WO2020155426A1 - 多路波分复用光接收组件以及光模块 - Google Patents

多路波分复用光接收组件以及光模块 Download PDF

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Publication number
WO2020155426A1
WO2020155426A1 PCT/CN2019/083929 CN2019083929W WO2020155426A1 WO 2020155426 A1 WO2020155426 A1 WO 2020155426A1 CN 2019083929 W CN2019083929 W CN 2019083929W WO 2020155426 A1 WO2020155426 A1 WO 2020155426A1
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WIPO (PCT)
Prior art keywords
light
optical
parallel
unit
division multiplexing
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PCT/CN2019/083929
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English (en)
French (fr)
Inventor
李林科
吴天书
杨现文
张健
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武汉联特科技有限公司
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Application filed by 武汉联特科技有限公司 filed Critical 武汉联特科技有限公司
Priority to US16/753,375 priority Critical patent/US11262512B2/en
Publication of WO2020155426A1 publication Critical patent/WO2020155426A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/40—Transceivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/506—Multiwavelength transmitters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
    • G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
    • G02B6/29362—Serial cascade of filters or filtering operations, e.g. for a large number of channels
    • G02B6/29365—Serial cascade of filters or filtering operations, e.g. for a large number of channels in a multireflection configuration, i.e. beam following a zigzag path between filters or filtering operations
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4206—Optical features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4207—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4214—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4246—Bidirectionally operating package structures
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4292—Coupling light guides with opto-electronic elements the light guide being disconnectable from the opto-electronic element, e.g. mutually self aligning arrangements

Definitions

  • the present invention relates to the field of optical communication technology, in particular to a multi-channel wavelength division multiplexing optical receiving assembly and an optical module.
  • the optical module has four main components: optical transmitting component, optical receiving component, PCBA, and packaging shell.
  • optical transmitting component As the module functions more and more, the power consumption is also increasing, even for the optical transmitting and receiving components.
  • the number of channels has doubled.
  • the size of the IC chip on the PCBA has become larger, and the number of components has increased accordingly, which has brought great challenges to the layout of the PCB.
  • the package size of the light emitting component and the light receiving component is reduced, more PCB layout space can be reserved. Therefore, reducing the package size of the optical device is of the most practical significance.
  • the object of the present invention is to provide a multiple wavelength division multiplexing optical receiving assembly and an optical module, which are effective by folding back the optical signal decomposed by the optical demultiplexing unit, and arranging the light receiving unit as a whole under the reflector.
  • the length of the light receiving unit is greatly shortened, and the reflective light demultiplexing unit is similar in structure to the conventional transmissive light demultiplexing unit and the manufacturing process is the same, which does not increase the process complexity.
  • a multiple wavelength division multiplexing optical receiving assembly including a housing and a substrate mounted on the bottom of the housing, the housing and the substrate enclosing To form the installation chamber, it also includes:
  • the light emitting unit is used to send the first parallel light with multiple wavelength optical signals,
  • the optical demultiplexing unit is used to decompose the first parallel light into multiple second parallel lights with a single wavelength, and reflect each of the second parallel lights back to the light exit of the light emitting unit,
  • a reflecting mirror for reflecting each of the second parallel lights at the light exit of the light emitting unit
  • a light receiving unit configured to receive and process each of the second parallel lights reflected by the reflector, and is located under the optical demultiplexer;
  • the light emitting unit, the light demultiplexing unit, the reflector, and the light receiving unit are all arranged in the installation chamber, and the light emitting unit, the light demultiplexing unit, and the The reflecting mirrors are all fixed on the housing, and the light receiving unit is installed on the substrate.
  • the optical demultiplexing unit includes a polyhedral structure having a first inclined surface and a second inclined surface that are parallel to each other, and the first inclined surface and the second inclined surface are both along the light receiving unit to the The direction of the reflecting mirror is inclined, and the inclined direction is far away from the light emitting unit, the first inclined surface is close to the light outlet of the light emitting unit; the first inclined surface has a light entrance position for the first parallel light to enter And a plurality of filters arranged in sequence, the plurality of filters correspond to a plurality of the second parallel lights one-to-one, and each of the filters only serves the corresponding second parallel light Transmitting;
  • the second inclined surface has a first total reflection film for reflecting the first parallel light transmitted by the light-in position to the first inclined surface.
  • an included angle between the first parallel light reflected by the first total reflection film and the first parallel light emitted by the light emitting unit is greater than 0° and less than 90°.
  • the polyhedral structure further has a first parallel surface and a second parallel surface both parallel to the first parallel light, and the second parallel surface is close to the light receiving unit.
