WO2023061024A1 - 光接收组件及光模块 - Google Patents

光接收组件及光模块 Download PDF

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Publication number
WO2023061024A1
WO2023061024A1 PCT/CN2022/112098 CN2022112098W WO2023061024A1 WO 2023061024 A1 WO2023061024 A1 WO 2023061024A1 CN 2022112098 W CN2022112098 W CN 2022112098W WO 2023061024 A1 WO2023061024 A1 WO 2023061024A1
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WIPO (PCT)
Prior art keywords
optical
signal output
multiplexed signal
optical signal
integrated chip
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PCT/CN2022/112098
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English (en)
French (fr)
Inventor
孙雨舟
李显尧
郭德汾
于登群
Original Assignee
苏州旭创科技有限公司
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Application filed by 苏州旭创科技有限公司 filed Critical 苏州旭创科技有限公司
Priority to EP22879971.4A priority Critical patent/EP4418030A1/en
Publication of WO2023061024A1 publication Critical patent/WO2023061024A1/zh
Priority to US18/631,603 priority patent/US20240259107A1/en

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Classifications

    • 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
    • H04B10/60—Receivers
    • 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
    • G02B6/29367—Zigzag path within a transparent optical block, e.g. filter deposited on an etalon, glass plate, wedge acting as a stable spacer
    • 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
    • G02B6/29379—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 characterised by the function or use of the complete device
    • G02B6/2938—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 characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
    • 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
    • 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
    • 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
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems

Definitions

  • the invention belongs to the technical field of optical communication, and in particular relates to an optical receiving component and an optical module.
  • wavelength division multiplexing (WDM) technology is an effective means for increasing optical communication capacity.
  • Integrated wave division multiplexing components, modulators, high-speed optical detectors, lasers and other important devices in photonic integrated chips can not only realize wave division multiplexing, but also effectively reduce the size of optical modules and improve integration.
  • the central wavelength will change with the width, height, inclination angle and ambient temperature of the optical waveguide, and due to the influence of actual processing difficulty, the different positions of the optical waveguide
  • the width, height, and inclination angle of the photonic integrated chip are different, and the ambient temperature is also different, which leads to the unsatisfactory effect of wave division multiplexing of the photonic integrated chip, and has the disadvantages of high loss, crosstalk, and low isolation, and cannot meet the needs of optical modules in terms of demultiplexing. Requirements for flat tops in specific bands.
  • the object of the present invention is to provide an optical receiving component and an optical module, which can achieve the comprehensive effects of high isolation, low insertion loss and low cost in terms of wavelength division and multiplexing.
  • one embodiment of the present invention provides a light receiving component, including:
  • a wave division multiplexer in free space which has a multiplexed signal input port and at least two multiplexed signal output ports, when the multiplexed signal input port receives optical signals with multiple adjacent wavelength bands, at least one of the The wavelength bands of the optical signals output by the multiplexing signal output ports are not adjacent;
  • the photonic integrated chip is provided with a wavelength division multiplexing component, and the optical signal output from the multiplexed signal output port is divided into optical signals of required wavelength bands by the wavelength division multiplexing component.
  • the wavelength bands of the optical signals output by each of the multiplexed signal output ports are not adjacent.
  • the optical signals output by different multiplexed signal output ports contain the same number of bands.
  • the free-space wave division multiplexer has two multiplexed signal output ports, and the multiplexed signal input ports receive optical signals with wavelength bands ⁇ 1 to ⁇ 2n, where n is A natural number greater than 1, wherein the optical signals of odd-numbered bands are output through one of the multiplexed signal output ports, and the optical signals of even-numbered bands are output through the other said multiplexed signal output port.
  • the light receiving component further includes a coupler, and the optical signal output from each of the multiplexed signal output ports is coupled to the photonic integrated chip through the coupler; the photonic The integrated chip is also provided with coupling means that receives the optical signal from the coupler and transmits the optical signal to the wave division multiplexing means.
  • the coupling member is configured as an end face coupler, and the coupler is configured as one or more focusing lenses.
  • the wave division multiplexing component adopts any one of a cascaded MZI interferometer, an AWG structure, a stepped grating structure, and an inverse Bragg grating directional coupler demultiplexer.
