Patent Description:
Recently, with the dramatic increase in different types of data services including the Internet, transmission capacity expansion of the backbone network is required. To meet the demand, one of solutions is to increase the transmission capacity of optical fibers through wavelength division multiplexing (WDM) optical communication systems that receive and transmit multiple channels of information through a single optical fiber.

In the WDM, planar lightwave circuits (PLCs) having optical waveguides on a plate of silica by a combination of optical fiber technology and large scale integration (LSI) technology are used as wavelength division multiplexers/demultiplexers. The PLC (e.g., arrayed waveguide gratings (AWGs), splitters) changes in refractive index n with the changes in temperature T, and in the case of AWGs for wavelength division, the changes in refractive index n lead to changes in the path L of light that determines the wavelength, and changes in wavelength λ occur in the channel of each output port. Hereinafter, a general AWG will be described with reference to <FIG>.

<FIG> illustrates the structure of the general AWG. As shown in <FIG>, the AWG includes an input waveguide <NUM>, an input slab waveguide <NUM>, an array waveguide <NUM>, an output slab waveguide <NUM> and an output waveguide <NUM>. Actually, there is one input waveguide <NUM> defining an optical path, but at least one input waveguide <NUM> may be included to monitor the performance in the fabrication process. An optical signal inputted to the input waveguide <NUM> is split at each wavelength λ1, λ2,. , λn and outputted to the output waveguide <NUM>. That is, when wavelength λ1 is allocated to #<NUM> channel, it is necessary that the wavelength λ1 is outputted to the output waveguide <NUM> despite changes in the surrounding environment. However, the refractive index changes with temperature, and as the refractive index changes, the wavelength of the AWG changes as well. Although the wavelength λ1 is allocated to #<NUM> channel, as the temperature changes, an error may occur, for example, wavelength λ2 may be outputted.

In the use of the AWG as a wavelength division multiplexer, to prevent the error caused by the temperature change, packaging has been used to maintain uniform temperature at high temperature above the operating temperature using a precision heater. However, due to the problems with power consumption, outdoor power supply and high temperature-induced product's short life, studies have been made on athermal AWG structures for uniformly maintaining the wavelength irrespective of the temperature of the AWG itself.

Referring to <FIG>, a cutting plane <NUM> for dividing a substrate into two parts 10a, 10b is included to compensate for temperature changes. As opposed to linear changes in wavelength at the output port with temperature, the AWG of <FIG> compensates for wavelength with the changes in temperature to prevent the changes in wavelength at the output port by allowing the first sub chip 10a including the input waveguide <NUM> to move along the cutting plane <NUM>. To move the position of the input waveguide <NUM> cut in a straight line, a material having the coefficient of thermal expansion that matches the change in wavelength is machined and used, and such a material is referred to as a temperature compensation material or a thermal compensation material and primarily includes metals having a high coefficient of thermal expansion.

The PLC that is one of optical communication components requires very precise alignment with the alignment tolerance of <NUM>. 5micrometers. Re-aligning the first sub chip 10a and the second sub chip 10b of the AWG cut to achieve temperature insensitivity within the tolerance causes a challenging technical problem.

<CIT> discloses an optical integrated circuits having a gap traversing the lens or the waveguide grating and an actuator that controllably positions the optical integrated circuit on each side of the gap. As a result, the thermal sensitivity of the optical integrated circuits, for example, arrayed waveguide gratings, is mitigated.

<CIT> discloses a method to compensate temperature dependency of center wavelength by adjusting optical input position passively by cutting the interface between the input slap waveguide of AWG and the stripe waveguide circuit connected to the input slab on a AWG chip, followed by attaching the lateral sliding rod which has the larger CTE (Coefficient of Thermal Expansion) than AWG chip substrate.

<CIT> discloses an arrayed waveguide grating, in which at least one of two slab waveguides constituting the arrayed waveguide grating is cut and separated together with a substrate on a cross separating face, a slide moving member is arranged over a waveguide forming area formed on the substrate including the separating slab waveguide and a waveguide forming area formed on the substrate including the separating slab waveguide.

