KR101587638B1 - wavelength division optical module and home network system using the same - Google Patents

Abstract

The present invention relates to a wavelength division multiplexed optical module and a home network system using the same, wherein a core layer for guiding light to a substrate is formed in an upper clad layer and a lower clad layer, wherein the core layer includes at least a linearly- Two or more transverse waveguides and at least two or more longitudinal waveguides formed so as to extend in a straight line along a direction orthogonal to the extending direction of the transverse waveguides so as to become a pattern arranged in a zigzag pattern along with the transverse waveguides The optical waveguide structure includes a planar optical waveguide structure formed at a position where the longitudinal waveguide and the longitudinal waveguide are in contact with each other to form a zigzag waveguide waveguide, The light of a wavelength follows a zig-zag waveguide along the direction perpendicular to the incident direction. And a plurality of wavelength filters and a plurality of terminals formed on the waveguide core layer to transmit the light that has passed through the wavelength filter on a planar optical waveguide structure for reflection. According to the wavelength division multiplexed optical module and the home network system using the wavelength division multiplexed optical module, the efficiency of integration due to the channel expansion for separating and receiving multiplexed optical signals for each channel and transmitting or receiving the multiplexed optical signals can be increased.

Description

[0001] The present invention relates to a wavelength division multiplexing optical module and a home network system using the wavelength division multiplexing optical module,

[0001] The present invention relates to a wavelength division multiplexed optical module and a home network system using the same, and more particularly, to a wavelength division multiplexed optical module capable of separating optical signals according to wavelength bands and providing them as mutually different channels, Module and a home network system using the same.

2. Description of the Related Art In a wavelength division multiplexing (WDM) optical network generally used for transmitting a large amount of information, an optical signal composed of multiple channels is transmitted through a single optical fiber.

In such a wavelength division multiplexing optical network, a wavelength division multiplexer / demultiplexer for separating and receiving an optical signal for each channel from a multiplexed signal into an electrical signal or generating a multiplexed signal is applied.

Japanese Patent Application Laid-Open No. 10-1999-0033783 discloses a structure for separating and combining light by wavelength using a fiber grating, and the method using such an optical fiber grating is complicated in structure, difficult to miniaturize, and easy to expand the channel There is a disadvantage not to do.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a wavelength division multiplexing optical module and a home network system using the optical module, .

According to an aspect of the present invention, there is provided a wavelength division multiplexing optical module including a substrate, a core layer for guiding light to the substrate, the core layer being formed in the upper and lower cladding layers, the core layers extending in a straight line, At least two transverse waveguides arranged so as to extend in parallel with each other along a direction orthogonal to the extending direction of the transverse waveguide so as to become a pattern arranged in a zigzag manner along with the transverse waveguides; A planar optical waveguide structure having a plurality of longitudinal waveguides and forming a zigzag optical waveguide; The longitudinal waveguide of the zigzag photonic waveguide and the longitudinal waveguide are inserted at a position where the longitudinal waveguide and the longitudinal waveguide are in contact with each other to transmit the light of the set wavelength band along the incidence direction and the light of wavelengths out of the set wavelength band is directed in the direction orthogonal to the incidence direction A plurality of wavelength filters reflecting light along the zigzag waveguide; And a plurality of terminal waveguides formed on the core layer to transmit the light transmitted through the wavelength filter to the planar optical waveguide structure.