  • the photonic integrated chip is also provided with a light detection component, and each optical signal emitted by the wave division multiplexing component is received by the light detection component and converted into an electrical signal output .
  • the free-space wave division multiplexer includes at least two thin-film filters arranged in free space, each of the thin-film filters constitutes a multiplexed signal output port, and each The thin film filters respectively filter the optical signals of different wave bands.
  • the free-space wave division multiplexer includes a light-transmitting fixed block, the light-transmissive fixed block has a first surface provided with the multiplexed signal input port and is provided with The second surface of the thin film filter, the first surface and the second surface parallel to each other;
  • a partial area of the first surface is provided with a high-reflection film, and the optical signal filtered and blocked by one of the thin-film filters is reflected to the high-reflection film, and is reflected by the high-reflection film to the other thin-film filter .
  • the multiplexing signal input port can receive two or more optical signals at the same time, and each optical signal is demultiplexed to a different multiplexing signal output port for output; and, from the Each optical signal output from the multiplexing signal output port is divided into optical signals of required wavelength bands by the wave division multiplexing component.
  • an embodiment of the present invention provides an optical module, which includes a housing and a circuit board packaged in the housing, the optical module also includes the light receiving component, and all the light receiving components of the light receiving component
  • the photonic integrated chip is electrically connected to the circuit board.
  • the beneficial effect of an embodiment of the present invention is that: by successively setting up a free-space wave division multiplexer and a photonic integrated chip with a wave-division multiplexing component along the optical path, the optical signal is first transmitted by the free space
  • the wave division multiplexer divides the wave, and at least one output port of the multiplexed signal has non-adjacent wavelength bands, and then the wave division multiplexing component in the photonic integrated chip is demultiplexed into the optical signal of the required band, combining the free space Advantages of the wavelength division multiplexer and photonic integrated chip, at least part of the adjacent bands in the optical signal have been demultiplexed before entering the photonic integrated chip, so as to achieve low cost, high integration and small size of the product while avoiding A series of problems such as high loss, crosstalk, low isolation, and inability to meet the flat-top requirements in specific bands caused by photonic integrated chips demultiplexing optical signals with adjacent bands greatly improve the overall effect of wave division multiplexing.
  • a series of problems such
  • Fig. 1 is a schematic diagram of the optical path of the light receiving component of the first embodiment of the present invention
  • FIGS. 2a-2d are various optional structural diagrams of the wave division multiplexing components of the photonic integrated chip in the light receiving component of the first embodiment of the present invention, and illustrate the wave division multiplexing of the optical signal Beam11 in Figure 1, wherein,
  • the WDM component shown in Figure 2a is a cascaded MZI interferometer
  • the WDM component shown in Figure 2b is an arrayed waveguide grating (AWG)
  • the WDM component shown in Figure 2c is a stepped grating (Echelle Grating)
  • the wave division multiplexing component shown in Figure 2d is a micro-ring (Micro-Ring) demultiplexer
  • AMG arrayed waveguide grating
  • Echelle Grating stepped grating
  • the wave division multiplexing component shown in Figure 2d is a micro-ring (Micro-Ring) demultiplexer
  • FIG. 3 is a schematic diagram of the optical path of the light receiving component of the second embodiment of the present invention.
  • Fig. 4 is a schematic diagram of the light path of the light receiving component according to the third embodiment of the present invention.
  • FIG. 1 shows a light receiving component according to a first embodiment of the present invention, which includes a free-space wave division multiplexer 10 and a photonic integrated chip 30 .
  • the free-space wavelength division multiplexer 10 is configured to demultiplex the received optical signal Beam1 into two optical signals Beam11, Beam12 or more optical signals.
  • the free-space wave division multiplexer 10 has a multiplexed signal input port 12 and at least two multiplexed signal output ports 13 .
  • the number of multiplexed signal output ports 13 illustrated in Figure 1 is two, which are respectively identified as multiplexed signal output ports 13 (a) and 13 (b) for the convenience of expression. As mentioned above, the number can be set to more indivual.
  • the multiplexing signal input port 12 can be used to receive an optical signal Beam1 having multiple adjacent wavelength bands.
