power level splits at any point during its lifetime, thereby providing flexibility and adaptability to alter the fiber optic network based on moves, adds or changes to the fiber optic network. The concepts may be used with any suitable terminals and may be especially advantageous with terminals having compact form-factors. The concepts are scalable to any suitable count of input or outputs on a terminal in a variety of arrangements or constructions for building fiber optic networks.

For instance, the concepts disclosed herein are suitable for fiber optic networks such as for Fiber-to-the-Home and <NUM> applications, and are equally applicable to other optical applications as well including indoor, industrial, wireless, or other suitable applications. The concepts disclosed herein are especially advantageous for asymmetric split fiber optic networks (e.g., fiber optic networks having one VRC with an unequal output power level split). Additionally, the concepts disclosed may be used with terminals having any suitable footprint or construction. Various designs, constructions, or features for fiber optic networks and terminals are disclosed in more detail as discussed herein and may be modified or varied as desired.

<FIG> shows a schematic view of an explanatory fiber optic network <NUM> such as for a passive fiber-to-the-home (FTTH) or network comprising a first terminal <NUM> having a VRC; however, the concepts maybe used with other networks such as a PON, FTTx or <NUM> networks. As depicted, a first optical link 10a (e.g., a first fiber optic cable) is an input optical link connected to a central office CO at a first end and a second end is in optical communication with the optical input OI of the first terminal <NUM>. A first end of a second optical link 10b (e.g., a second optical cable) is an output optical link of terminal <NUM> and is in optical communication with the first optical output (OT1) of the terminal <NUM> as depicted. A second end of the second optical link 10b is in optical communication with the optical input OI of a second terminal <NUM>'. A first end of a third optical link 10c (e.g., a third optical cable) is an output optical link of terminal <NUM>' and is in optical communication with the first optical output (OT1) of the terminal <NUM>' as depicted. A second end of the third optical link 10c feeds into a conventional terminal <NUM> as an input link. A first end of a fourth optical link 10d (e.g., a fourth optical cable) is an output link of conventional terminal <NUM>. A second end of the fourth optical link 10d is in optical communication with the optical input OI of a third terminal <NUM>". A first end of a fifth optical link 10e (e.g., a fifth optical cable) is an output optical link of terminal <NUM>" and is in optical communication with the first optical output (OT1) of the terminal <NUM>" as depicted. The fiber optic network <NUM> splits the power level launched from the CO at the respective terminals <NUM>, <NUM>' and <NUM>'' for the distribution of optical signals to the fiber optic network <NUM>.

Terminals <NUM>, <NUM>' and <NUM>'' are schematically depicted in <FIG> each of which comprise a shell <NUM> having a cavity <NUM> with a portion of the respective VRCs being disposed with the respective cavities <NUM>. The terminals <NUM>, <NUM>' and <NUM>"also comprise at least one input connection port <NUM>, and a plurality of output connection ports <NUM>. The VRCs each also comprise the optical input (OI), the first optical output (OT1), the second optical output (OT2) and a control (CTL) for changing an output power level between the first optical output (OT1) and the second optical output (OT2) as depicted. The input connection port <NUM> may comprise a port opening <NUM> extending from an outer surface (<NUM>) of the terminal <NUM> into the cavity <NUM> and defines a connection port passageway <NUM> along a longitudinal axis. In this embodiment, terminals <NUM>, <NUM>' and <NUM>" of fiber optic network <NUM> comprise the same configuration as depicted; however, the VRCs are adjusted with different output power level split between the respective first optical output (OT1) and second optical output (OT2) using the control (CTL). The output power level split for the VRC may be asymmetric or not depending on the desired output power levels.

By way of explanation, fiber optic network <NUM> distributes the signal from the second optical output (OT2) from the respective VRCs to each local neighborhood where the bandwidth of the optical output is shared by multiple subscribers. For instance, terminal <NUM> may have its VRC adjusted to a <NUM>/<NUM> split of the power received from the central office (CO) (minus losses) with <NUM>% of the input power being directed to the first optical output (OT1) and <NUM>% of the input power being directed to the second optical output (OT2) for the distribution of optical signals to its local neighborhood. Thereafter, terminal <NUM>' that receives <NUM>% of the power transmitted to its optical input (OI) (minus losses such as connector losses, transmission losses, etc.), and may have its VRC adjusted to a <NUM>/<NUM> split of the power received at its optical input (OI) with <NUM>% of the input power to terminal <NUM>' being directed to its first optical output (OT1) and <NUM>% of the input power being directed to its second optical output (OT2) for the distribution of optical signals to its local neighborhood. Terminal <NUM>" that receives <NUM>% of the power from the optical output (OT1) of terminal <NUM>' at the optical input (OI) may have its VRC adjusted to a <NUM>/<NUM> split of the power received with <NUM>% of the input power being directed to the first optical input (OT1) and <NUM>% of the input power being directed to the second optical output (OT2) for the distribution of optical signals to its local neighborhood. This representative fiber optic network <NUM> allows the desired power levels to be transmitted to the local neighborhoods, while transmitting the remaining power downstream in the fiber optic network <NUM> as desired. Moreover, the output power level split ratios within the terminals <NUM>, <NUM>' and <NUM>" may be easily and quickly adjusted by the network operator as needed for moves, adds or changes in the fiber optic network <NUM> as desired, thereby providing flexibility and adaptability that is lacking in conventional fiber optic networks.

<FIG> is a schematic representation of the VRC depicted in terminals <NUM>, <NUM>' and <NUM>''. As depicted, VRC comprises an optical input (OI) that has its output power level split between the first optical output (OT1) and the second optical output (OT2) as schematically represented by a splitter (SPLT) shown as the filled circle along with the control (CTL) for changing the output power level between the first and second outputs (OT1,OT2). The coupler may be a planar lightwave circuit (PLC) or multiclad coupler (MC) as known in the art, but other suitable structures may be used. The optical input (OI) and the optical outputs (OT1,OT2) are optical waveguides such as optical fibers that may be in optical communication with the respective input and outputs of the planar lightwave circuit or other type of device. Control (CTL) may be actuated for changing the output power level between the first optical output (OT1) and the second optical output (OT2) by any suitable means at the coupling region (CR). Although the splitter (SPLT) and coupling region (CR) are depicted as separate elements in the schematic representation of the VRC for the purposes of explanation they typically are one structure in the VRC.