Preferably, the core layer includes: a first transverse waveguide extending linearly so as to be exposed to the outside of the substrate so as to receive light in a band that is wider than a transmission wavelength band of the wavelength filter; A first kind of waveguide whose one end is positioned adjacent to the other end of the first transverse waveguide and which extends along a direction orthogonal to the extending direction of the first transverse waveguide; A second transverse waveguide whose one end is located adjacent to the other end of the first type waveguide and extends in parallel with the extending direction of the first transverse waveguide; And a second kind of waveguide whose one end is positioned adjacent to the other end of the second transverse waveguide and extending in parallel with the extending direction of the first kind of waveguide, and the wavelength filter is inserted into the other end of the first transverse waveguide A first wavelength filter for passing light in a first wavelength band to the light traveling through the first transverse waveguide and reflecting the remaining light to the first type waveguide; And a second transverse waveguide for transmitting light of a second wavelength band different from the first wavelength band of light propagating through the first longitudinal waveguide inserted into the other end of the first waveguide and reflecting the remaining light to the second transverse waveguide, A wavelength filter; And a third wavelength band different from the first wavelength band and the second wavelength band among the light that is inserted into the other end of the second transverse waveguide and proceeds in the second transverse waveguide, Wherein the terminal waveguide extends from the first wavelength filter to the first transverse waveguide so as to transmit the light passing through the first transverse waveguide, A first terminal waveguide formed to extend along the direction of the first terminal waveguide; A second terminal waveguide formed to extend from the second wavelength filter along the extending direction of the first type waveguide so as to travel to the first type waveguide and transmit the light having passed through the second wavelength filter; And a third terminal waveguide formed to extend from the third wavelength filter along the extension direction of the second transverse waveguide so as to be able to proceed to the second transverse waveguide and transmit the light having passed through the third wavelength filter.

Preferably, the zigzag light waveguide includes a first transverse waveguide, a second transverse waveguide, and a second transverse waveguide. The zigzag light waveguide includes a first transverse waveguide and a second transverse waveguide. The length of the waveguide gradually decreases, and is formed to be disposed in the spacing space between the first longitudinal waveguide and the second longitudinal waveguide.

According to an aspect of the present invention, each of the terminal waveguides is connected to a relay optical fiber for transmitting light.

According to another aspect of the present invention, each of the terminal waveguides is connected to an optical device that receives light, converts the light into electric signals, or transmits light through the terminal waveguide.

According to another aspect of the present invention, at the end of the terminal waveguide, an inclined mirror for converting an optical path into a vertical phase is formed in the optical waveguide structure, and receives light incident through the inclined mirror, An optical element for transmitting light to the terminal waveguide is formed on the substrate bottom or the upper cladding layer.

According to another aspect of the present invention, there is provided a home network system comprising: a home gateway installed in a building or a transportation means of a subscriber to perform communication with an external communication network; And at least one optical fiber terminal installed in the building of the subscriber or in the transportation means for transmitting and receiving signals to and from the home gateway and having a terminal for connecting the home terminal, And the wavelength division optical module capable of transmitting and receiving optical signals through the respective wavelength division multiplexing optical modules, respectively.

According to the wavelength division multiplexing optical module and the home network system using the wavelength division multiplexing optical module according to the present invention, it is possible to achieve compactness and thinness by increasing integration efficiency due to channel expansion for separating and receiving multiplexed optical signals for each channel.

1 is a plan view showing a wavelength division multiplexing optical module according to a first embodiment of the present invention,
2 is a plan view showing a wavelength division multiplexing optical module according to a second embodiment of the present invention,
3 is a plan view showing a wavelength division multiplexed optical module according to a third embodiment of the present invention,
FIG. 4 is a cross-sectional view illustrating a structure for transmitting light through the optical device of FIG. 3,
5 is a schematic view illustrating a home network system equipped with a wavelength division multiplexing optical module according to the present invention.

Hereinafter, a wavelength division multiplexing optical module according to a preferred embodiment of the present invention and a home network system using the same will be described in detail with reference to the accompanying drawings.

1 is a plan view showing a wavelength division multiplexed optical module according to a first embodiment of the present invention.

1, a wavelength division optical module 100 according to the present invention includes a planar optical waveguide structure 110, first to fifth wavelength filters 161 to 165, first to second mirrors 171 and 172 And first to sixth relay optical fibers 191 to 196, and a transmission optical fiber 190.

The planar optical waveguide structure 110 has a structure in which a lower clad layer 112, a core layer 113 and an upper clad layer 114 are sequentially stacked on a substrate 111.

