JP2008096490A - Light receiving assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light receiving assembly improved in assembling workability and connection reliability. <P>SOLUTION: In the light receiving assembly 10, a plurality of demultiplexing segment filters are provided with a filter surface whose reflection wavelength is different from each other, and also the demultiplexing segment filters are laminated in a manner that the filter surfaces are apart from each other with prescribed spaces in structuring a wavelength filter. A plurality of lenses are provided in an optical incident/exiting block that makes a multiplexed optical signal to enter the wavelength filter at a prescribed angle. Then, the optical incident/exiting block and the specific surface of the wavelength filter are jointed together. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical receiver assembly used in an optical module for transmitting a Gigabit class Ethernet signal.

  In recent years, the Internet has been established as a communication infrastructure, and various types of industries and services have been taken in regardless of the type of information such as data communication, voice, and video, and its application range continues to expand. In line with this, the line capacity is steadily increasing. Among them, Ethernet is popular as a core technology widely used in home LAN (Local Area Network) and WAN (Wide Aera Network) due to low cost and simple operability.

  In this situation, standardization of 10 Gigabit Ethernet (registered trademark) has already been completed, and 10 Gigabit compatible network equipment has been developed by each company. As a result, optical modules are also 1 Gigabit mainly for medium-distance networks. The upgrade from 10 Giga has started.

  An example of an optical module is an optical transceiver that is connected to an optical fiber and transmits and receives an optical signal to and from the optical fiber. The optical transceiver includes, on an electrical wiring board, an optical transmission assembly (TOSA) that converts an electrical signal into an optical signal and transmits the optical signal, and an optical reception assembly (ROSA) that receives the optical signal and converts it into an electrical signal.

  As an optical receiving assembly, there is an optical receiving assembly that demultiplexes a multiplexed optical signal input from an external transmission line such as an optical fiber into optical signals having different wavelengths (monochromatic optical signals) and receives each monochromatic optical signal (for example, , See Patent Document 1).

  FIG. 10 is a transparent perspective view of a conventional optical receiver assembly.

  As shown in FIG. 10, the optical receiver assembly 100 includes an optical block 101 formed of a transparent material, an optical fiber 107 that inputs a multiplexed optical signal L to the optical block 101, and an optical signal having a specific wavelength. A plurality of wavelength filters 105 that transmit and reflect optical signals of other wavelengths, a plurality of mirrors 106 that reflect the optical signal reflected by the wavelength filter 105 toward the adjacent wavelength filter, and the transmitted monochromatic optical signal Are each provided with a plurality of plane mirrors 104, a plurality of lenses 103 for condensing monochromatic light signals bent by the plane mirror 104, and a plurality of photodetectors 102 for detecting the respective monochromatic light signals.

  The four-wave multiplexed optical signal L input from the optical fiber 107 and propagating through the optical block 101 is incident on the first wavelength filter 105 (left side in the figure). The multiplexed optical signal L incident on the wavelength filter 105 transmits only the optical signal having the specific wavelength λ1, and reflects other optical signals having wavelengths λ2 to λ4. The reflected optical signal is reflected again by the mirror 106, enters the adjacent wavelength filter 105, and transmits only the optical signal having the specific wavelength λ2. The transmission of the optical signal of the specific wavelength and the reflection of the other optical signal are repeated, and the optical signals having different wavelengths λ1, λ2, λ3, and λ4 are emitted from the wavelength filters 105, respectively. Optical signals having different wavelengths (monochromatic optical signals) are bent by the plane mirror 104, collected by the lens 103, and detected by the photodetector 102.

  Further, as shown in FIG. 10, the output end of the optical fiber 107 that inputs the multiplexed optical signal L and the input end of the optical fiber 102 that outputs the demultiplexed monochromatic optical signal have a condensing action and a reflecting action. Some optical receiving assemblies are provided with a concave mirror 108 and have a reduced number of parts.

JP 2005-274702 A JP 54-158247 A

  However, in the conventional optical receiving assembly 100, in order to demultiplex the multiplexed optical signal L and cause the photodetector 102 to receive the demultiplexed optical signals, respectively, a mirror 106, a wavelength filter 105, a plane mirror 104, and Each lens 103 is required to have high positional accuracy. Therefore, the flatness of the optical block 101 on which these members are provided must be high, and it takes time to produce an optical block having a high flatness, resulting in an increase in cost.

