Patent Publication Number: US-2021165170-A1

Title: Waterproof fiber optic connector assembly and method of use

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This Application is a continuation of U.S. patent application Ser. No. 16/844,744 filed Apr. 9, 2020 tilted “Waterproof Fiber Optic Adapter Assembly And Method of Use”, which is a continuation of U.S. patent application Ser. No. 16/283,161 filed Feb. 22, 2019 now U.S. Pat. No. 10,732,359 issued Aug. 4, 2020, titled “Waterproof Fiber Optic Adapter Assembly for Sealing a Fiber Optic Connector Against Moisture Ingress”, which claims priority to U.S. Patent Application 62/644,011 filed Mar. 16, 2018, title “Waterproof Connector and Adapter System”, and of the above are included by reference into the present application. 
    
    
     BACKGROUND 
     The present disclosure relates generally to fiber optic connectors, and more specifically to fiber optical connector and adapters having a waterproof seal to prevent moisture ingress. 
     The prevalence of the Internet has led to unprecedented growth in communication networks. Consumer demand for service and increased competition has caused network providers to continuously find ways to improve quality of service while reducing cost. 
     Certain solutions have included deployment of high-density interconnect panels. High-density interconnect panels may be designed to consolidate the increasing volume of interconnections necessary to support data networks in a compacted form factor, thereby increasing quality of service and decreasing costs such as floor space and support overhead. However, the deployment of high-density interconnect panels have not been fully realized. The computer rooms need to be cooled to keep humidity levels low to prevent moisture build up that interferes with signal quality. 
     Outside of the environmental controlled data center, the use of fiber optic connectors and adapters are subject to wide varying conditions from rain, high humidity, and costal salt air. These devices are used underground, in basements, cellars and telephone poles where moisture stays for months and months without drying out. Upon a connector or adapter failure, access is difficult and it is time consuming to determine which connector/adapter system unit failed. 
     SUMMARY 
     Embodiments disclosed herein address the aforementioned shortcomings by providing optical fiber connectors and adapters that have an effective and low cost sealing components without compromising the essential features of a small form factor or meeting industry standard dimensions and performance requirements. 
     In summary, the present disclosure provides an optical fiber connector with sealing components that substantially prevents moisture ingress into the ferrule tip or fiber optic communication path. The connector has a polymer/rubber seal that is also a heat shrinkable tube with an adhesive inside lining that covers a back portion of the connector plug frame, crimp ring, back body and spring including a portion of a boot that accepts a cable having fiber. The adapter comprises an alignment sleeve that accepts a rubber/polymer gasket that is compressed by a proximal end of the connector plug frame or similar structure to form a moisture seal. 
     The present disclosure also provides a rubber seal washer that is formed to fit against the adapter flange face. Upon securing the adapter against a module face plate that holds an array of adapters, the washer is compressed and seals out moisture and other debris. 
     Further presented herein is a system having both an optical fiber connector and an optical fiber adapter with sealing components to prevent moisture ingress via the connector or adapter into the fiber optic communication path. 
     The foregoing, as well as additional objects, features and advantages of the present disclosure will be more apparent from the following detailed description, which proceeds with reference to the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  is a perspective view of a standard fiber optic connector prior to insertion into a standard adapter. 
         FIG. 1B  is a perspective view of a standard fiber optic connector inserted into a standard adapter. 
         FIG. 2A  is a bottom view of  FIG. 1B , with a cross section at B-B. 
         FIG. 2B  is cross-section B-B showing a representative moisture path (along dotted line) into a cavity containing a ferrule having an optical fiber forming a fiber optic signal path with an opposing optical fiber (not shown). 
         FIG. 3  is a cutout view along a X-Y axis of the connector inserted into an adapter just prior to compressing a seal according to the present invention. 
         FIG. 4A  is a cross-section cut away along a X-Y axis of the connector inserted into the adapter and the proximal end of a connector plug frame or leading surface of the connector tip is compressing a seal according to the present invention. 
         FIG. 4B  is a cross-section cut away along a X-Y axis, similar to  FIG. 4A , where connector is fully seated with seal, 
         FIG. 5  is a perspective view of a seal according to the present invention. 