The coupling region (CR) is the region where a portion of the first optical waveguide of the first optical output (OT1) and a portion of the second optical waveguide of the second optical output (OT2) that are in optical (e.g., intimate) contact for allowing the changing of the output power level of the optical signals transmitted by the first optical output (OT1) and the second optical output (OT2). More specifically, the control (CTL) is configured for moving a portion of the first optical waveguide of the first optical output (OT1) and/or moving a portion of the second optical waveguide of the second optical output (OT2) at the coupling region (CR) as represented by the horizontal line with the arrows on the ends. The moving of the first and/or second optical waveguides with the control (CTL) may bend, deflect or change the geometry of between the portion of the first optical waveguide of the first optical output (OT1) and the portion of the second optical waveguide of the second optical output (OT2) at the coupling region (CR) for changing the output power level of the optical signals transmitted by the first optical output (OT1) and the second optical output (OT2). In further embodiments, the portion of the first optical waveguide and the portion of the second optical waveguide are fused together at the coupling region (CR). Other construction are possible for the coupling region (CR) for changing the output power level of the optical signals transmitted by the first optical output (OT1) and the second optical output (OT2). For instance, other embodiments may change the index of refraction of the materials in or around the coupling region (CR).

Any suitable structure may be used for actuating the control (CTL) and changing the output power level split between the first optical output (OT1) and the second optical output (OT2) such as represented by the terminals <NUM> of <FIG>. By way of explanation, the control (CTL) may comprise a fine-threaded adjustment screw (AS) for controlling the bending displacement of the respective portions of first and second optical outputs (OT1,OT2), thereby changing the output power level split as depicted in <FIG>. The adjustment screw (AS) may have a suitable interface attached at one end for moving the first and/or second optical waveguides of the optical outputs at the coupling region (CR). The adjustment screw (AS) may be actuated (e.g., turned) using any suitable structure desired for the application. For instance, the adjustment screw may comprise an end with tip that receives or cooperates a tool for turning or have a knob attached to the adjustment screw so that no tool is needed for adjustment. Still further, the control (CTL) may have a construction so that changing of the output power level be made in a non-contact manner such as depicted in <FIG>. The control (CTL) may also have a specific number of output power level splits such as having detents on a dial for aiding the craft in selecting the desired output power levels without having to measure the output power levels.

More specifically, terminal <NUM> of <FIG> comprises a control interface (CLT INF) disposed on shell <NUM> for changing the output power level between the first and second optical outputs (OT1,OT2) without entering the terminal <NUM>. This non-contact construction allows the VRC and its control (CTL) to be disposed within the shell <NUM>. Consequently, there are no portions related to the VRC and its control (CTL) that require dedicated sealing for environmental protection at the interface with the shell <NUM>. For instance, the control (CLT) may have a magnetic operation for changing the output power level between the first and second optical outputs (OT1,OT2). Specifically, adjustment screw (AS) may have a knob attached that with the knob disposed within the shell <NUM> of the terminal <NUM>. For instance, the knob may comprises a magnetic material portion (e.g., a ferrous material or a magnet) so that a suitable magnet (or ferroumaterial) may be rotated using a non-contact tool (NCT) for making the adjustment and changing the power level split externally to the shell <NUM> of the terminal <NUM>. By way of example, the knob may be formed from a polymer with a magnetic portion such as a ferrous portion so that the knob may be rotated by a magnetic tool that magnetically couples to the knob through the wall of shell <NUM>. As depicted, terminal <NUM> of <FIG> comprises a control interface (CTL INF) configured as a round recess in the shell <NUM> for aligning the non-contact tool (NCT) with the knob of the control (CTL) through the wall of shell <NUM>. By way of explantion, the non-contact tool (NCT) is a round disc with a suitable magnet (MGT) therein as depicted. Non-contact tool (NCT) cooperates with the control interface (CTL INF) such as by seating within the recess of the control interface (CTL INF) and may be coupled to the knob of the control (CTL) magnetically so that when the non-contact tool (NCT) is properly aligned and turned the knob of control (CTL) will also turn for changing the output power level split. Consequently, the adjustment of the control (CTL) may be made through the shell <NUM> of the terminal <NUM> by placing the magnet or ferrous material adjacent to the knob at the control interface (CTL INF) and turning without having to physically contact the knob or the adjustment screw (AS). In this construction, the VRC and its control (CLT) may be completely disposed within to the shell (<NUM>) while also inhibiting unauthorized tampering with the terminal <NUM>.

In other constructions, the VRC and its control (CLT) may be disposed within the cavity <NUM> of a terminal <NUM> such as a re-entrable closure so that only an authorized technician may enter the terminal for changing the output power level split for inhibiting tampering by unauthorized personnel. In these terminal constructions, the entirety of the VRC and its control (CTL) is sealed within the terminal <NUM>. In still other terminal constructions, a portion of the control (CTL) may be disposed external to the shell <NUM> of the terminal <NUM> for providing external access for changing the output power level such as shown in <FIG>.

The concepts disclosed herein may be used with any suitable terminal comprising one or more connection ports as desired for inputs, outputs or pass-throughs. Generally speaking, the terminals <NUM> disclosed herein comprise at least one input connection port <NUM> and at least one output connection port <NUM>,260PT that are defined by an opening extending into a cavity <NUM> of the terminal <NUM>. The connection ports may be configured for receiving external optical connectors or one or more connection ports for receiving fiber optic cables through a wall of the terminal and into the cavity of the terminal. The connection ports may include any suitable mating mechanism or geometry for securing the external connector to the terminal or have any suitable construction for receiving a fiber optic cable into the cavity of the terminal.

Although, these concepts are described with respect to terminals configured as multiports the concepts may be used with any other suitable terminal such as closures, network interface devices, wireless devices, distribution point unit or other suitable devices.