<CIT> discloses an athermal arrayed wavelength grating with a temperature compensation function and a manufacturing method thereof. The athermal arrayed wavelength grating comprises a base plate, an arrayed wavelength grating chip and a temperature compensation component, wherein the base plate comprises a first base plate part and a second base plate part; the temperature compensation component enables the first base plate part and the second base plate part which form the base plate to relatively move in parallel in a plane where the base plate is located; the arrayed wavelength grating chip is cut into a first chip part and a second chip part which move relative to each other; the first chip part and the second chip part are respectively fixed on the first base plate part and the second base plate part.

The present invention as defined by claim <NUM> is directed to a temperature compensation module mounted in an arrayed waveguide grating (AWG) in which a cutting plane is aligned within the tolerance using the temperature compensation module capable of precise horizontal movement to facilitate the alignment of the cutting plane of the athermal AWG and a manufacturing method of an athermal AWG using the temperature compensation module as defined by claim <NUM>.

The present disclosure provides athermal arrayed waveguide grating (AWG) that facilitates the alignment of the cutting plane of the AWG and achieves precise horizontal movement without a change in vertical gap and difference of the cutting plane through the temperature compensation module capable of precise horizontal movement. Through this, it is possible to easily apply the thermal compensation material to both the upper and lower ends in motion, and uniformly maintain the center wavelength of the AWG device irrespective of temperature changes. Additionally, it is possible to simplify the fabrication process by simply attaching one modularized temperature compensation module to the chip, and ultimately, increase the reliability and productivity of products.

The effects that can be obtained from the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned herein will be clearly understood by those having ordinary skill in the art from the following description.

These and other advantages and features of the present disclosure and methods for achieving them will be apparent by referring to the embodiments described in detail below together with the accompanying drawings. However, the present disclosure is not limited to the following disclosed embodiments and will be embodied in many different forms, and these embodiments are only provided to make the disclosure complete and help those having ordinary skill in the technical field pertaining to the present disclosure to understand the scope of the invention fully, and the present disclosure is only defined by the scope of the appended claims.

The shape, size, proportion, angle and number shown in the drawings to describe the embodiments of the present disclosure are provided by way of illustration, and the present disclosure is not limited thereto. Additionally, in describing the present disclosure, when it is deemed that a certain detailed description of well-known related technology renders the key subject matter of the present disclosure unnecessarily ambiguous, the detailed description is omitted herein. The term 'comprises' or 'includes' as used herein does not preclude the presence or addition of other components unless 'only' is used. The singular forms as used herein include the plural forms as well unless the context clearly indicates otherwise.

In interpreting the components, unless the context clearly indicates otherwise, it is interpreted that an error range is included.

In the description of the positional relationship, for example, when the positional relationship of two components is described using 'on', 'above', 'below', 'next to', unless 'immediately' or 'directly' is used, at least one intervening component may be present.

When an element or layer is referred to as being "on" another element or layer, the element or layer may be immediately on another element or layer, or intervening element(s) or layer(s) may be present. Like reference symbols indicate like components throughout the specification.

The terms "first", "second", and the like are used to describe various components, but it is obvious that these components are not limited by the terms. These terms are used to distinguish one component from another. Accordingly, it is obvious that a first component as used herein may be a second component.

The size and thickness of each component in the drawings is shown for convenience of description, and the present disclosure is not necessarily limited to the size and thickness of the components shown in the drawings.

Each feature of the embodiments of the present disclosure may be united or combined together in part or in whole, and as sufficiently understood by those having ordinary skill in the art, a variety of technical connection and cooperation are possible, and each embodiment may be carried out independently of each other or in conjunction with each other.