  • an anti-reflection filter is installed at the light entrance position.
  • the light emitting unit includes an optical fiber adapter for emitting optical signals having multiple wavelengths, and a collimating lens for collimating the optical signal sent from the end face of the optical fiber adapter into the first parallel light.
  • the reflecting mirror is coated with a second total reflection film.
  • the light receiving unit includes a PD array for converting optical signals into electrical signals and a TIA array for amplifying and shaping the electrical signals output by the PD array, and the PD array is located under the mirror, The TIA array and the PD array are located in the same plane, and are located below the optical demultiplexing unit.
  • the converging lens array for converging multiple paths of the second parallel light
  • the converging lens array is located below the reflector, and the array direction of the converging lens array is the same as that of the light emitting unit
  • the included angle between the optical axes is equal to the included angle between the reflector and the optical axis of the light emitting unit.
  • an optical module including a housing, further including a light emitting component and the above-mentioned multiple wavelength division multiplexing optical receiving component, the light emitting component and the multiple wavelength
  • the multiplexed light receiving components are all arranged on the housing.
  • the present invention has the beneficial effect of folding back the optical signals decomposed by the optical demultiplexing unit, and laying out the light receiving unit as a whole under the reflector, thereby effectively reducing the cost of the light receiving unit.
  • the length of the reflective optical demultiplexing unit is similar to that of the conventional transmissive optical demultiplexing unit and the manufacturing process is the same, which does not increase process complexity.
  • FIG. 1 is a schematic diagram of the appearance structure of a multiple wavelength division multiplexing optical receiving component provided by an embodiment of the present invention
  • FIG. 2 is a front view of the optical path of a multiple wavelength division multiplexing optical receiving component provided by an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of an optical demultiplexer of a multiple wavelength division multiplexing optical receiving component provided by an embodiment of the present invention
  • FIG. 4 is a side view of an optical path of a multiple wavelength division multiplexing optical receiving component provided by an embodiment of the present invention
  • an embodiment of the present invention provides a multiple wavelength division multiplexing optical receiving assembly, including a housing 1 and a substrate 2 mounted on the bottom of the housing 1, the housing 1 and the substrate 2 enclosed to form an installation chamber, which is characterized in that it also includes a light emitting unit, a light demultiplexing unit 4, a mirror 7 and a light receiving unit.
  • the light emitting unit, the light demultiplexing unit 4, the reflecting mirror 7, and the light receiving unit are all arranged in the installation chamber, and the light emitting unit and the light demultiplexing unit 4 And the reflecting mirror 7 is fixed on the casing 1, and the light receiving unit is installed on the substrate 2.
  • the light emitting unit is used to transmit the first parallel light with multiple wavelength optical signals
  • the optical demultiplexing unit 4 is used to decompose the first parallel light into multiple second parallel lights with a single wavelength, and Each of the second parallel lights is reflected back to the light exit of the light emitting unit
  • the reflector 7 is used to reflect each of the second parallel lights at the light exit of the light emitting unit
  • the light receiving unit is used to receive and Each of the second parallel lights reflected by the mirror 7 is processed, and is located under the optical demultiplexer.
  • the light emitting unit, the light demultiplexing unit 4, and the light receiving unit are usually arranged in sequence along the optical path, and they are all located on the same horizontal line, which is similar to the "in-line" arrangement.
  • the optical demultiplexing unit is a traditional transmissive light demultiplexing unit, that is, the first parallel light in this embodiment is split into multiple second parallel lights after passing through the transmissive light demultiplexing unit.
  • the size of the components in the optical receiving unit will become larger, and the components will increase accordingly, which will inevitably make the PCB layout space in the optical module smaller and smaller. If the above layout is still adopted, It will seriously affect the molding of the optical module.
  • the optical demultiplexing unit 4 used is a reflective optical demultiplexing unit. Specifically, it has the function of decomposing the first parallel light into multiple second parallel lights. It can also reflect each second parallel light back to the function of the light exit of the light emitting unit, and then be reflected once by the reflector 7 to reflect each second parallel light into the light receiving unit, so that it can be
  • the position of the light receiving unit is arranged by the reflection angle of 7, for example, the light receiving unit is arranged under the optical demultiplexing unit 4, which overcomes the space problem caused by the above-mentioned "in-line" arrangement.
  • PCB layout reserves more space.
  • the light emitting unit, the light demultiplexing unit 4, the reflecting mirror 7 and the light receiving unit are all arranged in the installation chamber, the overall structure of the light receiving assembly will not be affected.