  • the optical signal Beam1 shown in FIG. 1 has successively adjacent wavelength bands ⁇ 1, ⁇ 2, ⁇ 3 and so on.
  • the so-called “multiple adjacent wavebands" in the optical signal Beam1 in the present invention refers to the "adjacent" ordering relationship of multiple wavebands in order of size, for example, ⁇ 1 ⁇ 2 ⁇ 3, two phases
  • the wavelengths between adjacent bands can be closely connected or separated by wavelengths.
  • the multiplexing signal input port 12 receives the optical signal Beam1 with multiple adjacent wave bands
  • at least one multiplexing signal output port 13 outputs the optical signal
  • the wavelength bands are not adjacent—that is, for any two wavelength bands in the optical signal output by the at least one multiplexed signal output port 13, they are not adjacent wavelength bands in Beam1.
  • the two wavelength bands ⁇ 1 and ⁇ 3 in the optical signal Beam11 output by a multiplexed signal output port 13 ( a ) are not adjacent to each other in Beam1 but separated by the wavelength band ⁇ 2 .
  • the photonic integrated chip 30 is provided with a wavelength division multiplexing component 31 , and the optical signal output from the multiplexing signal output port 13 is divided into optical signals of required wavelength bands by the wavelength division multiplexing component 31 .
  • the optical signal Beam11 output from the multiplexing signal output port 13 (a) contains the wavelength bands ⁇ 1 and ⁇ 3, and the optical signal Beam11 is divided into optical signals B111 and ⁇ 1 having the wavelength bands ⁇ 1 and Signal B112 with band ⁇ 3.
  • the optical signal Beam1 is first transmitted by the free space
  • the wave division multiplexer 10 demultiplexes the waves, and the wavelength bands output by at least one multiplexed signal output port 13 are not adjacent, and then the wave demultiplexing components 31 in the photonic integrated chip 30 are demultiplexed into optical signals of the required wave bands,
  • Combining the advantages of the free-space wavelength division multiplexer 10 and the photonic integrated chip 30, at least part of the adjacent wavebands in the optical signal have been demultiplexed before entering the photonic integrated chip 30, so as to achieve low-cost, high-integration products
  • the photonic integrated chip 30 demultiplexes optical signals with adjacent bands (such as ⁇ 1 and ⁇ 2) to avoid high loss, crosstalk, low isolation, and failure to meet the flat-top requirements in specific bands
  • the wavelength bands of the output optical signals of each multiplexed signal output port 13 are not adjacent.
  • the optical signal Beam11 output by one multiplexed signal output port 13 (a) has non-adjacent bands—for example, the bands ⁇ 1 and ⁇ 3, and the other multiplexed signal output port 13 ( b)
  • the wavelength bands of the output optical signal Beam12 are not adjacent—for example, the wavelength bands ⁇ 2 and ⁇ 4.
  • any adjacent waveband in the optical signal Beam1 is output through different multiplexed signal output ports 13, and then, when the aforementioned optical signal Beam11 is formed by the waveband
  • the demultiplexing component 31 is divided into the optical signal B111 having the wavelength band ⁇ 1 and the signal B112 having the wavelength band ⁇ 3
  • the optical signal Beam12 output from the multiplexing signal output port 13 (b) is divided by the wavelength demultiplexing component 31 into the optical signal B112 having the wavelength band
  • the optical signal B121 with ⁇ 2 and the optical signal B122 with the wavelength band ⁇ 4 so that any adjacent wavelength band in the optical signal Beam1 has been demultiplexed before reaching the photonic integrated chip 30, further improving the wave decomposition with high isolation, low insertion loss and low cost Reuse effect.
  • the optical signals output by different multiplexed signal output ports 13 contain the same number of bands.
  • the number of the multiplexed signal output port 13 is set to two as mentioned above, and the optical signal Beam1 with the wavelength band ⁇ 1 to ⁇ 2n received by the multiplexed signal input port 12, n is greater than 1 Natural numbers, wherein the optical signals Beam11 of the odd-numbered bands ⁇ 1, ⁇ 3... are output through the multiplexed signal output port 13(a), while the optical signals Beam12 of the even-numbered bands ⁇ 2, ⁇ 4... are output through the multiplexed signal output port 13(b).