In some embodiments, the connection ports of the terminal may have a push- and-retain connection without the use of threaded coupling nuts or quick turn bayonets for securing the external connectors. This allows for terminals with connection ports that are closely spaced together and may result in relatively small terminals since the room needed for turning a threaded coupling nut or bayonet is not necessary. The compact form-factors may allow the placement of the terminals in tight spaces in indoor, outdoor, buried, aerial, industrial or other applications while providing at least one connection port that is advantageous for a robust and reliable optical connection in a removable and replaceable manner. The disclosed terminals may also be aesthetically pleasing and provide organization for the optical connectors in manner that the prior art terminals cannot provide. However, the external fiber optic connectors may be secured to the terminal using conventional structures such as threads, bayonets or other suitable mating geometry for attaching to the connector ports of the terminal.

Terminals may also have a dense spacing of connection ports for receiving external optical connectors if desired or not. The terminals disclosed herein advantageously allow a relatively dense and organized array of connection ports in a relatively small form-factor while still being rugged for demanding environments; however terminals of any size or shape are possible using the concepts disclosed. As optical networks increase densifications and space is at a premium, the robust and small-form factors for devices such as terminals depicted herein becomes increasingly desirable for network operators.

Returning to the explanatory terminals <NUM> depicted in <FIG> comprising a VRC having a portion disposed within a cavity <NUM> of shell <NUM> with a control (CTL). <FIG> depicts terminal <NUM> comprising at least one input connection port <NUM> and at least one pass-through output connection port 260PT to the right of input connection port <NUM>. This terminal <NUM> comprises two pass-through output connection ports 260PT as shown for the first optical output (OT1) and the second optical output (OT2). Input connection port <NUM> and pass-through output connection ports 260PT are suitable for receiving respective external fiber optic connectors <NUM> of the optical link <NUM> such as shown in <FIG> for making an optical connection with the terminal <NUM>.

<FIG> depicts another explanatory terminal <NUM> that comprises at least one input connection port <NUM> and a pass-through connection port 260PT. In this construction, the terminal <NUM> comprises an optical link 10a configured as a fiber optic cable that is secured to the input connection port <NUM> as a tether cable and optically connected to the optical input (OI) of the VRC. In other words, the fiber optic cable is not intended to be removable from the input connection port <NUM>. The other end of the tether cable may be terminated with a suitable fiber optic for optical connectivity to the fiber optic network.

On the other hand, the pass-through connection port 260PT of terminal <NUM> of <FIG> is in optical communication with the first optical output (OT1) of the VRC. Terminal <NUM> of <FIG> also comprises a second coupler (C2) in optical communication with the second optical output (OT2) of the VRC such as schematically depicted in <FIG>. The second optical coupler (C2) comprises a plurality of second coupler outputs (C201-C20x), and the second coupler outputs (C201-C20x) are in optical communication with a plurality of optical connection ports <NUM>. More specifically, the second coupler outputs may comprise optical fibers extending from the PLC that are optically connected or terminated with respective fiber optic connectors <NUM> disposed within the cavity <NUM> of the terminal and are aligned with the respective port <NUM> for optical connection with the terminal <NUM>. Terminal <NUM> of <FIG> comprises six output connection ports <NUM>, but terminals <NUM> may use any suitable number of output connection ports as desired. The output connection ports <NUM> may be optically connected to drop cables having a suitable connector for routing the optical signals toward the subscribers. <FIG> depict details of a representative construction for the terminals <NUM>.

In further explanation the terminals <NUM> of <FIG>, comprises a shell <NUM> with a cavity <NUM> along with a securing feature <NUM> comprising a securing member <NUM> associated with the connection port passageway <NUM>. The input connection port <NUM>, and pass-through connection ports 260PT each comprises a port opening extending from an outer surface of the terminal <NUM> into the cavity <NUM> of the terminal <NUM> and each port respectively defines a connection port passageway along a longitudinal axis. Each port <NUM>, 260PT has a respective securing member <NUM> is associated with port. Each securing member <NUM> comprises a bore 310B suitable for receiving and securing a portion of the housing <NUM> of the fiber optic connector of the respective optical link such as depicted with the input optical link 10a inserted into the input connection port <NUM>. Likewise, the output connection ports <NUM> where used may have a similar construction as described for the input connection port <NUM> and pass-through connection ports 260PT. Terminals <NUM> may also advantageously use the securing members <NUM> for releasably connecting the external fiber optic connectors <NUM> of the optical links in the respective connection ports using an actuator 310A of securing feature <NUM>.

<FIG> is an exploded view showing details of terminals <NUM>, and <FIG> and <FIG> show an exploded view of a modular sub-assemblies 310SA associated with respective ports <NUM>, <NUM> for releasably securing the external fiber optic connector. Terminal <NUM> of <FIG> comprises an input connection port <NUM> and output connection ports <NUM> configured for receiving external fiber optic connector <NUM>, and the pass-through output connection port 260PT comprises an optical link 10b configured as a fiber optic cable that is secured to the pass-through connection port 260PT as a tether cable and is in optically communication with to the first optical output (OT1) of the VRC. <FIG> depict securing member <NUM> comprising a locking feature <NUM> and will be discussed in further detail. The securing member <NUM> may be used with a securing feature <NUM> for releasably attaching an external fiber optic connector <NUM> of an optical link <NUM> or a drop cable attached to output connection port.

Specifically, each port that may receive an external fiber optic connector <NUM> comprises securing member <NUM> having a locking feature <NUM> that cooperates with locking feature <NUM> of housing <NUM> of respective fiber optic connector <NUM> when the housing <NUM> is fully-inserted into the respective connection port for securing the connector. The housing <NUM> of fiber optic connector <NUM> may have a cooperating geometry that engages the locking feature <NUM> of securing member <NUM> of terminal <NUM>. As best shown in <FIG>depicted, locking feature <NUM> of securing member <NUM> comprises a ramp 310RP. The ramp is integrally formed at a portion of the bore 310B with the ramp angling up when looking into the input connection port <NUM>, connection port <NUM> or pass-through connection port 260PT. The ramp allows the housing <NUM> of fiber optic connector <NUM> to push and translate the securing member <NUM> downward against the securing feature resilient member 310RM as the housing <NUM> is inserted in the input connection port <NUM>. Ramp may have any suitable geometry. Once the locking feature <NUM> of the securing member <NUM> is aligned with the cooperating geometry of the locking feature <NUM> of fiber optic connector <NUM>, then the securing member <NUM> translates upward so that the locking feature <NUM> engages the locking feature <NUM> of the fiber optic connector.