  In addition, the optical receiving assembly 100 is configured by arranging the wavelength filters 105 having different transmission wavelengths on the surface of the optical block 101 in parallel, so that the optical receiving assembly 100 has a complicated structure, which causes high cost in the assembly process. .

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an optical receiver assembly that solves the above-described problems, maintains the reliability of optical signal demultiplexing and light reception, and is easy to assemble.

The present invention was devised to achieve the above object, and the invention of claim 1 reflects only an optical signal having a specific wavelength among multiplexed optical signals obtained by multiplexing optical signals having different wavelengths. A demultiplexing segment filter that transmits an optical signal having a wavelength; a plurality of lenses that collect or collimate the optical signals reflected by the demultiplexing segment filters; In an optical receiver assembly comprising a plurality of light receiving elements for receiving signals,
The plurality of demultiplexing segment filters have filter surfaces with different reflection wavelengths, and the demultiplexing segment filters are stacked so that the filter surfaces have a predetermined interval to form a wavelength filter.
The light input / output block for allowing the multiplexed optical signal to enter the wavelength filter at a predetermined angle includes the plurality of lenses.
An optical receiver assembly in which the light incident / exit block and a predetermined surface of the wavelength filter are joined.

According to a second aspect of the present invention, the wavelength filter includes:
A first filter surface, a second filter surface, and the filter surface are sequentially formed by laminating the demultiplexing segment filters so as to have a predetermined interval from the light incident / exit block side. A total reflection mirror is formed on the surface opposite to the surface to be joined to the block,
The multiplexed optical signal incident from the light entrance / exit block enters the first filter surface at a predetermined angle, reflects an optical signal of a predetermined wavelength, and transmits an optical signal of another wavelength,
Among the optical signals transmitted through the first filter surface by the second filter surface, an optical signal of a predetermined wavelength is reflected, an optical signal of another wavelength is transmitted and sequentially demultiplexed into different wavelengths, 2. The optical receiver assembly according to claim 1, wherein an optical signal transmitted through each of the filter surfaces formed on the wavelength filter is reflected by the reflection mirror.

  According to a third aspect of the present invention, the light incident / exit block has a reflecting surface for reflecting the optical signals reflected from the demultiplexing segment filters, and the optical signals reflected by the reflecting surfaces. The optical receiver assembly according to claim 1, wherein the optical receiver is optically coupled to each of the lenses.

  According to the present invention, it is possible to improve the assembly workability and the connection reliability.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  First, an optical transceiver will be described with reference to FIGS. 7 and 8 as an example of an optical module on which the optical receiver assembly of the present embodiment is mounted.

  As shown in FIGS. 7 and 8, the optical transceiver 50 is a four-wave CWDM (Coarse-WDM: low density wavelength division multiplexing) LX4 optical transceiver using a plurality of long wavelength semiconductor lasers (LDs).

  The optical transceiver 50 includes a circuit board (main board) 51 made of a rigid board, an optical transmission assembly 52 mounted on the circuit board 51, and the optical reception assembly 10 according to the present embodiment.

  The circuit board 51 is formed with four transmission lanes 54 for transmitting electrical signals for transmission from network devices such as a switching hub and a media converter to which the optical transceiver 50 is connected.

  The optical transmission assembly 52 includes four 1.3 μm band DFB (distributed feedback) -LDs 55 for converting electrical signals from the four transmission lanes 54 into optical signals, and optical multiplexing for wavelength multiplexing the optical signals of the LDs 55. And is housed in a substantially rectangular parallelepiped OSA (Optical Sub Assembly) base 52b made of a metal such as Al having high heat dissipation. Each LD 55 is obtained by housing LD elements as light emitting elements in a CAN package.

  The wavelengths of the LD 55 are 1275, 1300, 1325, and 1350 nm bands. As the optical multiplexer 56, four optical filters that reflect an optical signal in a predetermined wavelength band and transmit an optical signal in the other wavelength band are used. A pigtailed transmission optical fiber 57 for transmitting the wavelength-multiplexed optical signal from the optical multiplexer 56 is connected to the optical transmission assembly 52 via an optical connector.