         FIG. 6  is a front view of the seal of  FIG. 5 . 
         FIG. 7  is a side view of  FIG. 5 . 
         FIG. 8  is the rear view of  FIG. 5 . 
         FIG. 9  is a perspective view of  FIG. 8 . 
         FIG. 10A  is an exploded view of an adapter of the present invention. 
         FIG. 10B  is an assembled view of an adapter of the present invention. 
         FIG. 11A  is a bottom view of an adapter illustrating a moisture path of the present invention. 
         FIG. 11B  is a cross-section A-A of  FIG. 11A  illustrating a moisture path of the present invention. 
         FIG. 12A . 1  is a perspective exploded view of an adapter with sleeve seals. 
         FIG. 12A . 2  is a partial exploded view of an adapter further showing cross-sections A-A and B-B, according to the present invention. 
         FIG. 12B  is a cross-section view A-A prior to the installing the seal over an alignment sleeve holder. 
         FIG. 12C  is cross section view B-B after a seal washer is installed over an alignment sleeve holder, according to the present invention. 
         FIG. 13A . 1  is a perspective, exploded view of an adapter according to the present invention with a washer-seal just prior to placement at a face of an adapter flange according to the present invention. 
         FIG. 13A . 2  is side view of  FIG. 13A . 1 . 
         FIG. 13B  depicts cut-away point C-C of the washer-seal secured up against the face of the flange of the adapter of  FIG. 13A . 
         FIG. 13C  is section C-C view showing a distance of washer-seal compression after insertion of connector within adapter receptacle. 
         FIG. 14A  is a perspective view of an adapter according to the present invention secured to a module face plate. 
         FIG. 14B  is a perspective view of an adapter on each side of a module face with an edged connector tip call out just prior to insertion in adapter receptacle according to another embodiment of the invention. 
         FIG. 14C  is a zoomed view of the edged connector tip and connector tip bore. 
         FIG. 14D  is an exploded view of  FIG. 5  seal prior to accepting edge connector tip of  FIG. 14C , as assembled in  FIGS. 3-4 . 
         FIG. 15A  is a perspective view of the edged connector tip connector inserted into an adapter receptacle according to the present invention. 
         FIG. 15B  is a cross section D-D of  FIG. 15A . 
         FIG. 15C  is a zoomed view of  FIG. 15B . 
         FIG. 16A  is an exploded view of a fiber optic connector according to another embodiment of the present invention. 
         FIG. 16B . 1  is a perspective view of an edged tip connector of  FIG. 16A  with a heat shrink tubing attached just prior to securing a boot. 
         FIG. 16B . 2  is  FIG. 16A  with the tubing shrunk. 
         FIG. 16B . 3  is a perspective of boot secured to the heat shrink tubing, of  FIG. 16B . 2 . 
         FIG. 17A  is a side view of an edged tip connector partially assembled illustrating the tubing and boot prior to assembly. 
         FIG. 17B  is the section A-A perspective view of  FIG. 17A . 
         FIG. 18  is the call-out detail “B” of  FIG. 17B  showing a moisture path through an assembled connector. 
         FIG. 19A  is a side view of the connector of  FIG. 18  with a heat shrink tubing attached according to the present invention. 
         FIG. 19B  is a section view A-A of  FIG. 19A , illustrating the adhesive inner lining covering moisture ingress points. 
         FIG. 19C  is call-out detail “B” of  FIG. 19B . 
         FIG. 20A  is an exploded view of the connector of  FIG. 16  according to the present invention. 
         FIG. 20B . 1  is a perspective view of the connector of  FIG. 20A  with a heat shrink tube attached prior to securing a boot. 
         FIG. 20B . 2  is a perspective view of  FIG. 20B . 1  with heat shrink tubing secured after heating. 
         FIG. 20B . 3  is a perspective view of  FIG. 20B . 2  with the boot secured over the back body. 
         FIG. 21A  is a partially exploded view of another connector embodiment showing a rubber washer seal prior to insertion onto a back-post. 