Locking feature <NUM> comprises a retention surface 310RS. In this embodiment, the back-side of the ramp of locking feature <NUM> forms a ledge that cooperates with complimentary geometry on the housing <NUM> (or external connector). However, retention surface 310RS may have different surfaces or edges that cooperate for securing connector for creating the desired mechanical retention. For instance, the retention surface 310RS may be canted or have a vertical wall. However, other geometries are possible for the retention surface 310RS.

Connection ports of terminal <NUM> each comprises a respective optical connector opening <NUM> extending from an outer surface <NUM> of the terminal <NUM> into a cavity <NUM> of the terminal <NUM> and defining a portion of a connection port passageway <NUM> for receiving fiber optic connector <NUM>. By way of explanation, the connection ports may be is molded as a portion of shell <NUM>, but other constructions are possible such as sleeving the ports. At least one securing feature <NUM> is associated with the connection port passageway <NUM> for cooperating with the external fiber optic connector <NUM>.

Returning to <FIG>, terminal <NUM> depicts a portion of an assembly having an explanatory terminal <NUM> comprising a shell <NUM> comprising at least one input connection port <NUM>, a plurality of connector ports <NUM> and a modular adapter sub-assembly 310SA associated with the input connection port <NUM> and each of the plurality of connector ports <NUM> as discussed in further detail herein.

As depicted in <FIG>, terminals <NUM> disclosed may use one or more modular adapter sub-assemblies 310SA (<FIG> and <FIG>) disposed within the shell <NUM> when assembled for a scalable form-factor for manufacturing similar devices with different connector port counts. However, the concepts may be employed without the use of the modular adapter sub-assemblies by having the adapters mounted on a common part, but then the adapters for the individual connection ports would not "float" independently. The shell <NUM> comprises at least one input connection port <NUM> and one or more connection ports <NUM> respectively associated with one or more respective securing features <NUM> cooperating with the connection ports for providing quick and easy optical connectivity with external connectors for providing a robust and reliable assembly design that is intuitive to use. Likewise, terminals <NUM> may use ports for the pass-through ports 260PT as desired.

The securing feature <NUM> advantageously allows the user to make a quick and easy optical connection at the connector port(s) <NUM> of terminal <NUM>. The securing feature <NUM> may also operate for providing a connector release feature by moving the actuator 310A such as a button to translate the securing member <NUM> to an open position (e.g., downward) for releasing the external fiber optic connector <NUM>. As used herein, the "securing member" associated with the terminal and excludes threads and features that cooperate with bayonets. However, other terminals may use any suitable construction for attaching an external connector to the connection port.

External connectors terminated to respective optical links 10x may be retained within the respective ports of the terminal <NUM> by pushing and fully-seating the connector within the port <NUM> if the securing member <NUM> is allowed to translate to an open position when inserting the external fiber optic connector. To release the connector from the respective port, the actuator 310A is actuated by moving the actuator 310A (e.g., pressing the button downward) and translating the securing member <NUM> so that the locking feature disengages from the external connector and allowing the connector to be removed from the port. Stated another way, the at least one securing feature <NUM> is capable of releasing the connector when a portion of the securing feature <NUM> (i. e, the securing member <NUM>) translates within a portion of a securing feature passageway <NUM> of the shell <NUM>. The full insertion and automatic retention of the connector may advantageously allow one-handed installation of the connector by merely pushing the external connector into the respective port. The devices disclosed may accomplish this connector retention feature upon full-insertion by biasing the securing member <NUM> of the modular adapter sub-assemblies 310SA to the retain position. However, other modes of operation for retaining and releasing the connector are possible according to the concepts disclosed. As discussed, the securing feature may be designed to require actuation by translating the actuator 310A for inserting the connector; however, this may require a two-handed operation.

Shell <NUM> may be formed by a first portion 210A and a second portion 210B, but other constructions are possible for shell <NUM> using the concept disclosed. Terminal <NUM> may comprise mounting features 210MF that are integrally formed in the shell <NUM> as shown in <FIG>. Additionally, the mounting features may be separate components attached to shell <NUM> for mounting the device as depicted in <FIG>. By way of example, terminals <NUM> show the shells <NUM> having mounting features 210MF disposed near the sides of shell <NUM>. Thus, the user may simply use a fastener such as a zip-tie threaded thru these lateral passageways for mounting the terminal <NUM> to a wall or pole as desired. In <FIG> another mounting feature 210MF is disposed adjacent the first end <NUM> of terminal <NUM> and includes a mounting tab <NUM> attached to shell <NUM>, and the mounting feature 210MF adjacent the second end <NUM> is a through hole with a support <NUM>. However, mounting features 210MF may be disposed at any suitable location on the shell <NUM> or connection port insert <NUM>. Shell <NUM> may also include one or more notches on the bottom side for aiding in securing the device to a round pole or the like.

Securing member <NUM> may be biased by a resilient member 230RM to the retain position RP (e.g., upward). Furthermore, the securing features <NUM> or portions of securing features <NUM> may be constructed as a portion of a modular adapter sub-assemblies 310SA such as shown in <FIG> and <FIG> for easy assembly of the terminal <NUM>. Moreover, the modular sub-assemblies 230SA advantageously allow the mating components for each connection port <NUM> to move or "float" independently of other mating components relative to the shell <NUM> for the other connection ports for preserving optical performance. "Float" means that the adapter 230A can have slight movement in the X-Y plane for alignment, and may be inhibited from over-traveling in the Z-direction along the axis of connector insertion so that suitable alignment may be made between mating connectors, which may include a biasing spring for allowing some displacement of the adapter 230A with a suitable restoring force provided by the spring.