  • the optical demultiplexing unit 4 includes a polyhedral structure 40 having a first inclined surface 400 and a second inclined surface 401 parallel to each other, and the first inclined surface Both the second inclined surface 400 and the second inclined surface 401 are inclined along the direction from the light receiving unit to the reflecting mirror 7, and the inclined direction is away from the light emitting unit.
  • the first inclined surface 400 is close to the light output of the light emitting unit.
  • the first inclined surface 400 has a light-in position for the first parallel light to enter and a plurality of filters arranged in sequence, a plurality of the filters and a plurality of the second parallel light One correspondence, and each of the filters only transmits the second parallel light corresponding to it;
  • the second inclined surface 401 has a function for reflecting the first parallel light transmitted by the light advance position to the The first total reflection film of the first inclined surface 400.
  • a polyhedral structure 40 is used to decompose the optical signal.
  • the first inclined surface 400 and the second inclined surface 401 of the polyhedral structure 40 are parallel to each other, but have different functions. First, the first parallel light It penetrates into the polyhedral structure 40 from the first inclined surface 400 to the second inclined surface 401.
  • the second inclined surface 401 has a first total reflection film and has a certain inclination angle
  • the first parallel The light is reflected back to the first inclined surface 400, and then transmitted one by one through a plurality of filters, thereby achieving decomposition.
  • the optical signals of multiple wavelengths fused by the first parallel light are respectively defined as ⁇ 1 , ⁇ 2 , ⁇ 3 , and ⁇ 4
  • the multiple filters are respectively defined as the first filter 41
  • the second filter 42, the third filter 43 and the fourth filter 44, the first filter 41 has a narrow-band transmission film matching the ⁇ 1 passband, and the second filter 42 has a matching ⁇ 2 pass
  • the third filter 43 has a narrow-band transmission film matching the ⁇ 3 passband
  • the fourth filter 44 has a narrow-band transmission film matching the ⁇ 4 passband.
  • the first parallel light is inclined from the first
  • the light entering position of the surface 400 is transmitted to the second inclined surface 401
  • the second inclined surface 401 reflects the first parallel light to the first inclined surface 400.
  • the optical signal with the wavelength ⁇ 1 can pass from the first filter 41
  • the optical signals of several other wavelengths are reflected back to the second inclined surface 401 again, and then the optical signals doped with ⁇ 2 , ⁇ 3 , and ⁇ 4 are again reflected by the second inclined surface 401 to the first inclined surface 401
  • the optical signal with a wavelength of ⁇ 2 can be transmitted from the second filter 42 at this time, while the optical signals of several other wavelengths are reflected back to the second inclined surface 401, and then doped with ⁇ 3
  • the optical signal of ⁇ 4 is reflected by the second inclined surface 401 to the first inclined surface 400 for the third time.
  • the optical signal of wavelength ⁇ 3 can be transmitted from the third filter 43, and the optical signal is ⁇ 4 wavelength.
  • the optical signal is reflected back to the second inclined surface 401 again, and then the optical signal is reflected by the second inclined surface 401 to the first inclined surface 400 for the fourth time, and is transmitted through the fourth filter 44, thereby completing The process of decomposing the first parallel light into multiple second parallel lights.
  • the layout position of the light emitting unit can be flexibly changed, and is no longer restricted by the conventional "in-line" layout.
  • the light receiving unit can be set in the light The position below the demultiplexing unit 4 greatly reduces the occupied space.
  • the reflector 7 is plated with a second total reflection film.
  • the angle between the first parallel light reflected by the first total reflection film and the first parallel light emitted by the light emitting unit is greater than 0° and less than 90°.
  • the angle between the first parallel light in the light path direction after the first reflection of the first total reflection film and the light path direction when the first parallel light is emitted is between 0° and 90°, preferably Yes, when the included angle is closer to 0°, that is, when the folding back is close to 180°, the length of the light receiving component can be shortened most effectively. Therefore, preferably, the above-mentioned inclination angles of the first inclined surface 400 and the second inclined surface 401 are adjustable to facilitate subsequent adjustments.
  • the polyhedral structure 40 also has a first parallel surface 402 and a second parallel surface 403 that are both parallel to the first parallel light.
  • the two parallel surfaces 403 are close to the light receiving unit.
  • the first parallel surface 402 and the second parallel surface 403 are the upper and lower surfaces of the polyhedron structure 40, which are parallel to the first parallel light, which can facilitate the installation of the polyhedron structure 40 in the housing 1.