         FIG. 21B  is  FIG. 21A  with the rubber washer installed onto a back-post. 
         FIG. 21C  is shows cut-line “A-A” of  FIG. 21B  assembled. 
         FIG. 21D  is a cross section view “A-A” of the rubber washer of  FIG. 21B  assembled as a connector with the washer compressed. 
         FIG. 22A  is a side view of the heat shrink tubing prior to heating and securing over the connector distal end. 
         FIG. 22B  is a perspective view of the heat shrink tubing shrunk and cut-line “B-B”. 
         FIG. 22C  is a cross section “B-B” of the heat shrink tubing heated and secured over the connector distal end of  FIG. 22A , and a back-post secured into a back body compressing the washer. 
         FIG. 23A  is a perspective view of a prior art fiber optic connector. 
         FIG. 23B  is a perspective view of a prior art fiber optic connector. 
         FIG. 23C  is a perspective view of a prior art fiber optic connector. 
         FIG. 23D  is a perspective view of a prior art fiber optic connector. 
         FIG. 23E  is a perspective view of a prior art fiber optic connector. 
         FIG. 24A  is a perspective view of prior art fiber optic adapter. 
         FIG. 24B  is a perspective view of prior art fiber optic adapter. 
         FIG. 24C  is a perspective view of prior art fiber optic adapter. 
         FIG. 24D  is a perspective view of prior art fiber optic adapter. 
         FIG. 24E  is a perspective view of prior art fiber optic adapter. 
     
    
    
     DETAILED DESCRIPTION 
     This disclosure is not limited to the particular systems, devices and methods described, as these may vary. The terminology used in the description is for the purpose of describing the particular versions or embodiments only and is not intended to limit the scope. 
     As used in this document, the singular forms “a,” “an,” and “the” include plural references unless the context clearly dictates otherwise. Unless defined otherwise, all technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art. Nothing in this disclosure is to be construed as an admission that the embodiments described in this disclosure are not entitled to antedate such disclosure by virtue of prior invention. As used in this document, the term “comprising” means “including, but not limited to.” 
     The following terms shall have, for the purposes of this application, the respective meanings set forth below. 
     A “connector,” as used herein, refers to a device and/or components thereof that connects a first module or cable to a second module or cable. The connector may be configured for fiber optic transmission or electrical signal transmission. The connector may be any suitable type now known or later developed, such as, for example, a ferrule connector (FC), a fiber distributed data interface (FDDI) connector, an LC connector, a mechanical transfer (MT) connector, a square connector (SC) connector, an SC duplex connector, or a straight tip (ST) connector. The connector may generally be defined by a connector housing body. In some embodiments, the housing body may incorporate any or all of the components described herein. 
     A “fiber optic cable” or an “optical cable” refers to a cable containing one or more optical fibers for conducting optical signals in beams of light. The optical fibers can be constructed from any suitable transparent material, including glass, fiberglass, and plastic. The cable can include a jacket or sheathing material surrounding the optical fibers. In addition, the cable can be connected to a connector on one end or on both ends of the cable. 
     The terminal ends of a cable may include a connector used to connect the cable with another cable or other fiber optic devices. A connector may include a housing structure configured to interact with and connect with an adapter. An adapter, among other things, may include two aligned ports that align fiber optic connectors and/or electrical connectors therein. The adapter may be used, for example and without limitation, to align and connect optical fibers end-to-end or to allow for pin/socket electrical connections. 