  • the number of bands contained in the optical signal output by each multiplexed signal output port may be 3 or more, for example, the optical signal Beam1 in Fig. 1 is changed to have bands ⁇ 1, ⁇ 2, ⁇ 3, ⁇ 4 , ⁇ 5 and ⁇ 6, the optical signal Beam11 after demultiplexing can have the bands ⁇ 1, ⁇ 3 and ⁇ 5, and the optical signal Beam12 can have the bands ⁇ 2, ⁇ 4 and ⁇ 6;
  • the number of 13 is set to be more, such as 3, and the optical signals with the bands ⁇ 1 to ⁇ 3n received by the multiplexing signal input port 12, n is a natural number greater than 1, and the optical signals of the bands ⁇ 1, ⁇ 4...
  • the multiplexed signal output port 13 is output, and the optical signals of the bands ⁇ 2, ⁇ 5... are output through another multiplexed signal output port 13, and the optical signals of the bands ⁇ 3, ⁇ 6... are output through another multiplexed signal output port 13; thus By analogy, no more details.
  • the number of bands contained in the optical signals output by different multiplexed signal output ports 13 may be different, for example, the optical signal Beam1 has three bands ⁇ 1, ⁇ 2, ⁇ 3, the optical signal bands output by one multiplexed signal output port 13 are not adjacent to each other—the bands ⁇ 1 and ⁇ 3, while the optical signal output by the other multiplexed signal output port 13 is the band ⁇ 2; or, partially multiplexed
  • the wavelength bands of the optical signals output by the signal output port 13 are not adjacent and the wavelength bands of the remaining multiplexed signal output ports 13 output optical signals are adjacent.
  • the optical signal Beam1 has four bands ⁇ 1, ⁇ 2, ⁇ 3 and ⁇ 4, and one multiplexing
  • the optical signal output from the signal output port 13 has non-adjacent wavelength bands—the wavelength bands ⁇ 1 and ⁇ 4, while the optical signal output from the other multiplexed signal output port 13 has adjacent wavelength bands—the wavelength bands ⁇ 2 and ⁇ 3.
  • the wave division multiplexer 10 in free space includes two thin-film filters arranged in free space, each of the thin-film filters constitutes a multiplexed signal output port 13, and each of the thin-film filters is respectively connected to Optical signals of different wavelength bands are filtered.
  • the number of thin-film filters illustrated in this embodiment is two, and when the number of multiplexed signal output ports 13 is set to be more, Then the number of the corresponding thin-film filters is more.
  • the free-space WDM 10 includes a light-transmitting fixed block 11 .
  • the light-transmitting fixed block 11 has a first surface 101 provided with a multiplexing signal input port 12 and a second surface 102 provided with the thin film filter; the first surface 101 and the second surface 102 are parallel and opposite, and are parallel to the free space
  • the optical signal Beam1 received by the wave division multiplexer 10 forms an acute angle.
  • a part of the first surface 101 is provided with a high reflection film 14, and the optical signal filtered and blocked by one of the thin film filters (such as the thin film filter configured as a multiplexed signal output port 13 (a) in the figure) is reflected to the high reflection film 14, and is reflected by the high-reflection film 14 to another thin-film filter (such as the thin-film filter configured as the multiplexing signal output port 13 (b) in the figure).
  • the thin film filters such as the thin film filter configured as a multiplexed signal output port 13 (a) in the figure
  • the light-transmitting fixed block 11 and the thin film filter described above are only a specific structure in the form of a Z-block of the wave division multiplexer 10 in free space, which is TFF (English full name Thin Film Filter, thin film filter ) type wavelength division multiplexer.
  • TFF Thin Film Filter, thin film filter
  • the specific implementation of the free-space WDM 10 is not limited thereto.
  • the photonic integrated chip 30 is also provided with a photodetection component 33 .
  • Each of the optical signals emitted via the wave division multiplexing component 31 such as B111 , B112 , B121 and B122 , is received by the light detection component 33 and converted into an electrical signal for output.
  • the photoelectric signal is converted by the photodetection component 33 of the photonic integrated chip 30 , so that the light receiving component has the advantages of high wavelength band detection, fast response speed and high integration.