  • the polyhedral structure 40 can be a hexahedral structure, or an octahedral structure, or even a structure with more faces, but it only needs to ensure that there are two parallel first inclined surfaces 400 and second inclined surfaces 401. , And the first parallel surface 402 and the second parallel surface 403 parallel to the first parallel light.
  • This embodiment does not make any limitation on this, and other structures also fall within the protection scope of this application.
  • an anti-reflection filter 45 is installed at the light entrance position.
  • an anti-reflection filter 45 is installed at the light entrance position of the first inclined surface 400 to facilitate the transmission of optical signals of all wavelengths.
  • the light emitting unit includes an optical fiber adapter 30 for transmitting optical signals with multiple wavelengths and an optical fiber adapter 30 for transmitting the end face of the optical fiber adapter 30.
  • the light signal is collimated into the collimating lens 31 of the first parallel light.
  • the light emitting unit is composed of an optical fiber adapter 30 and a collimating lens 31.
  • the purpose of the optical fiber adapter 30 is to transmit optical signals with multiple wavelengths, and the purpose of the collimating lens 31 is to collimate these optical signals into Parallel light.
  • the light receiving unit includes a PD array 50 for converting optical signals into electrical signals and amplifying the electrical signals output by the PD array 50
  • a shaped TIA array 51 the PD array 50 is located under the reflector 7, and the TIA array 51 and the PD array 50 are located in the same plane and located under the optical demultiplexing unit 4.
  • the light receiving unit is composed of a PD (light receiving) array and a TIA array 51. In a conventional light receiving component, the two are sequentially arranged at the end of the above-mentioned "in-line" arrangement.
  • the PD array 50 can be arranged under the reflector 7, and the TIA (transimpedance amplifier) array can be arranged under the optical demultiplexing unit 4. Therefore, the height space in the installation cavity can be used for PCB
  • the layout board reserves more space.