     Referring to  FIGS. 1A and 1B , standard fiber optic connector ( 10 ) with plug frame ( 12 ) is shown prior to insertion into standard adapter ( 20 ). The plug frame ( 12 ) holds ferrule ( 13 ) with a fiber optic signal path (not shown). In  FIG. 1B , standard connector ( 10 ) is inserted into adapter ( 20 ), called a connector and adapter system ( 30 ). Referring to  FIG. 2A , connector and adapter system ( 30 ) is shown from a bottom view, with a cut-line B-B.  FIG. 2B  is a cross-section view along B-B of  FIG. 2A .  FIG. 2B  illustrates a possible moisture path ( 40 ) where moisture and debris, likely in the form of humidity and suspended particles, ingresses into a space ( 42 ) of plug frame ( 12 ) and other assembled components therein such as ferrule ( 13 ) of connector ( 10 ) (refer to  FIG. 1A .) This moisture suspension then condenses onto the fiber optics and interferes with the light signal. It is known in the art that light is bent and distorted as it moves through air and fiber due to the refractive index of the media. Humid air with suspended particles has a bends light and distorts a light signal exiting an optical fiber from a first ferrule prior to entrance into a second optic fiber. Fiber optic cables comprising optical fiber, coating, cladding and cable jacket are designed for with a specific numerical aperture. If this aperture is distorted by moisture or debris, then a significant loss of optical signal can occur. Since the optical signal contains data or information in the form of wavelengths of light, the loss of light means loss of data. 
     Referring to  FIG. 3 , a cross section of a connector ( 310 ) is shown inserted into adapter ( 320 ) of the present invention. Unlike adapter ( 20 ), adapter ( 320 ) further comprises sleeve seal ( 570 ) positioned circumferential around alignment sleeve holder ( 352 ). Sleeve seal ( 570 ) abuts a back wall of the adapter. This provides a sealing surface ( 351 ) that helps prevent moisture and debris ingress. Proximal end ( 354 ) of edged connector ( 310 ) tip ( 353 ) mates and compresses sleeve seal surface ( 574 ), as illustrated in  FIG. 4A . Distal end ( 355 ) of the edged connector ( 310 ) provides a surface to apply heat shrink tubing ( 1695 ) to provide improve moisture sealing as described in  FIG. 17A  below. Still referring to  FIG. 3 , a cable containing the optical fibers is inserted at opening ( 357 ), or a distal end of the edged connector ( 310 ). Adapter flange ( 356 ) provides another sealing surface as described herein at  FIG. 3 , to prevent further moisture and debris ingress as described at  FIGS. 11 and 11A . 
     Referring to  FIG. 4A , edged connector tip ( 353 ) has sealing faces ( 353   b ) and ( 353   c ) configured to mate with sleeve seal surface ( 574 ) to help prevent moisture and debris ingress into space or cavity ( 42 ) (refer to  FIG. 2B ). In this 
       FIG. 4A , the edged connector tip is compressing the sleeve seal to form a seal against moisture and debris ingress. Referring to  FIG. 4B , sleeve seal ( 570 ) is retained on an alignment sleeve cutout ( 355   a ). Cutout ( 355   a ) is configured to accept sleeve seal ( 570 ) corresponding to a connector type such as MPO, CS, SN, SC or LC. The connectors are depicted in  FIGS. 23A-23E  and the corresponding adapters are depicted in  FIGS. 24A-24E . 
     Referring to  FIG. 5  through  FIG. 9 , various views of the sleeve seal are shown. In  FIG. 5 , sleeve seal ( 570 ) includes sealing surface ( 574 ) configure to mate with edged connector tip ( 353 ). Sealing surface ( 574 ) may be configured to mate with a MPO (“multi fiber push on”) edged connector tip rather than the edged connector tip of a LC “Lucent Connector” type, as disclosed in the present invention. Sleeve ( 570 ) includes bore ( 578 ) that is sized and shaped to go over an outer circumference of alignment sleeve ( 352 ), with sleeve bore ( 578 ) inner diameter sized to create a seal with the outer diameter of the alignment sleeve ( 352 ). An outer flange ( 572 ) is sized to provide an additional sealing surface with an alignment sleeve back plate, and flange ( 572 ) rests in alignment sleeve cut-out ( 353   a ). Sleeve seal face ( 576 ) (also called primary face seal) is sized to fit into a circumferential opening, or a bore ( 1420 ) at a proximal end of edged connector tip ( 1410 ) (refer to FIG.  14 D) to provide an additional seal against moisture or debris ingress into cavity ( 42 ) containing the ferrule and fiber optic signal path. Referring to  FIG. 6 , flange ( 572 ) first face ( 572   b ) and second face ( 572   c ) are configured to engage edged connector tip surfaces ( 353   b,    353   c ) (refer to  FIG. 4A ) to form a seal. 