  • the photodetection component 33 may include a plurality of photodetection elements arranged in an array, and the number of these photodetection elements is no less than the number of wavelength bands contained in the optical signal Beam1 received by the multiplexing signal input port 12, for example, the optical signal Beam1 in FIG. 1
  • the light receiving component further includes a coupler 20 disposed between the wave division multiplexer 10 and the photonic integrated chip 30 in free space.
  • the optical signal output by each multiplexed signal output port 13 is coupled to the photonic integrated chip 30 via the coupler 20 .
  • the photonic integrated chip 30 is also provided with a coupling member 32 .
  • the coupling component 32 receives the optical signal from the coupler 20 , and transmits the optical signal to the wavelength division multiplexing component 31 , and transmits the optical signal to the optical detection component 33 after being demultiplexed by the wavelength division multiplexing component 31 .
  • the coupling member 32 is configured as an end-face coupler, such as a speckle converter or the like.
  • the coupler 20 is configured as one or more focusing lenses, such as convex lenses or plano-convex lenses. In this way, the optical signal output by each multiplexed signal output port 13 is focused and coupled to the coupling component 32 of the photonic integrated chip 30 via the coupler 20 , and then coupled to the wave division multiplexing component 31 through the coupling component 32 .
  • the coupling member 32 implemented as an end-face coupler and the coupler 20 implemented as a focusing lens introduced here are only the wave division multiplexer 10 and the wave division multiplexer 31 on the photonic integrated chip 30 in the present invention.
  • the coupling mode between the free-space WDM 10 and the WDM component 31 on the photonic integrated chip 30 is not limited thereto.
  • the wave-division multiplexing component 31 on the photonic integrated chip 30 includes several wave-division multiplexing units 311, and the number of the wave-division multiplexing units 311 is illustrated as two in the figure and is equal to the number of multiplexed signal output ports 13. unanimous. In this way, each wavelength division multiplexing unit 311 can be used to receive the optical signal output by the corresponding multiplexed signal output port 13 .
  • the specific structure of the wavelength division multiplexing unit 311 can adopt the cascaded MZI interferometer shown in Figure 2a, or the AWG structure shown in Figure 2b, or the stepped grating structure shown in Figure 2c, or the structure shown in Figure 2d
  • the shown reverse Bragg grating directional coupler type demultiplexer, or other wave demultiplexing structures known in the art can be used.
  • the light-receiving component of this embodiment has the following beneficial effects: by sequentially setting the wave division multiplexer 10 in free space along the optical path, and the photonic integrated chip 30 provided with the wave division multiplexing component 31, the optical signal Beam1 first It is demultiplexed by the wave division multiplexer 10 in free space, and the wavelength bands output by at least one multiplexed signal output port 13 are not adjacent, and then demultiplexed into the required wave bands by the wave division multiplexing member 31 in the photonic integrated chip 30
  • the optical signal of the optical signal combines the advantages of the free-space wave division multiplexer 10 and the photonic integrated chip 30.
  • At least part of the adjacent wave bands in the optical signal have been demultiplexed before entering the photonic integrated chip 30, so that the incoming wave can be decomposed
  • the wavelength interval of the optical signal of the multiplexing component 31 is larger, and it is easier to decompose.
  • a series of problems such as flat-top requirements greatly improve the overall effect of WDM, and then achieve high isolation, low insertion loss, and low-cost WDM effects.
  • Fig. 3 has shown the light-receiving assembly of the second embodiment of the present invention, and it also comprises the wavelength division multiplexer 10 of free space, coupler 20 and photonic integrated chip 30, and photonic integrated chip 30 is provided with coupling member 32, wavelet too. Demultiplexing means 31 and light detecting means 33 .