  • the light receiving assembly further includes a converging lens array 6 for converging multiple paths of the second parallel light, and the converging lens array 6 is located in the Below the reflector 7, and the angle between the array direction of the converging lens array 6 and the optical axis (direction of light emission) of the light emitting unit and the light of the reflector 7 and the light emitting unit The angles between the axes (the direction in which the light is emitted) are equal.
  • the converging lens array 6 can converge the multiple optical signals into a plurality of small light spots so as to be sent to the PD array 50.
  • the light receiving unit is adhered to the substrate 2;
  • the substrate 2 includes a PCB board, a rigid-flex board with an FPC board, or a metal board pasted with the FPC board.
  • the substrate 2 there are many types of the substrate 2 to be selected, which is not limited in this embodiment.
  • An embodiment of the present invention provides an optical module, including a housing, a light emitting component, and the above-mentioned multiple wavelength division multiplexing optical receiving component.
  • the optical transmitting component and the multiple wavelength division multiplexing optical receiving component are both provided On the shell.
  • the above-mentioned multiple wavelength division multiplexing optical receiving component is adopted, and the optical signal decomposed by the optical demultiplexing unit is folded back, and the light receiving unit is placed under the mirror as a whole, thereby effectively shortening
  • the length of the light receiving unit is not changed, so that the size of the existing housing will not be changed, and the reflective light demultiplexing unit is similar in structure to the conventional transmissive light demultiplexing unit and the manufacturing process is the same, without increasing the process Complexity.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Optical Communication System (AREA)

Abstract

本发明涉及光通信技术领域，提供了一种多路波分复用光接收组件，包括壳体和安装于壳体底部的基板，壳体和基板围合形成安装腔室，还包括光发射单元、光解复用单元、反射镜以及光接收单元；光发射单元、光解复用单元、反射镜以及光接收单元均设于安装腔室内，且光发射单元、光解复用单元以及反射镜均固定在壳体上，光接收单元安装在基板上。本发明还提供一种光模块，包括上述的一种多路波分复用光接收组件。本发明通过将光解复用单元分解的光信号折返回去，并将光接收单元整体布局在反射镜的下方，从而有效地缩短了光接收单元的长度，而该反射性的光解复用单元与常规的透射性的光解复用单元的结构类似且制作工艺相同，不会增加工艺复杂性。

Description

多路波分复用光接收组件以及光模块 技术领域
本发明涉及光通信技术领域，具体为一种多路波分复用光接收组件以及光模块。
背景技术
更高速率、更高集成、更小封装一直是高速光模块的发展方向，目前小封装尺寸的100G QSFP28光收发模块已经在数据中心和以太网获得大批量的应用，下一代的光模块在未来几年将是200G、400G，随后向800G发展，为了达到光交换机光接口高密度需求，200G、400G甚至是800G光模块的封装要保持和QSFP28相当的外形尺寸，这对光模块的封装设计提出了很高的挑战。