  A pigtailed receiving optical fiber 12 is connected to the optical receiving assembly 10 via an optical connector. As will be described in detail later, the optical receiving assembly 10 converts an optical demultiplexer (wavelength filter) 14 that demultiplexes the multiplexed optical signal from the receiving optical fiber 12 and converts the demultiplexed optical signal into an electrical signal. A 4ch-PD array 20 including four PDs (photodiodes) 19 and four preamplifiers 21 for amplifying each electric signal are provided.

  The circuit board 51 is also formed with a reception lane 63 for transmitting an electric signal for reception. The other end (the opposite end to the SC connector described later) of the circuit board 51 is a card edge portion 68 on which a terminal is formed. By engaging with the card edge connector provided in the network device, the optical transceiver 50 is activated. Wire insertion / extraction is possible.

  The circuit board 51 is connected to the four LD drivers 64 that drive each LD 55, a signal processing circuit 65 that has a clock and data recovery function and performs alignment of lanes, and the like, and the optical transmission assembly 52 and the optical reception assembly 10. And a DOM circuit (Digital Optical Monitoring) 66 for monitoring each LD 55 and each PD 19. Various controls and monitors of the optical transceiver 50 can be accessed by serial communication in a network device by an MDIO (Management Data Input / Output) / MDC (Management Data Clock) interface.

  The transmission optical fiber 57 and the reception optical fiber 12 are each connected to the other end of the SC connector 67 via an optical connector. A transmission optical fiber is connected to one end of the SC connector 67 via an optical connector.

  Briefly explaining the operation of the optical transceiver 50, four transmission electrical signals (XAUI (10 Gigabit Attachment Unit Interface) Tx Data) of 3.125 Gbit / s from a network device are converted into four optical signals in each LD55. These optical signals are combined by the optical multiplexer 56 and transmitted to the transmission optical fiber as a multiplexed optical signal. On the other hand, the multiplexed optical signal from the transmission optical fiber is demultiplexed into four optical signals by an optical demultiplexer (wavelength filter) 14, converted into four electric signals by each PD 19, and four receiving electric signals. (XAUI Rx Data) is transmitted to the network device.

  The optical transceiver 50 has a total length of about 80 mm, a width of about 40 mm, and a length of the circuit board 51 of 50 to 60 mm.

  FIG. 1 is a perspective view showing a preferred embodiment of an optical receiver assembly according to the present invention.

  As shown in FIGS. 1 and 2, the optical receiver assembly 10 of the present embodiment includes a base 11, a receptacle 13 connected to an optical fiber 12 for introducing a multiplexed optical signal, and a multiplexed light introduced. A wavelength filter 14 for demultiplexing the signal and a plurality of light receiving elements for receiving the demultiplexed optical signal are provided.

  The base 11 is formed of a metal such as SUS using, for example, MIM (metal powder injection molding method).

  A receptacle portion 13 is fixed to one side surface of the base 11, and an optical path 15 through which a multiplexed optical signal propagates from the receptacle portion 13 toward the center of the base is formed in the upper surface of the base. A wavelength filter housing chamber 16 is formed in the center of the base 11 so as to communicate with the optical path 15. A wavelength filter 14 is accommodated in the wavelength filter accommodation chamber 16. The receptacle unit 13 includes a condenser lens for collimating the light emitted from the optical fiber 12.

  As shown in FIG. 9, the plurality of light receiving elements are a photodiode array 92 in which a plurality of photodiodes 91 are arranged in parallel, and the photodiode array 92 is provided in the CAN package 17 and hermetically sealed. A CAN type PD90 is configured.

  The photodiode array 92 is formed in a substantially strip shape as a whole, and a plurality of photodiodes 91 are linearly arranged along the length direction at the center thereof, and wiring is provided on both sides along the arrangement direction of these photodiodes. A plurality of pads 93 are formed.

  The CAN package 17 is formed in a cylindrical cylinder, and a substrate 96 is provided on the inner bottom surface of the cylinder, and a photodiode array 92 and other electronic circuits (for example, a preamplifier) 97 are provided on the substrate 96. Yes. A plurality of pins (leads) 18 provided through the substrate 96 in the CAN package 17 are arranged on the circuit board 51 (see FIG. 7) of the optical transceiver on the photodiode array 92 and the electronic circuit mounted on the inner bottom surface. It is for conducting with the provided electronic circuit.