As best depicted in <FIG>, a portion of actuator 310A is disposed within a portion of the securing feature passageway <NUM> when assembled and cooperates or engages with securing member <NUM> to provide linear downward translation of the respective securing member <NUM>. When assembled, the translating of the actuator 310A causes the securing member to translate from a retain position RP to an open position OP and vice versa. Consequently, a portion of securing feature <NUM> (i.e., the securing member <NUM>) is capable of translating within a portion of the securing feature passageway <NUM> transverse to the longitudinal axis of the connection port passageway when translating the actuator 310A relative to the securing feature passageway <NUM> or shell. If a push and click port is desired when the securing feature <NUM> is in the retain position, then the actuator 310A would only influence the position of the securing member <NUM> in one direction (and a securing feature resilient member 310RM would be used) so that the external connector may be still be inserted when the actuator 310A is placed in the retain position by allowing the translation of the securing member <NUM> downward upon insertion. Actuator 310A may also include a sealing feature (not numbered) for providing a seal between a portion of the securing feature <NUM> and the securing feature passageway <NUM> to inhibit dirt, dust and debris from entering the device. As shown, the sealing feature is disposed on an outer portion of the actuator 310A.

The securing member <NUM> comprises a bore 310B that is aligned with the connection port passageway <NUM> when assembled. Bore 310B is sized for receiving a suitable external connector therethrough for securing the same for optical connectivity. Bores or openings through the securing member <NUM> may have any suitable shape or geometry for cooperating with its respective external connector (or housing <NUM>). As used herein, the bore may have any suitable shape desired including features on the surface of the bore for engaging with the desired connector. Bore 310B is disposed on the securing member <NUM> may also comprise any suitable locking feature disposed within the bore 310B as desired. For instance, the locking feature <NUM> disposed within the bore 310B may be a pin, pin with a ramp, or other suitable structure for engaging with the external connector.

In some embodiments, a portion of the securing member <NUM> is capable of moving to an open position when inserting a suitable external connector <NUM> into the connection port passageway <NUM>. When the connector <NUM> is fully-inserted into the connection port passageway <NUM>, the securing member <NUM> is capable of moving to the retain position automatically. Consequently, the external connector is secured within the respective port by the securing feature <NUM> without turning a coupling nut or a bayonet on the external connector like the prior art terminals. Stated another way, the securing member <NUM> translates from the retain position to an open position as the external fiber optic connector <NUM> is inserted into the respective port. The securing feature passageway <NUM> is arranged transversely to a longitudinal axis LA of the terminal <NUM>, but other arrangements are possible. Other securing features may operate in a similar manner, and use an opening instead of a bore that receives the connector therethrough.

Generally speaking, the connection port passageways may be configured for the specific connector intended to be received in the port. Likewise, the connection port passageways should be configured for receiving the specific rear connector <NUM> for mating and making an optical connection with the external fiber optic connector <NUM>.

The terminal <NUM> may also comprise at least one adapter 230A aligned with the respective connector port <NUM>. Adapter 230A and other components are a portion of the modular sub-assembly 310SA as depicted in <FIG> and <FIG>. Adapter 230A is suitable for securing a rear connector <NUM> thereto for aligning the rear connector <NUM> with the respective port. One or more optical fibers may be routed from the second coupler (C2) to the respective output connector ports <NUM> of the terminal <NUM>. For instance, the rear connectors <NUM> may terminate the optical fibers <NUM>' that are in optical communication with the second coupler (C2) for optical connection at connector ports <NUM>.

A plurality of rear connectors <NUM> are aligned with the respective connection port passageways within the cavity <NUM> of the terminal <NUM>. The rear connectors <NUM> are associated with one or more of the plurality of optical fibers <NUM>'. Each of the respective rear connectors <NUM> aligns and attaches to a structure such as the adapter 230A or other structure related to the connection port passageway in a suitable matter. The plurality of rear connectors <NUM> may comprise a suitable rear connector ferrule 252F as desired and rear connectors <NUM> may take any suitable form from a simple ferrule that attaches to a standard connector type inserted into an adapter. By way of example, rear connectors <NUM> may comprise a resilient member for biasing the rear connector ferrule 252F or not. Additionally, rear connectors <NUM> may further comprise a keying feature.

The rear connectors <NUM> shown in <FIG> and <FIG> have a SC footprint, but other connectors are possible with or without the use of an adapter. As known, the SC footprint may be defined according to IEC <NUM>:<NUM>. If SC connectors are used as the rear connector <NUM> they have a keying feature that cooperates with the keying feature of adapter 230A. Additionally, adapters 230A comprise a retention feature (not visible) for seating the adapters 230A in the device adjacent to the connection port passageway. Further, adapters 230A may comprise latch arms for securing respective rear connectors therein.

The connection port passageways <NUM> may comprise a keying portion disposed forward of the securing feature <NUM> in connection port passageway. The keying portion may be an additive keying portion to the primitive geometric round shape of the input connection port passageway <NUM> such as a male key that is disposed forward of the securing feature in the connection port passageway. However, the concepts for the input connection port <NUM> (or connector port) of terminals may be modified for different housing or connector designs or not use a keying portion at all.

In this embodiment, the rear connectors <NUM> are attached to optical fibers <NUM>' that are in communication with second coupler (C2) which is in optical communication with the second optical output (OT2) as shown. When assembled, the modular adapter sub-assembly 310SA for the connector ports <NUM> are disposed in second portion 210B of shell <NUM>.

Consequently, the second coupler (C2) receives the optical signal with the output power level from the second optical output (OT2) of the VRC as desired for splitting into multiple signals such as 1xN split for distribution of optical signals in the fiber optic network. For instance, the second coupler (C2) may have a 1x8 split within the terminal <NUM> for providing eight second coupler outputs (C201-C208) optical fibers to optically communicate with eight output connector ports <NUM> on the terminal <NUM>, but any suitable number of second coupler outputs are possible. Likewise, the output connector ports <NUM> may be configured as a single-fiber port or multi-fiber port if desired with suitable fiber optic connectors. For the sake of simplicity and clarity in the drawings, all of the optical fiber pathways may not be illustrated or portions of the optical fiber pathways may be removed in places so that other details of the design are visible.