The core layer 113 formed in the upper and lower clad layers 112 and 113 and guiding the light is formed in a pattern indicated by a dotted line to form first through fifth wavelength filters 161 through 165 and first And the second mirrors 171 and 172 can switch the light path.

The optical path forming patterns formed on the core layer 113 are divided into first through fourth transverse waveguides 121 through 124 that extend in a straight line and are arranged to be spaced apart from each other in parallel and first through fourth transverse waveguides 121, To 124) are arranged in a zig-zag pattern in which the " d " shape is repeated. The optical waveguides And first to fourth longitudinal waveguides 131 to 134 formed to extend linearly in parallel to each other to form a zigzag waveguide.

The first to fifth wavelength filters 161 to 165 are inserted at an angle of 45 degrees to the bending point positions orthogonal to the zigzag waveguide, that is, the positions where the transverse waveguides 121 to 124 and the longitudinal waveguides 131 to 134 are in contact with each other The light of the set wavelength band is transmitted along the incidence direction and the light of wavelengths out of the set wavelength band is reflected along the zigzag lightwave along the direction orthogonal to the incidence direction.

The structures of the first to fifth wavelength filters 161 to 165 are variously known, and a detailed description thereof will be omitted.

The first to fifth terminal waveguides 141 to 145 are formed in the optical path pattern formed in the core layer 113 so as to transmit the light transmitted through the first to fifth wavelength filters 161 to 165.

The first transverse waveguide 121 is connected to the outside of the substrate 111 so as to be able to transmit or receive light through the one end, that is, the main terminal 180, with respect to the optical path formed in the core layer 113. [ As shown in FIG.

Here, the transmission optical fiber 190 connected through the main terminal 180 is for transmitting and receiving multi-wavelength light having a band broader than the transmission wavelength band of each of the wavelength filters 161 to 165.

The first type waveguide 131 is positioned at the other end of the first transverse waveguide 121, that is, adjacent to the first wavelength filter 161 and extends along a direction orthogonal to the extending direction of the first transverse waveguide 121 Respectively.

The second transverse waveguide 122 is positioned adjacent to the other end of the first type waveguide 131, that is, the second wavelength filter 162, and extends in parallel with the extending direction of the first transverse waveguide 121.

The second type waveguide 132 is positioned at the other end of the second transverse waveguide 122, that is, adjacent to the third wavelength filter 163, and extends in parallel with the extending direction of the first type waveguide 131.

The third transverse waveguide 123 extends horizontally to the left at the lower end of the second longitudinal waveguide 132 and the third longitudinal waveguide 133 extends to the left side of the third transverse waveguide 123 in the same zig- The fourth transverse waveguide 124 extends in the horizontal direction from the lower end of the third transverse wave 133 to the right and the fourth type waveguide 134 extends from the fourth transverse waveguide 124 As shown in Fig.

The first terminal waveguide 141 extends from the first wavelength filter 161 to the first transverse waveguide 121 so as to travel to the first transverse waveguide 121 and to transmit the light having passed through the first wavelength filter 161. [ And the second terminal waveguide 142 is formed so as to extend along the extension direction of the second wavelength filter 162 so as to extend to the first type waveguide 131 and to transmit the light having passed through the second wavelength filter 162. [ Type waveguide 131 along the extension direction of the first-type waveguide 131.

The third terminal waveguide 143 extends from the third wavelength filter 163 to the extension of the second transverse waveguide 122 so as to proceed to the second transverse waveguide 122 and to transmit the light having passed through the third wavelength filter 163. [ As shown in Fig.

The fourth terminal waveguide 144 is formed along the extension direction of the second type waveguide 132 so as to be able to transmit the light passing through the fourth wavelength filter and the fifth terminal waveguide 145 is formed along the extension direction of the third type waveguide 133 As shown in Fig.

The first wavelength filter 161 is inserted at the position where the first transverse waveguide 121 and the first terminal waveguide 141 and the first type waveguide 131 meet with each other, that is, the other end of the first transverse waveguide 121 The light of the first wavelength band? 1 is transmitted through the first transverse waveguide 121 and the remaining light is reflected by the first waveguide 131.