  Around each pin 18 penetrating the substrate 96, each pin 18 is attached to the substrate 96 and an insulator 98 such as low melting glass is filled in order to hermetically seal the inside of the CAN package 17. On the outer periphery of the CAN package 17, there is provided a positioning member 99 for positioning when the CAN type PD 90 is attached to the base 11 (see FIG. 1). The CAN type PD 90 having the above configuration is attached to the base 11 so that the light receiving surface of each photodiode array 91 and the optical axis of each condenser lens 40 (see FIG. 3 described later) coincide.

  The wavelength filter 14 is a wavelength selective reflection type filter assembly, and details thereof will be described with reference to FIGS. 3 and 4A to 4C.

  As shown in FIG. 3 and FIG. 4A, the wavelength filter 14 includes a plurality of demultiplexing segment filters 32, 33, and 34, and multiplexing from an optical fiber at a predetermined angle on one surface of the laminate. An optical signal is incident, and the joining surfaces 31a (first filter surface), 32a (second filter surface), 33a (third filter surface) of each of the demultiplexing segment filters 32, 33, 34 and the final stage The optical signal having different wavelengths (blocking wavelengths) is sequentially reflected by the surface (reflection surface) 34a.

  That is, each of the demultiplexing segment filters 32 to 34 has first to third filter surfaces 31a to 33a having different reflection wavelengths. Furthermore, in the present embodiment, the wavelength filter 14 is configured by laminating the demultiplexing segment filters 32 to 34 so that the first to third filter surfaces 31a to 33a have a predetermined interval.

  On one side of the first-stage demultiplexing segment filter 32, the multiplexed optical signal is incident on the first-stage demultiplexing segment filter 32 at a predetermined angle, and at each of the joint surfaces 31a, 32a, 33a and the final-stage surface 34a. An entrance / exit block 31 that emits the demultiplexed / reflected optical signal is joined.

  Each of the demultiplexing segment filters 32 to 34 is a substantially rectangular parallelepiped optical block in which thin films having different refractive indexes are sequentially deposited on the surface, and these optical blocks are stacked side by side.

  As shown in FIG. 4B, the first-stage and second-stage demultiplexing segment filters 32 and 33 include a block formed of an optically transparent resin and a filter film provided on one surface of the block. The surfaces (filter surfaces) 31a, 32a on which the filter film is provided are joined to the light incident / exit block 31 or the preceding segment filter segment filter 32 in contact with the filter surfaces 31a, 32a.

  However, as shown in FIG. 4C, in the final-stage demultiplexing segment filter 34, a total reflection mirror film is provided on the surface facing the filter surface 33a, and the total reflection mirror film forms the reflection surface 34a. To do. The reflection surface 34a may be formed of a filter film instead of the total reflection mirror film.

  The demultiplexing segment filters 32 to 34 are stacked at least (number of demultiplexing-1) of multiplexed optical signals. In this embodiment, in order to demultiplex a multiplexed optical signal into four different wavelength optical signals, three demultiplexing segment filters are stacked.

  Returning to FIG. 3, on one side of a light entrance / exit block (left front in the figure) 31 on which the multiplexed optical signal is incident, an incident portion 35 for allowing the multiplexed optical signal to enter at a predetermined angle is formed. The wavelength filter 14 is joined to the light entrance / exit block 31 by joining the first filter surface 31 a and the surface 31 x facing the incident portion 35 of the light entrance / exit block 31.

  The wavelength filter 14 is disposed in the wavelength filter housing 16 so that the incident part 35 is positioned on the optical path side, and the multiplexed optical signal introduced from the receptacle part 13 is incident on the incident part 35 at a predetermined angle. Is done.

  Further, as shown in FIG. 5, on one surface of the light entrance / exit block 31, a lens for condensing or collimating the optical signals demultiplexed / reflected by the filter surfaces 31a, 32a, 33a and the reflecting surface 34a. An array 36 is provided integrally. That is, the incident portion 35 and the lens array 36 are formed on one surface of the light incident / exit block 31, the incident portion 35 is formed on one side of the one surface, and the lens array 36 is formed on the other side of the one surface. The lens array 36 has a plurality of condenser lenses 40 arranged in parallel, and each condenser lens 40 is made of resin. Each condensing lens 40 condenses or parallelizes each optical signal reflected by each demultiplexing segment filter 32 to 34.

  Further, in the present embodiment, the filter surfaces 31a, 32a, 33a of the demultiplexing segment filters 32, 33, 34 and the demultiplexing of the final stage are provided on the side where the incident portion 35 of the light incident / exit block 31 is formed. A mirror that reflects each optical signal reflected by the reflecting surface 34a of the segment filter 34 at a substantially right angle is formed, and the wavelength filter 14, the lens array 36, and the mirror are integrally formed.