光模块有光发射组件、光接收组件、PCBA、封装外壳四个主要组成部分，速率的提高，伴随着模块功能越来越多，功耗也越来越大，甚至于光发射和接收组件的通道数翻倍，与之对应的，PCBA上IC芯片尺寸变大，元件也相应增多，这给PCB的布板带来了很大的挑战。从这方面而言，如果将光发射组件、光接收组件的封装尺寸减小，则可以预留更多的PCB布板空间，因此，减小光器件的封装尺寸是最具有实际意义的。
发明内容
本发明的目的在于提供一种多路波分复用光接收组件以及光模块，通过将光解复用单元分解的光信号折返回去，并将光接收单元整体布局在反射镜的下方，从而有效地缩短了光接收单元的长度，而该反射性的光解复用单元与常规的透射性的光解复用单元的结构类似且制作工艺相同，不会增加工艺复杂性。
为实现上述目的，本发明实施例提供如下技术方案：一种多路波分复用光接收组件，包括壳体和安装于所述壳体底部的基板，所述壳体和所述基板 围合形成安装腔室，还包括：
光发射单元，用于发送具有多个波长光信号的第一平行光，
光解复用单元，用于将所述第一平行光分解为具有单一波长的多路第二平行光，且将各所述第二平行光反射回所述光发射单元的出光口处，
反射镜，用于反射所述光发射单元的出光口处的各所述第二平行光，
光接收单元，用于接收并处理所述反射镜反射来的各所述第二平行光，且位于所述光解复用器的下方；
所述光发射单元、所述光解复用单元、所述反射镜以及所述光接收单元均设于所述安装腔室内，且所述光发射单元、所述光解复用单元以及所述反射镜均固定在所述壳体上，所述光接收单元安装在所述基板上。
进一步，所述光解复用单元包括具有互相平行的第一倾斜面和第二倾斜面的多面体结构，所述第一倾斜面和所述第二倾斜面均沿所述光接收单元至所述反射镜方向倾斜，且倾斜方向远离所述光发射单元，所述第一倾斜面靠近所述光发射单元的出光口；所述第一倾斜面具有供所述第一平行光进入的进光位以及依次排布的多个滤光片，多个所述滤光片与多个所述第二平行光一一对应，且每一所述滤光片仅供与其对应的所述第二平行光透射；所述第二倾斜面具有用于反射所述进光位透射来的第一平行光至所述第一倾斜面的第一全反射膜。
进一步，所述第一全反射膜反射的所述第一平行光与所述光发射单元发射的所述第一平行光之间的夹角大于0°且小于90°。
进一步，所述多面体结构还具有均与所述第一平行光平行的第一平行面和第二平行面，所述第二平行面靠近所述光接收单元。
进一步，所述进光位处安设有增透型滤光片。
进一步，所述光发射单元包括用于发射具有多个波长的光信号的光纤适配器以及用于将所述光纤适配器的端面发送的光信号准直成所述第一平行光 的准直透镜。
进一步，所述反射镜镀有第二全反射膜。
进一步，所述光接收单元包括用于将光信号转换为电信号的PD阵列以及用于将所述PD阵列输出的电信号放大整形的TIA阵列，所述PD阵列位于所述反射镜的下方，所述TIA阵列与所述PD阵列位于同一平面内，且位于所述光解复用单元的下方。
进一步，还包括用于汇聚多路所述第二平行光的的汇聚透镜阵列，所述汇聚透镜阵列位于所述反射镜的下方，且所述汇聚透镜阵列的阵列方向与所述光发射单元的光轴之间的夹角和所述反射镜与所述光发射单元的光轴之间的夹角相等。
本发明实施例提供另一种技术方案：一种光模块，包括外壳，还包括光发射组件以及上述的一种多路波分复用光接收组件，所述光发射组件以及所述多路波分复用光接收组件均设于所述外壳上。
与现有技术相比，本发明的有益效果是：通过将光解复用单元分解的光信号折返回去，并将光接收单元整体布局在反射镜的下方，从而有效地缩短了光接收单元的长度，而该反射性的光解复用单元与常规的透射性的光解复用单元的结构类似且制作工艺相同，不会增加工艺复杂性。
附图说明
图1为本发明实施例提供的一种多路波分复用光接收组件的外形结构示意图；
图2为本发明实施例提供的一种多路波分复用光接收组件的光路正视图；
图3为本发明实施例提供的一种多路波分复用光接收组件的光解复用器的结构示意图；
图4为本发明实施例提供的一种多路波分复用光接收组件的光路侧视图；
附图标记中：1-壳体；2-基板；30-光纤适配器；31-准直透镜；4-光解复 用单元；40-多面体结构；400-第一倾斜面；401-第二倾斜面；402-第一平行面；403-第二平行面；41-第一滤光片；42-第二滤光片；43-第三滤光片；44-第四滤光片；45-增透型滤光片；50-PD阵列；51-TIA阵列；6-汇聚透镜阵列；7-反射镜。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
实施例一：
请参阅图1-4，本发明实施例提供一种多路波分复用光接收组件，包括壳体1和安装于所述壳体1底部的基板2，所述壳体1和所述基板2围合形成安装腔室，其特征在于，还包括光发射单元、光解复用单元4、反射镜7以及光接收单元。所述光发射单元、所述光解复用单元4、所述反射镜7以及所述光接收单元均设于所述安装腔室内，且所述光发射单元、所述光解复用单元4以及所述反射镜7均固定在所述壳体1上，所述光接收单元安装在所述基板2上。其中，光发射单元用于发送具有多个波长光信号的第一平行光，光解复用单元4用于将所述第一平行光分解为具有单一波长的多路第二平行光，且将各所述第二平行光反射回所述光发射单元的出光口处，反射镜7用于反射所述光发射单元的出光口处的各所述第二平行光，光接收单元用于接收并处理所述反射镜7反射来的各所述第二平行光，且位于所述光解复用器的下方。