Similarly, the second wavelength filter 162 is inserted into the other end of the first-type waveguide 131 and excites the second wavelength λ1, which is a wavelength band different from the first wavelength band λ1, The second transverse waveguide 122, and the second transverse waveguide 122. In the second transverse waveguide 122,

The third wavelength filter 163 is inserted in the other end of the second transverse waveguide 122 and has a first wavelength band lambda 1 and a second wavelength band lambda 2 of light traveling in the second transverse waveguide 122, The second wavelength band? 3, and the second wavelength band? 3.

Similarly, the fourth wavelength filter 164 is provided at the other end of the second type waveguide 132 so as to transmit only the fourth wavelength band? 4, and the fifth wavelength filter 165 is provided at the other end of the fifth wavelength band type waveguide 133 so as to transmit only the light of wavelength? 5.

In this optical path forming structure, when the first transverse waveguide 121 is moved in a zigzag form along the first type waveguide 131 and the second transverse waveguide 122 with respect to the first transverse waveguide 121, The third transverse waveguide 123 and the fourth transverse waveguide 124 of the next order of the waveguide 122 gradually decrease in length and are arranged in the spacing space between the first longitudinal waveguide 131 and the second longitudinal waveguide 132 It can be seen that the degree of integration can be increased when the channel is increased.

The first mirror 171 converts the light traveling through the third transverse waveguide 123 to the third waveguide 133 and the second mirror 172 converts the light traveling through the fourth transverse waveguide 124 Type waveguide 134 to switch the optical path.

Unlike the illustrated example, the first and second mirrors 171 and 172 can be replaced by a wavelength filter that transmits only light of a selected wavelength and reflects the remaining light. In this case, a terminal waveguide May be formed at corresponding positions.

In this case, the terminal waveguide for transmitting the light transmitted through the wavelength filter that replaces the first mirror 171 may be formed so as to intersect with the second terminal waveguide 142, but optical interference is neglected due to mutually orthogonal optical paths .

In order to prevent the crossing of the terminal waveguide, it is preferable to reflect light propagating from the third transverse waveguide 123 toward the first mirror 171 toward the upper cladding layer 114 at the position of the first mirror 171 It is needless to say that a wavelength filter may be provided at a position where the mirror is formed and the light reflected upwardly may be formed or the reflection mirror may be formed again so that the paths are arranged in three dimensions so that the terminal waveguides do not cross each other.

In the case where the number of channels is increased as compared with the example shown in the drawing, even if the zigzag pattern increases in order as described above, the optical path does not intersect in the space between the first longitudinal waveguide 131 and the second longitudinal waveguide 132 .

In the example described above, the light of the multiple wavelengths? 1,? 2, ...,? N is transmitted through the first to fifth terminal waveguides 141 to 145 through the main terminal 180 to which the transmission optical fiber 190 is connected, And the relay optical fibers 191 to 196 connected to the sub-terminals 181 to 185 provided at the end of the fourth-type waveguide 134, respectively.

 2, each of the sub terminals 181 to 185 provided at the ends of the first to fifth terminal waveguides 141 to 145 and the fourth type waveguide 134 receives light, An optical element 290 such as a light receiving element for converting and outputting light or a light source for generating and transmitting light can be connected.

In addition, the optical elements can be integrally integrated with the optical waveguide structure 110, and examples thereof will be described with reference to Figs. 3 and 4. Fig. Elements having the same functions as those shown in the drawings previously described are denoted by the same reference numerals. 3 and 4 illustrate a structure having three channels in order to avoid the complexity of the drawings.

3 and 4, at an end of the first to third terminal waveguides 141 to 143 and the second type waveguide 132, an inclined mirror 118 for converting an optical path into a vertical phase is formed at the end of the optical waveguide structure An optical element 292 which is formed in the upper clad layer 110 and receives the light incident through the inclined mirror 118 or transmits the light to the terminal waveguides 141 to 143 through the inclined mirror 118, (Not shown).