Additionally, the terminals or shells <NUM> may comprise at least one support <NUM> or fiber guide for providing crush support for the terminal and resulting in a robust structure. As depicted in <FIG>, terminal <NUM> may comprise a support <NUM> configured as a support insert that fits into shell <NUM>. Support <NUM> has a bore therethrough and may act as a mounting feature for the use to a fastener to mount the terminal <NUM>. Consequently, the support <NUM> carries the majority of any crushing forces that may be applied by the fastener and inhibits damage to the shell <NUM>. Support <NUM> may also be located and attached to the shell at a location outside of the sealing interface between the first portion 210A and the second portion 210B of shell <NUM>. Further, the components of the shell <NUM> may have interlocking features between the first portion 210A and the second portion 210B of the shell <NUM>. Specifically, portions of the terminal may have a tongue 210T and groove <NUM> construction for alignment or sealing of the device. As depicted, support <NUM> is located outside of the sealing interface of the second portion 210B of shell <NUM>.

Terminals <NUM> disclosed herein may optionally be weatherproof by appropriately sealing seams of the shell <NUM> using any suitable means such as gaskets, O-rings, adhesive, sealant, welding, overmolding or the like. To this end, terminal <NUM> or devices may also comprise a sealing element <NUM> disposed between the first portion 210A and the second portion 210B of the shell <NUM>. The sealing element <NUM> may cooperate with shell <NUM> geometry such as respective grooves <NUM> or tongues 210T in the shell <NUM>. Grooves or tongue may extend about the perimeter of the shell <NUM>. By way of explanation, grooves <NUM> may receive one or more appropriately sized O-rings or gaskets 290A for weatherproofing terminal <NUM>, but an adhesive or other material may be used in the groove <NUM>. By way of example, the O-rings are suitably sized for creating a seal between the portions of the shell <NUM>. By way of example, suitable O-rings may be a compression O-ring for maintaining a weatherproof seal. Other embodiments may use an adhesive or suitable welding of the materials for sealing the device. If welding such as ultra-sonic or induction welding of the shell is used a special sealing element <NUM> may be used as known in the art. If the terminal <NUM> is intended for indoor applications, then the weatherproofing may not be required.

To make identification of the port(s) easier for the user, a marking indicia may be used such as text or color-coding of the terminal, color codes on the actuator 310A, or marking a cable tether of an optical link (e.g. an orange or green polymer) or the like. Further, terminals may have the ports disposed in any suitable location.

<FIG> depicts a view of the second portion 210B of shell <NUM> defining a portion of cavity <NUM>. Shell <NUM> may have any suitable shape, design or configuration as desired. Second portion 210B cooperates with first portion 210A (i.e., a cover) to form shell <NUM>. Second portion 210B may comprises the input connection port <NUM>, the output connection ports <NUM>, or pass-through connection ports 260PT as desired. Second portion 210B provides a portion of cavity <NUM> of terminal <NUM>, and the internal bottom surface of second portion 210B may comprises a plurality of alignment features 210AF for aligning one or more the modular adapter sub-assembly 310SA (<FIG>) with the respective connector ports <NUM>. Alignment features 210AF may have a U-shape and cooperate with the alignment features 255AF on the bottom of adapter body <NUM>. Second portion 210B also includes a plurality of studs 210D on top of the respective connection ports <NUM> within cavity <NUM> for seating the hoop <NUM> of the adapter body <NUM> for assembly. Second portion 210B may also include a plurality of guide features 210SF for aligning the first portion 210A with the second portion 210B of the shell <NUM>.

The second portion 210B of shell <NUM> may include other features. The shell <NUM> may comprise a keying portion (not visible) in the input connection port <NUM> and/or in the connector port <NUM>. For instance, keying portion may be an additive keying portion to the primitive geometric round shape of the connection port passageway <NUM> such as a male key that is disposed forward of the securing feature in the connection port passageway <NUM>. However, the concepts for the ports may be modified for different housings <NUM> of the fiber optic conenctor <NUM> and/or the connector designs. For instance, the keying portion may be defined as a walled-portion across part of the connection port passageway so that the input connection port <NUM> or connection port <NUM> with the keying portion would be able to properly receive a housing <NUM> of an external fiber optic connector having a portion with a proper D-shape.

As shown in <FIG> the second portion 210B of shell <NUM> may comprise structure on the front end <NUM> that cooperates with mounting tab <NUM> for aligning and attaching the same to the shell <NUM> of the terminal <NUM>. In other embodiments, the mounting tab could be integrally formed with the shell <NUM>, but that requires a more complex molding process.

As shown, the connector ports of the terminal <NUM> may comprise a marking indicia such as an embossed number or text, but other marking indicia are also possible. For instance, the marking indicia may be on the securing feature <NUM> such as text on the sliding actuator or the sliding actuator(s) may be color-coded to indicate fiber count, input or output for the associated connection port or input port.

<FIG> shows an assembled view of the modular adapter sub-assembly 310SA for the connector ports <NUM> depicted in <FIG>. Modular adapter sub-assemblies 310SA enable quick and easy assembly of terminals <NUM> in a scalable manner. Moreover, the modular sub-assemblies 230SA advantageously allow the mating components (i.e., the adapters 230A) corresponding to each connection port <NUM> to move or "float" independently of other the other modular adapter sub-assemblies 310SA relative to the shell <NUM> for preserving optical performance.

<FIG> also depicts the rear connector <NUM> (internal connector of the terminal <NUM>) attached to adapter 230A in addition to modular adapter sub-assembly 310SA with a rear connector <NUM>. <FIG> depicts an exploded view of the modular adapter sub-assembly 310SA and shows that the rear connector <NUM> is not a portion of modular adapter sub-assembly 310SA. Modular adapter sub-assemblies 310SA comprises an adapter 230A aligned with the at least one connector port <NUM> when assembled. Adapter <NUM> may be biased by a resilient member 230RM.

As best shown in <FIG>, modular adapter sub-assembly 310SA comprises a portion of securing feature <NUM> and a securing feature resilient member 310RM. Specifically, modular adapter sub-assembly 310SA comprises securing member <NUM>. However, other embodiments could also comprise an actuator 310A as part of the assembly. Securing member <NUM> is inserted into a front end of an adapter body <NUM> along with securing feature resilient member 310RM. Specifically, the rim or upper portion of securing member <NUM> is inserted into a hoop <NUM> of adapter body <NUM> and standoffs 310SO are disposed in a portion of the resilient member pocket 255SP at the bottom of the adapter body <NUM>. Securing feature resilient member 310RM is disposed in the resilient member pocket 255SP for biasing the securing member <NUM> to a retain position (i.e., upward)as shown in <FIG>. This construction advantageously keeps the assembly intact using the securing feature resilient member 310RM. Standoffs 310SO of adapter body <NUM> may also act as stops to limit the translation of the securing member <NUM>.