     Referring to  FIG. 7 , side view of the sleeve seal ( 570 ) shows flange ( 572 ) is sized to provide lateral strength, which sleeve seal surface ( 574 ) is configured to compress to flange ( 572 ) and mate with edged connector tip ( 353 ) to form a seal. Referring to  FIG. 8 , back face ( 572   d ) of flange ( 572 ) provides an additional sealing surface that mates with back-plate ( 23   b ) of alignment sleeve holder ( 23 ) (refer to  FIG. 11B ).  FIG. 9  is a back face ( 572   d ), side view of sleeve seal ( 570 ) illustrating the inner diameter is sized and configured, with possible striations ( 572   e ) to seal up against the outer diameter of the alignment sleeve ( 23 ). 
     Referring to  FIG. 10A  and  FIG. 10B , a standard adapter is shown in an exploded view and assembled view respectively. Adapter housing ( 21 ) contains alignment sleeve back-plate ( 23   b ), alignment sleeve holder ( 23 ), alignment sleeves ( 25 ), base plate ( 29 ) and base screws ( 27 ).  FIG. 10B  depicts  FIG. 10A  adapter ( 20 ) assembled. Referring to  FIGS. 11A and 11B ,  FIG. 11B  is the cross section A-A of  FIG. 11A , a standard adapter similar to  FIG. 10B , where  FIG. 11B  illustrates the likely moisture path ( 22   a ) around and through the alignment sleeve back-plate ( 23   b ).  FIG. 11A  depicts a moisture path ( 22 ) between panel and adapter ( 20 ) flange. Adapter ( 20 ) is mounted to a panel front plate ( 21 ). 
     Referring to  FIGS. 12A . 1 ,  12 A. 2 ,  12 B and  12 C, an embodiment of the present invention illustrates inserting sleeve seal ( 570 ) over the alignment sleeve holder ( 23 ) along the cross section A-A of  FIG. 12A . 2  at  FIG. 12B .  FIG. 12C  is inserted sleeve seal ( 570 ) over alignment sleeve holder ( 23 ) along cross section B-B of  FIG. 12A . 2  at  FIG. 12C . Seal ( 570 ) is shown prior to insertion at  FIG. 12B  and inserted over alignment sleeve holder ( 23 ) at  FIG. 12C .  FIG. 12A . 1  depicts adapter ( 320 ) with sleeve seal ( 570 ) in an exploded view. 
     Referring to  FIGS. 13A-C , another embodiment of the adapter is shown. Seal washer ( 28 ) is inserted over the outer surface of adapter ( 320 ) and against the adapter flange, as shown in  FIGS. 13A . 1  and  13 A. 2 .  FIG. 13B  is a cross section along C-C of  FIG. 13A , and  FIG. 13C  shows washer ( 28 ) compression distance ( 28   b ) against the flange face when the adapter is secured to a module face plate as shown in  FIG. 14A . Washer ( 28 ) is shown on one side of adapter ( 320 ), but may be placed on both sides of adapter ( 320 ) without departing from the scope of the present invention, at  FIG. 14B .  FIG. 14B  shows edged connector tip ( 1410 ) around the tip of the connector. Edged connector tip ( 1410 ) mates with sleeve seal ( 570 ) (not shown) that is sized and shaped to fit into bore ( 1420 ) to provide an additional moisture seal.  FIG. 14C  is a zoomed view of edged connector tip ( 1410 ) and bore ( 1420 ) or circumferential opening. Edged connector tip ( 1410 ) may be a cylindrical extension of plug frame ( 12 ), or formed as part of proximal end of plug frame ( 12 ). Bore ( 1420 ) accepts primary flange face ( 576 ), and as connector is inserted further into adapter ( 320 ) (as depicted in  FIG. 15B  and  FIG. 15C ), edged connector tip ( 1410 ) accepts sleeve flange ( 576 ) along sealing surface ( 574 ) until connector edged tip ( 1410 ) abuts second surface ( 572   c ). 