The athermal AWG is cut between an input waveguide <NUM> and an input slab waveguide <NUM> or into the input slab waveguide <NUM> to compensate for changes in the center wavelength by changing the location of incoming light with the changes in temperature. To this end, the structure of a temperature compensation module for easy alignment of the cutting plane of the athermal AWG and precise horizontal movement with the expansion/contraction of a thermal compensation material is shown in <FIG> below.

<FIG> illustrates the basic structure of the temperature compensation module <NUM> according to an embodiment of the present disclosure.

Referring to <FIG>, the basic structure of the temperature compensation module <NUM> according to an embodiment of the present disclosure includes a base <NUM> and a moving member <NUM>.

The base <NUM> is attached to an AWG substrate to facilitate the alignment between the cut parts of the AWG and assist the precise horizontal movement of the cut part of the AWG with the expansion and contraction of the moving member <NUM> attached to a portion of the base <NUM>. To this end, the base <NUM> includes a first fixing part <NUM>, a second fixing part <NUM> and an elastic part <NUM> connecting the first fixing part <NUM> and the second fixing part <NUM>. According to an embodiment of the present disclosure, preferably, the base <NUM> may be integrally formed by machining such that the base <NUM> includes the first fixing part <NUM>, the second fixing part <NUM> and the elastic part <NUM> from one raw material, and is easy to machine in order to change the shape. When the base <NUM> is made of a material having a large difference in coefficient of thermal expansion from the moving member <NUM> of the thermal compensation material, it is possible to maximize the temperature compensation effect. For example, in general, the moving member <NUM> uses a metal having a high coefficient of thermal expansion. The base <NUM> may be made of, for example, metal, plastic, silicon and silica-based materials having a lower coefficient of thermal expansion. According to an embodiment of the present disclosure, the base <NUM> may be made of the same material as the AWG substrate. Through this, it is possible to prevent twists due to different coefficients of thermal expansion when the base <NUM> and the AWG substrate are attached.

The first fixing part <NUM> and the second fixing part <NUM> may be fixed and attached to the AWG. For example, an adhesive such as epoxy may be used to fix and attach the first fixing part <NUM> and the second fixing part <NUM> to the AWG chip, but fixing is not necessarily conducted only by the adhesive. Various types of members may be used to fix and attach the first fixing part <NUM> and the second fixing part <NUM> to the AWG chip. According to an embodiment of the present disclosure, the moving member <NUM> is attached to the first fixing part <NUM> to cause linear movements of the separated part of the AWG through expansion/contraction with temperature, and through this, to compensate for changes in the optical properties with temperature.

The elastic part <NUM> is formed with elasticity such that the elastic part <NUM> deforms to make linear movements as the moving member <NUM> expands/contracts, but restores to the original shape. For example, the elastic part <NUM> is in the shape of a leaf spring, and includes a support <NUM> machined in a very small thickness and a leg <NUM> connecting two ends of the support <NUM> to the first fixing part <NUM> and the second fixing part <NUM> respectively. The support <NUM> and the horizontal portion of the leg <NUM> parallel to the support <NUM> may be machined in a very small thickness such that they have the width of a few mm or less according to the required elasticity. <FIG> only shows a structure in which the leg <NUM> connects the fixing parts <NUM>, <NUM> to the support <NUM> at a right angle in the shape of '<IMG>', but this is provided by way of illustration, any shape that assists the linear movement of the fixing part with elasticity is possible. For example, the upper and lower plates (the first and second fixing parts) with the '<IMG>' shaped elastic part <NUM> connected on the left and right sides in a symmetrical structure achieve precise horizontal movements due to offset of two circular movements. At the same time, the elastic part <NUM> of vertically thick structure suppresses vertical movements, so there is almost no change in vertical difference when the upper and lower plates make horizontal movements. That is, the elastic part <NUM> may be about a few mm in thickness, thereby suppressing vertical movements.

<FIG> illustrates the alignment of the temperature compensation module <NUM> and the AWG according to an embodiment of the present disclosure.