  Specifically, as shown in FIG. 5, a plurality of condenser lenses 40 and a lens support member 37 that supports the condenser lenses 40 are integrally formed in the light incident / exit block 31. The lens support member 37 is integrally formed with the light incident / exit block 31 in an L shape. Further, the lens support member 37 is formed so as to protrude from one surface of the incident portion 35 formed in the light incident / exit block 31.

  On the upper surface of the lens support member 37, a plurality of substantially hemispherical condenser lenses (four in the figure) 40 are provided in parallel and in accordance with the position of the light receiving element.

  The lower surface of the lens support member 37 is cut obliquely, and a mirror 38 is provided as a block-side reflecting surface formed of a metal film on the cut surface. The mirror 38 reflects each optical signal reflected from each of the demultiplexing segment filters 32 to 34. The mirror 38 is formed so as to optically couple each optical signal reflected by the mirror 38 to each condenser lens 40.

  The lens support member 37 is formed so as to protrude from one surface of the incident portion 35. When the lens support member 37 that supports the condenser lens 40 is formed inside the incident portion 35, the collimator incident from the incident portion 35 is formed. This is to prevent the multiplexed optical signal from being blocked by the mirror 38 formed on the lower surface of the lens support member 37. Therefore, if the multiplexed optical signal incident by the mirror 38 is not blocked, it does not have to be formed in a protruding manner.

  In the present embodiment, between the incident portion 35 and the first filter surface 31a, between the first filter surface 31a and the second filter surface 32b, between the second filter surface 32b and the third filter surface 33c, and third. The pitch of the condensing lens 40 which condenses each optical signal of wavelength (lambda) 1- (lambda) 4 demultiplexed by each filter surface 31a-31c and the reflective surface 34a, etc., equidistantly between filter surface 33c-reflecting surface 34a, etc. Formed at intervals.

  Next, the operation of the present embodiment will be described.

  The four-wave multiplexed optical signal L having the wavelengths λ1 to λ4 incident on the receptacle 13 from the optical fiber 12 is collimated and introduced into the optical path 15 provided in the base 11. The multiplexed optical signal L is incident on the incident portion 35 of the light incident / exit block 31 that is integrally joined to the wavelength filter 14 at a predetermined angle.

  In the wavelength filter 14, the multiplexed signal L incident from the incident portion 35 has a wavelength λ 1 on the joint surface (first filter surface) 31 a between the light incident / exit block 31 and the first-stage demultiplexing segment filter 32. Only the optical signal is reflected, and the optical signals with wavelengths λ2 to λ4 are transmitted. The optical signal having the wavelength λ2 to λ4 reflects only the optical signal having the wavelength λ2 at the junction surface (second filter surface) 32a between the first-stage demultiplexing segment filter 32 and the second-stage demultiplexing segment filter 33. Further, the optical signal of wavelength λ3 is reflected at the joint surface (third filter surface) 33a between the second-stage demultiplexing segment filter 33 and the third-stage (final stage) demultiplexing segment filter 34. To do. The optical signal having the wavelength λ4 is reflected by the end face 34a of the demultiplexing segment filter 34 at the final stage.

  The respective optical signals reflected by the joint surfaces 31a, 32a, 33a and the end surface 34a of the demultiplexing wavelength segment filter 34 are reflected at substantially right angles (upward in the drawing) by the mirrors 38, respectively. The light is collected from the lens 40 and emitted.

  The optical signals emitted from the condenser lenses 40 are collected and received by the photodiodes 91 (see FIG. 9). The received optical signal is converted into an electrical signal and transmitted to the signal processing circuit 65 (see FIG. 7).

  In the optical receiving assembly 10 of the present embodiment, the wavelength filter 14 and the lens array 36 are integrally formed, so that connection reliability is maintained without alignment between the wavelength filter 14 and the lens array 36. And it can produce easily.

  Since the lens array 36 is formed integrally with the wavelength filter 14, in order to fix the condenser lens 40, the wavelength filter 14 and the mirror 38 to the base 11 with high accuracy, only the filter housing chamber 16 is finished with high flatness. The base 11 can be manufactured in a short time and at a low cost.