In this embodiment, modular adapter sub-assembly 310SA may comprises an adapter body <NUM>, securing member <NUM>, securing feature resilient member 310RM, a ferrule sleeve 230FS, a ferrule sleeve retainer 230R, resilient member 230RM, a retainer along with the adapter 230A. Adapter body <NUM> has a portion of the connection port passageway <NUM> disposed therein.

As best depicted in <FIG>, the is resilient member 230RM is assembled so that is disposed over a barrel of adapter 230A and seated on the flange of adapter 230A, then retainer <NUM> can be attached to adapter body <NUM> using latch arms 240LA to secure the same. Ferrule sleeve retainer 230R and ferrule sleeve 230FS are aligned for assembly into the adapter 230A for assembly as shown and seated using the ferrule sleeve retainer 230R. Of course, other variations of the modular adapter sub-assembly 310SA are possible.

The modular sub-assemblies 310SA for the connector ports <NUM> may be assembled into the second portion 210B of shell <NUM> as depicted by <FIG>. As shown, modular adapter sub-assemblies 310AS are aligned and installed onto the U-shaped alignment features 210AF of the second portion 210B of shell <NUM>. Specifically, the alignment features 210AF of the second portion 210B of shell <NUM> cooperating with the alignment features 255AF on the bottom of adapter body <NUM> (<FIG>) to align the same with the connector ports <NUM>. Further, the hoops <NUM> of the adapter bodies <NUM> disposed about the plurality of studs 210D on top of the respective connector ports <NUM> within cavity <NUM> for aligning the modular adapter sub-assembly 310SA within the second portion 210B of shell <NUM> for aligning the connection port passageway <NUM> of the adapter body <NUM> with the connection port passageway <NUM> of the shell <NUM>.

First portion 210A of shell <NUM> may also comprises alignment features sized and shaped for cooperating with the alignment features on the top of adapter body <NUM> for securing the same when the terminal is assembled. The respective alignment features only allow assembly of the modular adapter sub-assemblies 310SA into the shell <NUM> in one orientation for the correct orientation of the locking feature <NUM> with respect to the connection port <NUM>.

The sealing member is sized for the perimeter of the actuator for sealing the securing feature passageway <NUM>. Actuator 310A may also include a stop surface that is larger than the opening in the shell <NUM> and retains the actuator 310A within the securing feature passageway <NUM> when assembled and inhibits the actuator from being removed from the terminal <NUM> when assembled.

Actuator 310A may also be a different color or have a marking indicia for identifying the port type. For instance, the actuator 310A may have a first color for connector ports <NUM> and a second color for pass-through ports, multi-fiber ports or ports for split signals. Other marking indicia schemes may be used as desired.

When an external fiber optic connector is inserted into the respective port, locking feature of the external connectors are disposed within bore 310B of securing member <NUM>. As shown in <FIG>, locking feature <NUM> is configured as ramp 310RP that runs to a short flat portion, then to a ledge for creating the retention surface 310RS for engaging and retaining the external connector (or housing <NUM>) once it is fully-inserted into the connection port passageway of the connector port <NUM>. Consequently, the securing feature <NUM> is capable of moving to an open position (OP) when inserting a suitable fiber optic connector <NUM> into the connection port passageway <NUM> since the connector housing <NUM> engages the ramp 310RP pushing the securing feature downward during insertion. However, other locking features may be used with the concepts disclosed herein.

Securing member <NUM> may also comprises standoffs <NUM> as best shown in <FIG>. Standoffs <NUM> SO cooperate with the resilient member pocket 255SP of the adapter body <NUM> for keeping the bore 310B in the proper rotational orientation within the respective to the adapter body <NUM>. Specifically, standoffs <NUM> have curved shapes that only allow the securing member <NUM> to fully-seat into the adapter body <NUM> when oriented in the proper orientation.

As best shown in <FIG>, adapter body <NUM> comprises an adapter body bore 255B that comprises a portion of the connection port passageway <NUM> when assembled. As discussed, adapter body <NUM> comprises alignment features 255AF on the bottom of adapter body <NUM> that cooperate with the shell <NUM> to align and seat the same in the shell <NUM>. Adapter body <NUM> also comprises hoop <NUM>. Hoop <NUM> captures a portion of the securing member <NUM> when assembled, and also seats the adapter body <NUM> in the second portion 210B of shell <NUM> during assembly. Adapter body <NUM> also comprises alignment features 255AFT on the top of adapter body <NUM> for securing the same in the first portion 210A of the shell <NUM> when the terminal <NUM> is assembled. Adapter body <NUM> also comprise resilient member pocket 255SP at the bottom of the adapter body <NUM> for capturing the securing feature resilient member 310RM as depicted in <FIG>.

Adapter 230A comprises a plurality of resilient arms 230RA comprising securing features (not numbered). Adapter 230A also comprises an adapter key <NUM> for orientating the adapter 230A with the adapter body <NUM>. Securing features 230SF cooperate with protrusions on the housing of rear connector <NUM> for retaining the rear connector <NUM> to the adapter 230A. The ferrule 252F is disposed within the ferrule sleeve 230FS when assembled. Ferrule sleeves 230FS are used for precision alignment of mating ferrules between internal connectors <NUM> and the external connectors. Adapters 230A are secured to an adapter body <NUM> using retainer <NUM>. Adapters 230A may be biased using a resilient member 230RM as shown. Rear connectors <NUM> may take any suitable form and be aligned for mating with the connector secured with the connection ports <NUM> in any suitable manner. Devices may use alternative rear connectors if desired and can have different structures for supporting different rear connectors.