In the illustrated example, an insulating layer 116 is formed on the upper clad layer 114, and a conductive pattern 119 for electrically connecting and driving the optical device 292 is formed on the insulating layer 116 It is a matter of course that a conductive pattern may be formed on the bottom of the substrate 111 and an optical element may be mounted on a conductive pattern (not shown) formed on the bottom of the substrate 111, unlike the illustrated example.

Here, the optical element 292 refers to a light emitting element or a light receiving element formed in a chip form.

It goes without saying that a transmitting or receiving chip 295 for driving the optical element 292 or for processing the signal received from the optical element 292 can be mounted via the conductive pattern 119. [

According to this structure, the optical module can process both the optical signal and the electric signal, and is integrally formed on a single substrate 111, thereby providing a thin optical module with a thin thickness.

In other words, in the case of a conventional method in which a module for processing an optical signal and a module for processing an electric signal are assembled after being assembled, it is difficult to miniaturize and integrate the module. However, according to the structure of the present invention, .

An example in which such a wavelength division optical module is installed in a home network system is shown in FIG.

Referring to FIG. 5, the home network system 300 includes a home gateway 320 and a photonic outlet 310.

The home gateway 320 and the optical fiber outlet 310 are installed in the building or transportation means of the subscriber to form a local area network in the subscriber environment.

The home gateway 320 is installed in the building or transportation means of the subscriber, performs communication with the external communication network 400, and relays communication with the home terminal connected through the optical terminal outlet 310.

Here, the transportation means means an automobile, a ship, or an aircraft.

The home gateway 320 is connected to the external communication network 400 and relays communication with home terminals (not shown) connected to the external communication network 400 and the optical terminal outlet 310.

The home gateway 320 includes a main processing unit 321 for processing signals received from the external communication network 400 and a plurality of wavelength division optical modules 100 connected to the main processing unit 321.

The main processing unit 321 processes the signal received from each wavelength division optical module 100 and outputs a transmission target signal to each wavelength division optical module 100. [

The optical fiber outlet 310 is provided in a building or a transportation means of a subscriber and is provided with a terminal for transmitting and receiving signals to and from the home gateway 320 and for connecting the home terminal.

The photonic outlets 310 may be installed so as to be exposed to the wall of the room in the case of a house.

A wavelength division multiplexed optical module 100 is installed in the optical fiber outlet 310.

The power outlet 310 may be provided with a power outlet or a cable TV terminal.

Each of the optical fiber outlets 310 and the home gateways 320 is capable of mutually transmitting and receiving optical signals through a transmission optical fiber 390. The wavelength division optical module 100 described above is installed in each of the optical fibers.

The optical terminal 310 and the wavelength division multiplexed optical module 100 provided in the home gateway 320 are interconnected with the transmission optical fiber 390 through the main terminal 190 to transmit and receive optical signals, respectively .

The wavelength division multiplexed optical module 100 provided in the optical terminal outlet 310 is formed so that the sub terminals 181 to 185 described above can be connected to a home terminal such as an IPTV or a computer or the sub terminals 181 to 185, The optical signal can be converted into an electrical signal and output through the final terminal.

According to the home network system 300, when a proper number of optical fiber outlets 310 are installed at the time of constructing a building or a transportation means of a subscriber, each optical fiber outlet 310 is provided with a wavelength division multiplexing The optical module 100 is provided and it is possible to secure the channel scalability by the multi-channel secured without increasing the transmission optical fiber 390 separately.

In addition, even when the number of channels is increased, since the optical path is formed in a zigzag shape corresponding to the additional channel between the first and second longitudinal waveguides 131 and 132, the wavelength division multiplexing optical module 100 has the same outer size The number of channels can be replaced with the extended wavelength division optical module 100, thereby providing an advantage that the channel can be expanded without changing the structure of the optical terminal outlets 310.