Referring to <FIG>, when the base <NUM> of the temperature compensation module <NUM> is fixed and attached to the AWG, the first fixing part <NUM> is attached to the first sub chip 10a, and the second fixing part <NUM> is attached to the second sub chip 10b. For example, an adhesive such as epoxy may be used to fix and attach the first fixing part <NUM> and the second fixing part <NUM> to the AWG chip, but fixing is not necessarily conducted only by the adhesive. In this instance, the base <NUM> of the temperature compensation module <NUM> may be attached on or below the AWG. The cutting plane <NUM> of the AWG may be formed by cutting between the input waveguide <NUM> and the input slab waveguide <NUM>, or may be formed inside the input slab waveguide <NUM>, and accordingly, the first sub chip 10a of the AWG includes the input waveguide <NUM>, and the second sub chip 10b includes the input slab waveguide <NUM>.

The base <NUM> of the temperature compensation module <NUM> includes a hole <NUM> between the first fixing part <NUM> and the second fixing part <NUM> to allow the first fixing part <NUM> and the second fixing part <NUM> to move separately from each other. According to an embodiment of the present disclosure, the temperature compensation module <NUM> and the AWG are placed in alignment such that the cutting plane <NUM> of the AWG is included in the hole <NUM> to allow the first sub chip 10a to move separately from the second sub chip 10b. The base <NUM> may be integrally formed by machining from one raw material, and for this reason, may be a structure in which the height of the first sub chip 10a, i.e., a region including the input waveguide <NUM> accurately matches the height of the second sub chip 10b, i.e., a region including the input slab waveguide <NUM>.

For example, as shown in <FIG>, when the center line of the hole <NUM> and the cutting plane <NUM> of the AWG are placed in alignment, and the first fixing part <NUM> is fixed to the first sub chip 10a and the second fixing part <NUM> is fixed to the second sub chip 10b, the first sub chip 10a fixed to the first fixing part <NUM> horizontally moves with the expansion/contraction of the moving member <NUM> attached to the first fixing part <NUM>. In this instance, the horizontal movements are assisted by the elastic part <NUM>, and it is possible to manufacture the athermal AWG that can move within the alignment tolerance (for example, <NUM>). For example, the first and second fixing parts <IMG>with the '' shaped elastic part <NUM> connected on the left and right sides in a symmetrical structure achieve precise horizontal movements due to offset of two circular movements. Additionally, the elastic part <NUM> of vertically thick structure (for example, a few mm) suppresses vertical movements, so it is possible to achieve precise horizontal movements with almost no change in vertical difference when the upper and lower plates make horizontal movements.

According to an embodiment of the present disclosure, the step of cutting the AWG into the first sub chip 10a and the second sub chip 10b in the process of manufacturing the athermal AWG may be performed before attaching the temperature compensation module <NUM> to the AWG. However, the manufacturing process is not necessarily performed in such an order, and the athermal AWG may be manufactured in a simple manner by attaching the temperature compensation module <NUM> to the AWG and cutting the AWG such that the cutting plane <NUM> is disposed in the hole of the temperature compensation module <NUM>.

<FIG> and <FIG> illustrate the upper and lower plate structure of a first modified form of the temperature compensation module <NUM> according to an embodiment of the present disclosure.

Referring to <FIG> and <FIG>, the first modified form of the temperature compensation module <NUM> is formed with a structure in which the second fixing part <NUM> extends from the basic form of the base and two ends of the moving member <NUM> are fixed and attached to the integrally formed upper base plate <NUM>. According to an embodiment of the present disclosure, the upper base plate <NUM> may be attached on or below the AWG, and the lower base plate <NUM> may be attached to a surface opposite the upper base plate <NUM> where the AWG is attached. One end of the moving member <NUM> is fixed to the first fixing part <NUM>, and the other end is fixed to the lower base plate <NUM>. The lower base plate <NUM> may further include a guide hole <NUM> to guide the horizontal movement of the moving member <NUM>. Even though the lower base plate <NUM> is placed in contact with the ground, to prevent the expansion/contraction of the moving member <NUM> from being interrupted, the thickness of the lower base plate <NUM> may be larger than the thickness of the moving member <NUM>, and the two ends of the moving member <NUM> may be fixed to the upper base plate <NUM> and the lower base plate <NUM> respectively to prevent the contact with the ground in the guide hole <NUM>. According to another embodiment, the upper and lower base plates may be integrally formed as shown in <FIG> and <FIG>.