As depicted in <FIG>, housing <NUM> of fiber optic connector <NUM> comprises an outer surface OS having a locking feature <NUM> integrally formed in the outer surface OS. Locking feature <NUM> is used for holding the connector <NUM> in the port of the terminal <NUM>. The housing <NUM> may also include a keying portion 20KP for orientating the rotational position upon insertion into the input connection port of the terminal. For instance, the keying portion 20KP may comprise a female key, but other keys may be used. The female key would cooperate with protrusion or male key disposed on the passageway of the input connection port of the terminal. Additionally, the locking feature <NUM> may be orientated relative to the keying portion <NUM> in any suitable fashion. By way of explanation, the locking feature <NUM> may be disposed about <NUM> degrees from the keying portion 20KP or the female key. Of course, other rotational orientations may be possible with the concepts disclosed. An O-ring <NUM> may be disposed on housing <NUM>. The O-ring may be disposed rearward of the locking feature <NUM> for sealing the housing <NUM> to the input connection port <NUM>.

Locking feature <NUM> of housing <NUM> may have any suitable geometry desired. For instance, the locking feature <NUM> may comprise a notch, a groove, a shoulder or a scallop as desired. As depicted, locking feature <NUM> comprises a notch integrally formed in the outer surface OS of housing <NUM>, but other structures are possible. In this instance, the notch comprises a ramp with a ledge. The ledge is formed at the forward end of the notch to form a retention force for holding the housing. However, retention surface 310RS may have different surfaces or edges that cooperate for securing the cable input device and creating the desired mechanical retention. For instance, the ledge may be canted or have a vertical wall. However, other geometries are possible such as a hole for receiving a pin on the securing feature of the terminal.

The concepts disclosed allow relatively small terminals <NUM> having a relatively high-density of connections along with an organized arrangement for connectors <NUM> attached to the terminals <NUM>. Shells have a given height H, width W and length L that define a volume for the terminal as depicted in <FIG>. By way of example, shells <NUM> of terminal <NUM> may define a volume of <NUM> cubic centimeters or less, other embodiments of shells <NUM> may define the volume of <NUM> cubic centimeters or less, other embodiments of shells <NUM> may define the volume of <NUM> cubic centimeters or less as desired. Some embodiments of terminals <NUM> comprise a connection port insert <NUM> having a port width density of at least one connection port <NUM> per <NUM> millimeters of width W of the terminal <NUM>. Other port width densities are possible such as <NUM> millimeters of width W of the terminal. Likewise, embodiments of terminals <NUM> may comprise a given density per volume of the shell <NUM> as desired.

The concepts disclosed allow relatively small form-factors for multiports as shown in Table <NUM>. Table <NUM> below compares representative dimensions, volumes, and normalized volume ratios with respect to the prior art of the shells (i.e., the housings) for multiports having <NUM>, <NUM> and <NUM> ports as examples of how compact the multiports of the present application are with respect to convention prior art multiports. Specifically, Table <NUM> compares examples of the conventional prior art multiports such as depicted in <FIG> with multiports having a linear array of ports. As depicted, the respective volumes of the conventional prior art multiports of <FIG> with the same port count are on the order of ten times larger than multiports with the same port count as disclosed herein. By way of example and not limitation, the multiport may define a volume of <NUM> cubic centimeters or less for <NUM>-ports, or even if double the size could define a volume of <NUM> cubic centimeters or less for <NUM>-ports. Multiports with smaller port counts such as <NUM>-ports could be even smaller such as the shell or multiport defining a volume of <NUM> cubic centimeters or less for <NUM>-ports, or even if double the size could define a volume of <NUM> cubic centimeters or less for <NUM>-ports. Devices with sizes that are different will have different volumes form the explanatory examples in Table <NUM> and these other variations are within the scope of the disclosure. Consequently, it is apparent the size (e.g., volume) of multiports of the present application are much smaller than the conventional prior art multiports of <FIG>. Of course, the examples of Table <NUM> are for comparison purposes and other sizes and variations of multiports may use the concepts disclosed herein as desired.

One of the reasons that the size of the multiports may be reduced in size with the concepts disclosed herein is that the cable input device and/or external connectors that cooperate with the multiports have locking features that are integrated into the housing <NUM> of the fiber optic connector <NUM>. In other words, the locking features for holding the fiber optic connector in the respective port of the terminal are integrally formed in the housing of the connector, instead of being a distinct and separate component.

In other words, fiber optic connectors <NUM> avoid bulky structures such as a coupling nut or bayonet used with conventional hardened external connectors and multiports. In other words, conventional external connectors for multiports have threaded connections or bayonets that require finger access for connection and disconnecting. By eliminating the threaded coupling nut or bayonets (which is a separate component that must rotate about the connector) the spacing between conventional connectors may be greatly reduced. Also eliminating the dedicated coupling nut from the conventional connectors also allows the footprint of the connectors to be smaller, which also aids in reducing the size of the multiports disclosed herein.

Claim 1:
A fiber optic terminal (<NUM>) comprising:
a shell (<NUM>) comprising a cavity (<NUM>), wherein the shell (<NUM>) comprises at least one input connection port (<NUM>);
at least one variable ratio coupler (VRC) having a portion disposed within the cavity (<NUM>), the at least one variable ratio coupler (VRC) comprising an optical input (OI), a first optical output (OT1), a second optical output (OT2), and a control (CTL) for changing an output power level between the first optical output (OT1) and the second optical output (OT2) at a coupling region (CR), wherein the control (CTL) is disposed within the shell (<NUM>), and wherein
a control interface (CLT INF) is disposed on the shell (<NUM>) for changing the output power level between the first optical output (OT1) and the second optical output (OT2) without entering the fiber optic terminal (<NUM>), or
the entirety of the variable ratio coupler (VRC) and its control (CTL) is sealed within the terminal (<NUM>), or
a portion of the control (CTL) is disposed external to the shell (<NUM>) for providing external access for changing the output power level between the first optical output (OT1) and the second optical output (OT2),
wherein the at least one input connection port (<NUM>) comprising a port opening (<NUM>) extending from an outer surface (<NUM>) of the terminal (<NUM>) into the cavity (<NUM>) and defining a connection port passageway (<NUM>) along a longitudinal axis configured for receiving an external optical connector and the at least one input connection port (<NUM>) being in optical communication with the optical input (OI) of the variable ratio coupler (VRC); and
a pass-through output connection port (260PT), wherein the pass-through output connection port (260PT) in optical communication with the first optical output (OT1).