As described above, according to the wavelength division multiplexing optical module and the home network system adopting the wavelength division multiplexing optical module according to the present invention, the efficiency of integration due to channel expansion for separating and receiving multiplexed optical signals for each channel is increased, Provides advantages.

110: plane optical waveguide structure
121 to 124: First to fourth transverse waveguides
131 to 134: first to fourth waveguides
141 to 145: First to fifth terminal waveguides
161 to 165: First to fifth wavelength filters
171: First mirror
172: second mirror
180: transmission optical fiber

Claims (7)

And a core layer for guiding light to the substrate are formed in the upper and lower clad layers, wherein the core layer includes at least two or more transverse waveguides extending in a straight line and arranged to be spaced apart from each other, At least two longitudinal waveguides formed so as to extend in a straight line along a direction orthogonal to the extending direction of the transverse waveguides so as to form a pattern arranged in a zigzag form along the optical paths, An optical waveguide structure;
The longitudinal waveguide of the zigzag photonic waveguide and the longitudinal waveguide are inserted at a position where the longitudinal waveguide and the longitudinal waveguide are in contact with each other to transmit the light of the set wavelength band along the incidence direction and the light of wavelengths out of the set wavelength band is directed in a direction orthogonal to the incidence direction A plurality of wavelength filters reflecting light along the zigzag waveguide;
And a plurality of terminal waveguides formed on the core layer to transmit the light transmitted through the wavelength filter to the planar optical waveguide structure,
The core layer includes a first transverse waveguide extending in a straight line so as to be exposed to the outside of the substrate so as to receive light in a band broader than the transmission wavelength band of the wavelength filter through one end;
A first kind of waveguide whose one end is positioned adjacent to the other end of the first transverse waveguide and which extends along a direction orthogonal to the extending direction of the first transverse waveguide;
A second transverse waveguide whose one end is located adjacent to the other end of the first type waveguide and extends in parallel with the extending direction of the first transverse waveguide; And
And a second type waveguide whose one end is positioned adjacent to the other end of the second transverse waveguide and extends in parallel with the extending direction of the first type waveguide,
The wavelength filter
A first wavelength filter inserted in the other end of the first transverse waveguide and passing light in a first wavelength band to the light traveling through the first transverse waveguide and reflecting the remaining light to the first type waveguide;
And a second transverse waveguide for transmitting light of a second wavelength band different from the first wavelength band of light propagating through the first longitudinal waveguide inserted into the other end of the first waveguide and reflecting the remaining light to the second transverse waveguide, A wavelength filter;
And a third wavelength band different from the first wavelength band and the second wavelength band among the light that is inserted into the other end of the second transverse waveguide and proceeds in the second transverse waveguide, And a third wavelength filter for reflecting the third wavelength light,
The terminal waveguide
A first terminal waveguide formed to extend from the first wavelength filter along the extending direction of the first transverse waveguide so as to be able to transmit light passing through the first transverse waveguide and passed through the first wavelength filter;
A second terminal waveguide formed to extend from the second wavelength filter along the extending direction of the first type waveguide so as to travel to the first type waveguide and transmit the light having passed through the second wavelength filter;
And a third terminal waveguide formed to extend from the third wavelength filter along the extension direction of the second transverse waveguide so as to be able to transmit light passing through the third transverse waveguide and passing through the third wavelength filter,
Wherein the zigzag light waveguide has a length of a transverse waveguide of the next order of the second transverse waveguide when proceeding in zigzag form along the first longitudinal waveguide and the second transverse waveguide from the first transverse waveguide with respect to the first transverse waveguide, Wherein the first and second longitudinal waveguides are arranged in a spaced-apart space between the first type waveguide and the second type waveguide. delete delete The wavelength division multiplexing optical module according to claim 1, wherein each of the terminal waveguides is connected to a relay optical fiber for transmitting light. The wavelength division multiplexing optical module according to claim 1, wherein each of the terminal waveguides is connected to an optical device that receives light and converts the optical signal into an electric signal or transmits light through the terminal waveguide. The optical waveguide structure according to claim 1, wherein an end of the terminal waveguide is provided with a tilting mirror for converting an optical path into a vertical image, the tilting mirror receiving light incident through the tilting mirror, And an optical element for transmitting light to the terminal waveguide is formed on the substrate bottom or the upper cladding layer. A home gateway installed in the building or transportation means of the subscriber and performing communication with an external communication network;