       FIG. 14D  depicts seal ( 570 ) prior to placement within bore ( 1420 ) and abutting edge connector tip face ( 1410   a ) to seal fiber optic connector ( 1400 ) at proximal end or ferrule end. Dotted lines depicts second surface ( 572   c ) abutting face ( 1410   a ) and sealing surface ( 574 ) within bore ( 1420 ) , when connector ( 1400 ) is fully inserted into an adapter ( 320 ) or similarly configured adapter of  FIG. 24 . 
     Referring to  FIGS. 15A-C , the connector ( 1400 ) with sleeve seal ( 570 ),  FIG. 12B , is shown inserted into adapter ( 320 ) at  FIG. 15A .  FIG. 15B  section D-D of  FIG. 15A  shows edged connector tip ( 1410 ) compressing the sleeve seal ( 570 ). The zoomed view  FIG. 15C  of edged connector tip ( 1410 ) and adapter ( 320 ) with sleeve seal ( 570 ) more closely shows the compression of seal ( 570 ) by edged connector tip ( 1410 ), and seal ( 570 ) partially enters edged connector tip bore ( 1420 ). The ingress of the seal helps seal, within bore tip, against moisture and debris entering the space ( 42 ) as shown in  FIG. 2B . Cylindrical edged connector tip ( 1410 ) compressed seal ( 570 ) up against inner structure of adapter receptacle providing a moisture or debris seal. 
     Referring to  FIG. 16A , an exploded view of the connector ( 1400 ) is shown. In this embodiment, heat shrink tube ( 1695 ) is placed partially over distal end ( 1690   b ) of plug frame ( 1690 ) and partially over proximal end  1696   b  of boot ( 1696 ). Tubing ( 1695 ) covers and protects ferrule flange ( 1691 ), spring ( 1692 ), back-post ( 1693 ) and crimp ring  1694  from moisture ingress. Tubing ( 1695 ) may cover less connector components without departing from the scope of the invention. Referring to 
       FIGS. 16B . 1 - 16 B. 3 , at  FIG. 16B . 1  tubing ( 1695 ) positioned over the distal end of plug frame ( 1690 ) prior to applying heat. Referring to  FIG. 16B . 2 , the tubing was heated and shrunk forming a seal about the crimp ring, which provides sealing surface ( 1694   b ) for boot ( 1696 ). Referring to  FIG. 16B . 3 , boot ( 1696 ) is inserted over surface ( 1694   b ), and reheated to form a seal with the boot and resulting in connector ( 1600 ). 
     Referring to  FIG. 17A , heat shrink tubing ( 1695 ) is shown prior to insertion over the crimp ring and plug frame ( 1690 ) and strain relief or boot ( 1696 ), shrink tubing overlaps a distance ( 1690   c ). Referring to  FIG. 17B , cross section A-A, illustrates the components being sealed by heat shrink tubing ( 1695 ). 
     Referring to  FIG. 18 , detail B is a zoomed view showing moisture paths ( 1840 ) that heat shrink tubing ( 1695 ) forms a protective seal against moisture and debris. Moisture can enter between back-post ( 1693 ) and crimp ring ( 1694 ). Moisture can enter between connector body ( 1690   b ) and back-post ( 1693 ). Referring to  FIG. 19A , the heat shrink tubing ( 1695 ) has been heated and shrunk.  FIG. 19B  is cross section A-A showing the heat shrunk tubing and boot ( 1696 ), the latter prior to insertion over the distal end of the connector.  FIG. 19C  is a zoomed view of  FIG. 19B  (i.e. Detail B), and the lower illustration is detail B, showing the heat shrink tubing ( 1695 ) applied to the connector. With added adhesive on the inside of the tubing, substantially all moisture paths are sealed. 