According to various embodiments of the present disclosure, <FIG> illustrates a variation of the first modified form of the temperature compensation module <NUM> including the upper base plate <NUM> alone. Referring to <FIG>, the moving member <NUM> may be directly fixed to the upper base plate <NUM> without separately fabricating a lower base plate of a different shape from the upper base plate <NUM>. The moving member <NUM> may be mounted in a first position ① where the two ends of the moving member <NUM> are fixed to the first fixing part <NUM> and the upper base plate <NUM> parallel to the first fixing part <NUM> respectively, or a second position ② where the two ends of the moving member <NUM> are fixed to an extension <NUM> of the first fixing part <NUM> and an extension <NUM> at the lower end of the upper base plate <NUM> respectively.

According to various embodiments of the present disclosure, <FIG> illustrate other variations of the first modified form of the temperature compensation module <NUM> including the upper base plate <NUM> alone.

Referring to <FIG>, the moving member <NUM> is directly fixed to the upper base plate <NUM> without separately fabricating a lower base plate of a different shape from the upper base plate <NUM>. Particularly, the first fixing part <NUM> and the upper base plate <NUM> may be machined with a structure for mounting the moving member <NUM> such that the two ends of the moving member <NUM> may be fixed and mounted in a recessed area of the first fixing part <NUM> and a recessed area at the lower end of the upper base plate <NUM> respectively. For example, the moving member <NUM> may be formed with a structure in which the moving member <NUM> is fixed with screws at two ends, or the moving member <NUM> itself may be fabricated in the shape of a large screw. The moving member <NUM> may be fixed to the base in a simple manner by tightening the screw, and the chip may be aligned to a desired location.

Referring to <FIG>, as shown in <FIG>, the first fixing part <NUM> and the upper base plate <NUM> may be fabricated in a linear shape as conventional without separately machining adhesion regions for the moving member <NUM>. The two ends of the moving member <NUM> may be fixed and mounted to the end of the first fixing part <NUM> and the lower end of the upper base plate <NUM> parallel thereto, respectively. In this instance, the moving member <NUM> may be a moving member <NUM> that is made of only a thermal compensation material and is attached, or a moving member <NUM>' with attaching parts of different materials connected to the two ends of the thermal compensation material. The attaching parts of different materials at the two ends of the thermal compensation material may be the same material as the first fixing part <NUM> and the upper base plate <NUM>, and may be made of metal, plastic, silicon or silica-based materials.

Referring to <FIG>, as shown in <FIG>, the first fixing part <NUM> and the upper base plate <NUM> may be fabricated in a linear shape as conventional without separately machining adhesion regions for the moving member <NUM>, but the moving member <NUM> may have a different shape. In this instance, the moving member <NUM> may include a first attaching part <NUM>-<NUM> connected to one end of the thermal compensation material for attaching with the first fixing part <NUM>, and a second attaching part <NUM>-<NUM> at the other end of the thermal compensation material for attaching to the upper base plate <NUM>. As shown in <FIG>, the second attaching part may be extended to reduce the adhesion gap with the first attaching part <NUM>-<NUM>. Due to the required minimum length for the thermal compensation material, the width of the upper base plate <NUM> may be reduced by adjusting the distance between the first attaching part <NUM>-<NUM> and the second attaching part <NUM>-<NUM> rather than forming the attaching parts at the two ends of the thermal compensation material. Through this, it is possible to fabricate the temperature compensation module <NUM> with economic efficiency. The first attaching part <NUM>-<NUM> and the second attaching part <NUM>-<NUM> may be the same material as the first fixing part <NUM> and the upper base plate <NUM>, and may be made of metal, plastic, silicon or silica-based materials.