在现有技术中，光发射单元、光解复用单元4以及光接收单元通常都是沿着光路依次排布的，它们整体位于同一条水平线上，也就是类似于“一字型”排布，其中，光解复用单元为传统的透射性光解复用单元，即本实施例中的第一平行光透射过该透射性光解复用单元后即分解为多路第二平行光，但是 随着速率的提升，光接收单元中的零部件的尺寸将变大，元件也相应的增多，势必就会让光模块中PCB的布板空间越来越小，若还是采用上述的布局，将会严重影响光模块的成型。因此，在本实施例中，所采用的的光解复用单元4属于反射性的光解复用单元，具体的，它具有将第一平行光分解为多路第二平行光的功能，同时它还可以将各第二平行光反射回光发射单元的出光口处的功能，然后再由反射镜7配合反射一次，将各第二平行光反射到光接收单元中，如此就可以根据反射镜7的反射角度来布局光接收单元的位置，如，光接收单元设在光解复用单元4的下方，如此就克服了上述“一字型”的排布方式所带来的空间问题，为PCB布板预留了更多的空间。另外，由于所述光发射单元、所述光解复用单元4、所述反射镜7以及所述光接收单元均设于所述安装腔室内，也不会影响到光接收组件的整体结构。
以下为具体实施例：
优化上述方案，请参阅图2、图3和图4，所述光解复用单元4包括具有互相平行的第一倾斜面400和第二倾斜面401的多面体结构40，所述第一倾斜面400和所述第二倾斜面401均沿所述光接收单元至所述反射镜7方向倾斜，且倾斜方向远离所述光发射单元，所述第一倾斜面400靠近所述光发射单元的出光口；所述第一倾斜面400具有供所述第一平行光进入的进光位以及依次排布的多个滤光片，多个所述滤光片与多个所述第二平行光一一对应，且每一所述滤光片仅供与其对应的所述第二平行光透射；所述第二倾斜面401具有用于反射所述进光位透射来的第一平行光至所述第一倾斜面400的第一全反射膜。在本实施例中，采用一多面体结构40来进行光信号的分解，该多面体结构40具有的第一倾斜面400和第二倾斜面401互相平行，但起不同的作用，首先，第一平行光从第一倾斜面400处透射进该多面体结构40内，直至第二倾斜面401上，由于第二倾斜面401具有第一全反射膜，且其具有一定的倾斜角，因此可以将第一平行光反射回第一倾斜面400处，再由多个滤 光片一一透射，从而实现分解。为了便于详细描述，将第一平行光所融合的多个波长的光信号分别定义为λ 1、λ 2、λ 3、λ 4，而多个滤光片分别定义为第一滤光片41、第二滤光片42、第三滤光片43以及第四滤光片44，且第一滤光片41具有匹配λ 1通带的窄带透射膜，第二滤光片42具有匹配λ 2通带的窄带透射膜，第三滤光片43具有匹配λ 3通带的窄带透射膜，第四滤光片44具有匹配λ 4通带的窄带透射膜，首先，第一平行光从第一倾斜面400的进光位透射至第二倾斜面401，第二倾斜面401将第一平行光反射至第一倾斜面400处，此时波长为λ 1的光信号可以从第一滤光片41透射而出，而其他几个波长的光信号则被重新反射回第二倾斜面401，接着掺杂着λ 2、λ 3、λ 4的光信号再次被第二倾斜面401反射到第一倾斜面400处，此时波长为λ 2的光信号可以从第二滤光片42透射而出，而其他几个波长的光信号则被重新反射回第二倾斜面401，接着掺杂着λ 3、λ 4的光信号第三次被第二倾斜面401反射到第一倾斜面400处，此时波长为λ 3的光信号可以从第三滤光片43透射而出，而为λ 4波长的光信号则被重新反射回第二倾斜面401，接着该光信号第四次被第二倾斜面401反射到第一倾斜面400处，并从第四滤光片44透射而出，从而完成第一平行光分解为多路第二平行光的过程。而且由于光信号进行了折返，使得光发射单元的布局位置可以灵活多变，不再受常规“一字型”布局的限制，特别是再配合反射镜7后，可以将光接收单元设在光解复用单元4的下方位置，极大地缩小了占用空间，优选的，所述反射镜7镀有第二全反射膜。
进一步优化上述方案，图3，所述第一全反射膜反射的所述第一平行光与所述光发射单元发射的所述第一平行光之间的夹角大于0°且小于90°。在本实施例中，第一全反射膜在经过第一次反射后的光路方向第一平行光与最初第一平行光发射时的光路方向之间的夹角在0～90°之间，优选的，当该夹角越接近0°，即折返近乎180°时，可以最有效地缩短光接收组件的长度。因此，优选的，上述的第一倾斜面400和第二倾斜面401的倾斜角度是可调的，以 便于后期配合调整。
作为本发明实施例的优化方案，图2、图3和图4，所述多面体结构40还具有均与所述第一平行光平行的第一平行面402和第二平行面403，所述第二平行面403靠近所述光接收单元。在本实施例中，该第一平行面402和第二平行面403即多面体结构40的上下表面，它们均与第一平行光平行，可以便于该多面体结构40在壳体1内安装。优选的，该多面体结构40可以是六面体结构，也可以是八面体结构，甚至是具有更多面的结构，但只需要其保证有两个互相平行的第一倾斜面400和第二倾斜面401，以及与所述第一平行光平行的第一平行面402和第二平行面403即可。本实施例并未对此作出任何限定，而其他结构也均落入本申请的保护范围内。
作为本发明实施例的优化方案，请参阅图3，所述进光位处安设有增透型滤光片45。在本实施例中，第一倾斜面400的进光位安设有增透型滤光片45可以便于透射所有波长的光信号。
作为本发明实施例的优化方案，请参阅图2和图4，所述光发射单元包括用于发射具有多个波长的光信号的光纤适配器30以及用于将所述光纤适配器30的端面发送的光信号准直成所述第一平行光的准直透镜31。在本实施例中，光发射单元由光纤适配器30和准直透镜31组成，光纤适配器30的目的是发射具有多个波长的光信号，而准直透镜31的目的是将这些光信号准直为平行光。