     Referring to  FIG. 20A , another embodiment of a connector using heat shrink tubing ( 1695 ) is shown. This discloses an alternative back-post ( 1693 ) and crimp ring ( 1694 ), which does not change the scope of the present invention using the tubing ( 1695 ) to seal moisture/debris paths. In this embodiment, seal ( 1699 ) is added to back-post ( 1693 ), at a proximal end thereof, for additional sealing. Referring to  FIGS. 20B . 1  to  20 B. 3 ,  FIG. 20B . 1  illustrates heat shrink tubing ( 1695 ) prior to heating over the back-post.  FIG. 20B . 2  illustrates heat shrink tubing ( 1695 ) heated onto back-post.  FIG. 20B . 3  illustrates boot ( 1696 ) applied over the heat shrink tubing. Comparing with  FIGS. 16B . 1 - 16 B. 3  and  FIGS. 19A and 19B , the positioning of the heat shrink tubing over the back-post, back body or differing back-posts does not depart from the scope of the invention to prevent moisture ingress as depicted in  FIG. 18 . 
     Referring to  FIG. 21A , is an exploded view of back-post ( 1693 ) and rubber washer seal ( 1699 ) prior to assembly to connector body ( 1690 ). Referring to  FIG. 21B , washer seal ( 1699 ) is inserted onto back-post ( 1693 ). Referring to  FIG. 21C , washer and back-post are inserted into a distal opening of connector body ( 1690 ), with washer ( 1699 ) positioned and compressed within connector body ( 1690 ).  FIG. 21D  is a cross section “A-A”, of  FIG. 21C , illustrates washer ( 1699 ) is compressed by back-post ( 1693 ) upon final assembly. Back-post cut-out ( 1693   b ) is captured and secured within corresponding protrusion ( 1690   d ) located at a distal end inside of connector body ( 1690 ). 
     Referring to  FIG. 22A , heat shrink tubing ( 1695 ) is positioned over the distal end of the plug frame, and shrunk as shown in  FIG. 22C  (Section B-B) sealing moisture paths as shown in  FIG. 18 . Heat shrink tubing is made from an adhesive lined polyolefin jacket.  FIG. 22B  shows tubing ( 1695 ) heated and shrunk over the back body and cabling of the connector assembly.  FIG. 22C  depicts heat shrink tubing ( 1695 ) over back-post ( 1693 ). 
       FIGS. 23A-23E  depicts standard fiber optic connectors accepted within fiber optic adapter.  FIG. 23A  depicts a SC connector ( 200 ) is accepted by adapter ( 300 )  FIG. 23B  depicts a duplex LC connector ( 225 ) are accepted by adapter ( 325 ).  FIG. 23C  depicts a MPO connector ( 230 ) is accepted by adapter ( 330 ).  FIG. 23D  depicts a CS® connector ( 235 ) is accepted by adapter ( 335 ) with a hook therein, and  FIG. 23E  depicts a SN® connector ( 240 ) is accepted by adapter ( 340 ) with a latch therein. CS and SN are trademarks of the current assignee of this patent. The trademark names are for reference only. 
       FIGS. 24A-24E  depict adapters that can use the present invention of adapter ( 320 ) incorporating seal ( 570 ).  FIG. 24A  depicts a SC adapter ( 300 ) can accept SC connector ( 200 ).  FIG. 24B  depicts a LC adapter ( 325 ) can accept, one or more LC connectors ( 225 ).  FIG. 24C  depicts a CS MPO adapter ( 330 ) can accept a MPG connector ( 230 ).  FIG. 24D  depicts a CS adapter ( 335 ) can accept a CS Connector ( 235 ).  FIG. 24E  depicts a SN adapter ( 340 ) can accept a SN connector ( 240 ). 
     In the above detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, similar symbols typically identify similar components, unless context dictates otherwise. The illustrative embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be used, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein. It will be readily understood that the aspects of the present disclosure, as generally described herein, and illustrated in the Figures, can be arranged, substituted, combined, separated, and designed in a wide variety of different configurations, all of which are explicitly contemplated herein. 
     With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity. 
     It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (for example, bodies of the appended claims) are generally intended as “open” terms (for example, the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” et cetera). While various compositions, methods, and devices are described in terms of “comprising” various components or steps (interpreted as meaning “including, but not limited to”), the compositions, methods, and devices can also “consist essentially of” or “consist of” the various components and steps, and such terminology should be interpreted as defining essentially closed-member groups.