For example, the first modified form of the temperature compensation module <NUM> is an extension integrated form, and it may be fabricated by simply cutting the planar substrate and may be a plate-type horizontal movement module that is easy to machine in order to change the shape. According to an embodiment, the base of the temperature compensation module <NUM> may be fabricated in a sufficient size to receive the entire AWG substrate, and through this, it is possible to assist the alignment and horizontal movement of the AWG substrate more precisely.

<FIG> illustrates the structure of a second modified form of the temperature compensation module <NUM> according to an embodiment of the present disclosure.

Referring to <FIG>, the second modified form of the temperature compensation module <NUM> includes an upper base plate <NUM>' that is the same as the basic form of the base, and a lower base plate <NUM>' that is fixed and attached to one surface of the second fixing part <NUM>. According to an embodiment of the present disclosure, the upper base plate <NUM>' may be attached on or below the AWG, and the lower base plate <NUM>' may be attached to a surface opposite the second fixing part <NUM> of the upper base plate <NUM>' where the AWG is attached. One end of the moving member <NUM> is fixed to the first fixing part <NUM>, and the other end is fixed to the lower base plate <NUM>'. According to another embodiment, the upper and lower base plates may be integrally formed as shown in <FIG>.

<FIG> illustrate the top and side structure of the temperature compensation module <NUM> according to an embodiment of the present disclosure.

Referring to <FIG>, the base <NUM> may further include a slit <NUM> and a dam <NUM> structure on the upper surface to assist the attachment of the AWG substrate. According to an embodiment of the present disclosure, the first fixing part <NUM> and the second fixing part <NUM> of the base <NUM> may be fixed and attached to the first sub chip 10a including the input waveguide <NUM> of the AWG and the second sub chip 10b including the slab waveguide <NUM> respectively, and in this instance, a variety of fixing methods may be used. For example, when a liquid adhesive material such as epoxy is used, it is necessary to prevent the liquid adhesive material from flowing in regions other than the first fixing part <NUM> and the second fixing part <NUM>. It is to prevent the problem that the elastic part <NUM> cannot perform the intrinsic function when attached to the AWG. To this end, as shown in <FIG> and <FIG>, the slit <NUM> and the dam <NUM> structure may be included on the upper surface of the base <NUM> to prevent the liquid adhesive material from flowing. The present disclosure does not necessarily include the slit <NUM> and the dam <NUM> structure, and the same goal may be achieved by precisely applying the adhesive material. Referring to <FIG>, a slit <NUM> structure may be included on the lower surface of the base <NUM>, and the lower base plate <NUM>, <NUM>' structure may be attached to prevent the liquid adhesive material from flowing.

<FIG> illustrate examples of the AWGs with the temperature compensation modules <NUM> of various structures according to an embodiment of the present disclosure.

Referring to <FIG>, the AWG with the basic form of the temperature compensation module <NUM> is shown. The first fixing part <NUM> of the base <NUM> is fixed to the first sub chip 10a of the AWG, and the second fixing part <NUM> is fixed to the second sub chip 10b of the AWG. The cutting plane <NUM> of the AWG for cutting into the two parts 10a, 10b is disposed in the hole <NUM> of the base <NUM> so that the first sub chip 10a is horizontally moved along the cutting plane <NUM> by the moving member <NUM> made of the thermal compensation material. Through this, the AWG with the basic form of the temperature compensation module <NUM> compensates for changes in the center wavelength with the changes in temperature, thereby achieving the athermal AWG.