作为本发明实施例的优化方案，请参阅图2和图4，所述光接收单元包括用于将光信号转换为电信号的PD阵列50以及用于将所述PD阵列50输出的电信号放大整形的TIA阵列51，所述PD阵列50位于所述反射镜7的下方，所述TIA阵列51与所述PD阵列50位于同一平面内，且位于所述光解复用单元4的下方。在本实施例中，光接收单元由PD(光接收)阵列和TIA阵列51组成，在传统的光接收组件中，二者依次设置于上述“一字型”排布形式 的最尾端。而经过上述光折返后，PD阵列50可以设于反射镜7的下方，TIA(跨阻放大器)阵列可以设于光解复用单元4的下方，因此可以利用安装腔室内的高度空间，给PCB布板预留更多的空间。
作为本发明实施例的优化方案，请参阅图2和图4，本光接收组件还包括用于汇聚多路所述第二平行光的的汇聚透镜阵列6，所述汇聚透镜阵列6位于所述反射镜7的下方，且所述汇聚透镜阵列6的阵列方向与所述光发射单元的光轴(光线射出的方向)之间的夹角和所述反射镜7与所述光发射单元的光轴(光线射出的方向)之间的夹角相等。在本实施例中，采用汇聚透镜阵列6可以将多路光信号汇聚成多个小的光斑，以便于送至PD阵列50。
作为本发明实施例的优化方案，所述光接收单元粘接于所述基板2上；所述基板2包括PCB板、带有FPC板的软硬结合板或粘贴有FPC板的金属板。在本实施例中，基板2选用的种类有很多，本实施例也不对此进行限定。
实施例二：
本发明实施例提供一种光模块，包括外壳，光发射组件以及上述的一种多路波分复用光接收组件，所述光发射组件以及所述多路波分复用光接收组件均设于所述外壳上。在本实施例中，采用上述的多路波分复用光接收组件，通过将光解复用单元分解的光信号折返回去，并将光接收单元整体布局在反射镜的下方，从而有效地缩短了光接收单元的长度，从而不会改变现有的外壳尺寸，而该反射性的光解复用单元与常规的透射性的光解复用单元的结构类似且制作工艺相同，不会增加工艺复杂性。
尽管已经示出和描述了本发明的实施例，对于本领域的普通技术人员而言，可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型，本发明的范围由所附权利要求及其等同物限定。

Claims (10)

  1. 一种多路波分复用光接收组件，包括壳体和安装于所述壳体底部的基板，所述壳体和所述基板围合形成安装腔室，其特征在于，还包括：
    光发射单元，用于发送具有多个波长光信号的第一平行光，
    光解复用单元，用于将所述第一平行光分解为具有单一波长的多路第二平行光，且将各所述第二平行光反射回所述光发射单元的出光口处，
    反射镜，用于反射所述光发射单元的出光口处的各所述第二平行光，
    光接收单元，用于接收并处理所述反射镜反射来的各所述第二平行光，且位于所述光解复用器的下方；
    所述光发射单元、所述光解复用单元、所述反射镜以及所述光接收单元均设于所述安装腔室内，且所述光发射单元、所述光解复用单元以及所述反射镜均固定在所述壳体上，所述光接收单元安装在所述基板上。
  2. 如权利要求1所述的多路波分复用光接收组件，其特征在于：所述光解复用单元包括具有互相平行的第一倾斜面和第二倾斜面的多面体结构，所述第一倾斜面和所述第二倾斜面均沿所述光接收单元至所述反射镜方向倾斜，且倾斜方向远离所述光发射单元，所述第一倾斜面靠近所述光发射单元的出光口；所述第一倾斜面具有供所述第一平行光进入的进光位以及依次排布的多个滤光片，多个所述滤光片与多个所述第二平行光一一对应，且每一所述滤光片仅供与其对应的所述第二平行光透射；所述第二倾斜面具有用于反射所述进光位透射来的第一平行光至所述第一倾斜面的第一全反射膜。
  3. 如权利要求2所述的多路波分复用光接收组件，其特征在于：所述第一全反射膜反射的所述第一平行光与所述光发射单元发射的所述第一平行光之间的夹角大于0°且小于90°。
  4. 如权利要求2所述的多路波分复用光接收组件，其特征在于：所述多面体结构还具有均与所述第一平行光平行的第一平行面和第二平行面，所述第二平行面靠近所述光接收单元。
  5. 如权利要求2所述的多路波分复用光接收组件，其特征在于：所述进光位处安设有增透型滤光片。
  6. 如权利要求1所述的多路波分复用光接收组件，其特征在于：所述光发射单元包括用于发射具有多个波长的光信号的光纤适配器以及用于将所述光纤适配器的端面发送的光信号准直成所述第一平行光的准直透镜。
  7. 如权利要求1所述的一种多路波分复用光接收组件，其特征在于：所述反射镜镀有第二全反射膜。
  8. 如权利要求1所述的多路波分复用光接收组件，其特征在于：所述光接收单元包括用于将光信号转换为电信号的PD阵列以及用于将所述PD阵列输出的电信号放大整形的TIA阵列，所述PD阵列位于所述反射镜的下方，所述TIA阵列与所述PD阵列位于同一平面内，且位于所述光解复用单元的下方。
  9. 如权利要求1所述的多路波分复用光接收组件，其特征在于：还包括用于汇聚多路所述第二平行光的的汇聚透镜阵列，所述汇聚透镜阵列位于所述反射镜的下方，且所述汇聚透镜阵列的阵列方向与所述光发射单元的光轴之间的夹角和所述反射镜与所述光发射单元的光轴之间的夹角相等。
  10. 一种光模块，包括外壳，其特征在于：还包括光发射组件以及如权利要求1-9任一所述的一种多路波分复用光接收组件，所述光发射组件以及所述多路波分复用光接收组件均设于所述外壳上。
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