And at least one optical terminal outlet installed in the building of the subscriber or in the transportation means and having a terminal capable of transmitting and receiving signals with the home gateway and connecting the home terminal,
A wavelength division optical module capable of transmitting and receiving an optical signal through a transmission optical fiber is respectively installed in the optical terminal outlet and the home gateway,
The wavelength division multiplexing optical module
And a core layer for guiding light to the substrate are formed in the upper and lower clad layers, wherein the core layer includes at least two or more transverse waveguides extending in a straight line and arranged to be spaced apart from each other, At least two longitudinal waveguides formed so as to extend in a straight line along a direction orthogonal to the extending direction of the transverse waveguides so as to form a pattern arranged in a zigzag form along the optical paths, An optical waveguide structure;
The longitudinal waveguide of the zigzag photonic waveguide and the longitudinal waveguide are inserted at a position where the longitudinal waveguide and the longitudinal waveguide are in contact with each other to transmit the light of the set wavelength band along the incidence direction and the light of wavelengths out of the set wavelength band is directed in a direction orthogonal to the incidence direction A plurality of wavelength filters reflecting light along the zigzag waveguide;
And a plurality of terminal waveguides formed on the core layer to transmit the light transmitted through the wavelength filter to the planar optical waveguide structure,
A transverse waveguide formed so as to transmit the transmission optical fiber and the transmission optical fiber while forming the zigzag optical waveguide,
The core layer
A first transverse waveguide extending linearly so as to be exposed to the outside of the substrate so as to receive light in a band broader than the transmission wavelength band of the wavelength filter through one end;
A first kind of waveguide whose one end is positioned adjacent to the other end of the first transverse waveguide and which extends along a direction orthogonal to the extending direction of the first transverse waveguide;
A second transverse waveguide whose one end is located adjacent to the other end of the first type waveguide and extends in parallel with the extending direction of the first transverse waveguide; And
And a second type waveguide whose one end is positioned adjacent to the other end of the second transverse waveguide and extends in parallel with the extending direction of the first type waveguide,
The wavelength filter
A first wavelength filter inserted in the other end of the first transverse waveguide and passing light in a first wavelength band to the light traveling through the first transverse waveguide and reflecting the remaining light to the first type waveguide;
And a second transverse waveguide for transmitting light of a second wavelength band different from the first wavelength band of light propagating through the first longitudinal waveguide inserted into the other end of the first waveguide and reflecting the remaining light to the second transverse waveguide, A wavelength filter;
And a third wavelength band different from the first wavelength band and the second wavelength band among the light that is inserted into the other end of the second transverse waveguide and proceeds in the second transverse waveguide, And a third wavelength filter for reflecting the third wavelength light,
The terminal waveguide
A first terminal waveguide formed to extend from the first wavelength filter along the extending direction of the first transverse waveguide so as to be able to transmit light passing through the first transverse waveguide and passed through the first wavelength filter;
A second terminal waveguide formed to extend from the second wavelength filter along the extending direction of the first type waveguide so as to travel to the first type waveguide and transmit the light having passed through the second wavelength filter;
And a third terminal waveguide formed to extend from the third wavelength filter along the extending direction of the second transverse waveguide so as to travel to the second transverse waveguide and transmit the light having passed through the third wavelength filter,
Wherein the zigzag light waveguide has a length of a transverse waveguide of the next order of the second transverse waveguide when proceeding in zigzag form along the first longitudinal waveguide and the second transverse waveguide from the first transverse waveguide with respect to the first transverse waveguide, Wherein the first type of waveguide and the second type of waveguide are formed in a spaced-apart space between the first type waveguide and the second type waveguide.

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