Referring to <FIG>, the AWG with the first modified form of the temperature compensation module <NUM> is shown. The first fixing part <NUM> of the upper base plate <NUM> is fixed to the first sub chip 10a of the AWG, and the second fixing part <NUM> is fixed to the second sub chip 10b of the AWG. The cutting plane <NUM> of the AWG for cutting into the two parts 10a, 10b is disposed in the hole <NUM> of the upper base plate <NUM> so that the first sub chip 10a is horizontally moved along the cutting plane <NUM> by the moving member <NUM> made of the thermal compensation material. As shown in <FIG>, the moving member <NUM> may be disposed in the guide hole <NUM> to achieve linear expansion/contraction without interruption.

Referring to <FIG>, the AWG with the second modified form of the temperature compensation module <NUM> is shown. The first fixing part <NUM> of the upper base plate <NUM>' is fixed to the first sub chip 10a of the AWG, and the second fixing part <NUM> is fixed to the second sub chip 10b of the AWG. The cutting plane <NUM> of the AWG for cutting into the two parts 10a, 10b is disposed in the hole <NUM> of the upper base plate <NUM>' so that the first sub chip 10a is horizontally moved along the cutting plane <NUM> by the moving member <NUM> made of the thermal compensation material.

According to an embodiment of the present disclosure, the temperature compensation module <NUM> of <FIG> is an extension integrated form, and it may be fabricated by simply cutting the planar substrate and may be a plate-type horizontal movement module that is easy to machine in order to change the shape. According to an embodiment, the base of the temperature compensation module <NUM> may be fabricated in a sufficient size to receive the entire AWG substrate, and through this, it is possible to assist the alignment and horizontal movement of the AWG substrate more precisely. In this instance, for example, the moving member <NUM> may be formed with a structure in which the moving member <NUM> is fixed with screws at two ends, or the moving member <NUM> itself may be fabricated in the shape of a large screw. Through the screw shape of the moving member <NUM>, the moving member <NUM> may be fixed to the base in a simple manner, and the chip may be aligned to a desired location by adjusting the screw.

In the specific embodiments described above, the components included in the present disclosure are represented in singular or plural forms according to the presented specific embodiments. However, the singular or plural forms are selected suitably for the presented context for convenience of description, and the above-described embodiments are not limited to the components in singular or plural forms, and the component represented in plural form may be singular and the component in singular form may be plural.

Claim 1:
A temperature compensation module (<NUM>) mounted in arrayed waveguide grating (AWG) to manually compensate for outside temperature changes, the temperature compensation module (<NUM>) comprising:
a base (<NUM>) that is attached to the AWG; and
a moving member (<NUM>) that is attached to the base (<NUM>),
wherein the base (<NUM>) includes:
a first fixing part (<NUM>) that is attached to a first sub chip (10a) including an input waveguide of the AWG;
a second fixing part (<NUM>) that is attached to a second sub chip (10b) including an input slab waveguide of the AWG;
a hole (<NUM>) being a gap between the first fixing part (<NUM>) and the second fixing part (<NUM>), the hole (<NUM>) disposed to include a cutting plane (<NUM>) within the gap, the cutting plane (<NUM>) for separating the AWG into the first sub chip (10a) and the second sub chip (10b); and
an elastic part (<NUM>) to assist a linear movement of the first fixing part (<NUM>) and connect the first fixing part (<NUM>) and the second fixing part (<NUM>), characterized in,
the elastic part (<NUM>) is in a shape of a leaf spring and includes a support (<NUM>) and a leg (<NUM>) connecting two ends of the support (<NUM>) to the first fixing part (<NUM>) and the second fixing part (<NUM>), respectively, and a horizontal portion of the leg (<NUM>) is parallel to the support (<NUM>), and a vertical structure of the elastic part (<NUM>) suppresses vertical movements, and
the moving member (<NUM>) is attached to the first fixing part (<NUM>) to horizontally move the first sub chip (10a) of the AWG along the cutting plane (<NUM>) by the moving member (<NUM>) made of a thermal compensation material, thereby arranged for reducing a change in center wavelength with a change in temperature.