  In the present embodiment, since the wavelength filter 14, the lens array 36, and the mirror 38 are integrally formed, they can be handled as one part as a filter lens assembly, and parts management becomes easy.

  In the wavelength filter 14, since the filter surfaces 31a, 32a, and 33a are covered with the light incident / exit block 31 and the demultiplexing segment filters 32, 33, and 34, it is not necessary to provide protective glass. Therefore, since the structure of the wavelength filter is simpler than that of the conventional wavelength filter, it can be manufactured at low cost.

  Further, since the wavelength filter 14 has a structure in which the demultiplexing segment filters 32, 33, and 34 are stacked side by side, the size can be increased as compared with the conventional wavelength filter within a range that can be accommodated in the base 11. Therefore, handling of the wavelength filter becomes easy. This is also a factor for reducing the cost of the wavelength filter 14.

  In this embodiment, the mirror 38 is provided in the wavelength filter 14 because of the positional relationship with the light receiving element, but the mirror 38 may not be provided.

  For example, as shown in FIG. 6, a plurality of condenser lenses 40 are provided in parallel on one side of the end surface where the incident portion 35 of the light incident / exit block 31 is formed in accordance with the optical axis of the reflected optical signal. May be.

1 is a perspective view showing a preferred embodiment of an optical receiving assembly according to the present invention. It is a perspective view which shows the state which removed the CAN package of the optical receiver assembly of FIG. It is a perspective view which shows the filter lens assembly of a wavelength filter and a lens array integrated type. 3A is a cross-sectional view of the filter lens assembly of FIG. 3, FIG. 3B is a cross-sectional view of the first-stage and second-stage demultiplexing segment filters, and FIG. 3C is a cross-sectional view of the final-stage demultiplexing segment filter. FIG. 4 is an enlarged perspective view of a main part of the filter lens assembly of FIG. 3. FIG. 6 shows an integrated filter assembly according to another embodiment. It is a perspective view which shows an optical transceiver. It is a circuit diagram of an optical transceiver. It is a perspective view which shows the internal structure of CAN type | mold PD. It is a transparent perspective view which shows the conventional optical receiver assembly. FIG. 6 is a conceptual diagram showing a configuration of a conventional optical receiving assembly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optical receiving assembly 11 Base 12 Optical fiber 13 Receptacle part 14 Wavelength filter 17 CAN package 31 Light input / output block 32, 33, 34 Segment filter for demultiplexing 36 Lens array 38 Mirror

Claims (3)

Of the multiplexed optical signals obtained by multiplexing optical signals having different wavelengths, the optical signal having a specific wavelength is reflected and the optical signals having other wavelengths are transmitted, and the plurality of demultiplexing segment filters are reflected. In a light receiving assembly comprising a plurality of lenses for condensing or collimating each optical signal and a plurality of light receiving elements for receiving each optical signal emitted from the lens,
The plurality of demultiplexing segment filters have filter surfaces with different reflection wavelengths, and the demultiplexing segment filters are stacked so that the filter surfaces have a predetermined interval to form a wavelength filter.
The light input / output block for allowing the multiplexed optical signal to enter the wavelength filter at a predetermined angle includes the plurality of lenses.
An optical receiver assembly, wherein the light incident / exit block and a predetermined surface of the wavelength filter are joined. The wavelength filter is
A first filter surface, a second filter surface, and the filter surface are sequentially formed by laminating the demultiplexing segment filters so as to have a predetermined interval from the light incident / exit block side. A total reflection mirror is formed on the surface opposite to the surface to be joined to the block,
The multiplexed optical signal incident from the light entrance / exit block enters the first filter surface at a predetermined angle, reflects an optical signal of a predetermined wavelength, and transmits an optical signal of another wavelength,
Among the optical signals transmitted through the first filter surface by the second filter surface, an optical signal of a predetermined wavelength is reflected, an optical signal of another wavelength is transmitted and sequentially demultiplexed into different wavelengths, The optical receiving assembly according to claim 1, wherein the optical signal transmitted through each of the filter surfaces formed on the wavelength filter is reflected by the reflection mirror.   The light incident / exit block has a reflecting surface for reflecting the optical signals reflected from the demultiplexing segment filters, and the optical signals reflected by the reflecting surfaces are respectively transmitted to the lenses. The optical receiver assembly according to claim 1 or 2, wherein the optical receiver assembly is combined.

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