  • the number of multiplexed signal output ports 13 is two, and the optical signal Beam1 with the bands ⁇ 1 to ⁇ 2n received by the multiplexed signal input port 12, wherein the odd-numbered bands ⁇ 1, ⁇ 3
  • the optical signal Beam11 of ... is output through the multiplexing signal output port 13 (a), while the optical signal Beam12 of the even-numbered bands ⁇ 2, ⁇ 4 ... is output through the multiplexing signal output port 13 (b);
  • the number of multiplexed signal output ports 13 is three, respectively identified as multiplexed signal output ports 13 ( a ), 13 ( b ) and 13 ( c );
  • the optical signal Beam1 with six bands ⁇ 1, ⁇ 2, ⁇ 3, ⁇ 4, ⁇ 5, and ⁇ 6 received by the multiplexed signal input port 12 is evenly divided into three multiplexed signal output ports 13 for output, wherein the multiplexed signal output port 13(a) outputs the optical signal Beam11 with the bands ⁇ 1 and ⁇ 4, the multiplexed signal output port 13(b) outputs the optical signal Beam12 with the bands ⁇ 2 and ⁇ 5, and the multiplexed signal output port 13(c) outputs the optical signal with the bands ⁇ 3 and ⁇ 6
  • the number of WDM elements 311 of the WDM component 31 on the photonic integrated chip 30 corresponds to change to three; and, corresponding to the number of wavebands contained in the optical signal Beam1 received by the wave division multiplexer 10 in free space, the number of photodetection elements of the photodetection member 33 on the photonic integrated chip 30 changes accordingly as six.
  • This second embodiment actually provides a variation implementation situation in which the number of multiplexed signal output ports 13 of the first embodiment is increased.
  • the multiplexed signal output in the wave division multiplexer 10 of the free space of the present invention can also be set to be more, such as four, and the examples in the drawings are no longer provided.
  • Fig. 4 has shown the light-receiving component of the third embodiment of the present invention, and it also comprises the wavelength division multiplexer 10 of free space, coupler 20 and photonic integrated chip 30, and photonic integrated chip 30 is provided with coupling member 32, wavelet too. Demultiplexing means 31 and light detecting means 33 .
  • the multiplexing signal input port 12 receives one optical signal Beam1, and the optical receiving component performs wave division multiplexing on the optical signal Beam1;
  • the multiplexing signal input port 12 can receive two or more optical signals at the same time, and the optical receiving component separately performs wave division multiplexing on each optical signal.
  • the optical receiving component separately performs wave division multiplexing on each optical signal.
  • two wavelength division multiplexers 10 arranged side by side may also be used to demultiplex the two optical signals respectively.
  • the multiplexing signal input port 12 can simultaneously receive two optical signals Beam1 and Beam2; the optical signal Beam1 is demultiplexed to different multiplexing signal output ports 13 for output, For example, the optical signal Beam11 with the bands ⁇ 1 and ⁇ 3 is output from the multiplexed signal output port 13(a), and the optical signal Beam12 with the bands ⁇ 2 and ⁇ 4 is output from the multiplexed signal output port 13(b); the optical signal Beam2 is demultiplexed to Different multiplexed signal output ports 13 output, for example, output the optical signal Beam21 with the bands ⁇ 1 and ⁇ 3 from the multiplexed signal output port 13(a), and output the optical signals with the bands ⁇ 2 and ⁇ 4 from the multiplexed signal output port 13(b).
  • Optical signal Beam22 for example, output the optical signal Beam21 with the bands ⁇ 1 and ⁇ 3 from the multiplexed signal output port 13(a), and output the optical signals with the bands ⁇ 2 and ⁇ 4
  • each optical signal output from the multiplexing signal output port 13 is divided into optical signals of required wavelength bands by the wave division multiplexing component 31, for example: two optical signals Beam11 output from the multiplexing signal output port 13 (a) and Beam21, wherein the optical signal Beam11 is divided into an optical signal B111 with a wavelength band ⁇ 1 and an optical signal B112 with a wavelength band ⁇ 3 by a wavelength division multiplexing component 31, and the optical signal Beam21 is divided into optical signals Beam211 and a wavelength band ⁇ 1 by a wavelength division multiplexing component 31 An optical signal Beam212 with a wavelength band ⁇ 3; two optical signals Beam12 and Beam22 output from the multiplexed signal output port 13(b), wherein the optical signal Beam12 is divided into an optical signal B121 with a wavelength band ⁇ 2 and an optical signal with a wavelength band
  • the optical signal B122 of ⁇ 4 the optical signal Beam22 is divided into the optical signal Beam221 having the wavelength band ⁇ 2 and the optical signal Beam222 having
  • the number of photodetection elements of the photodetection component 33 on the photonic integrated chip 30 is the same as the number of all wavelength bands contained in each path of the optical signal Beam received by the wave division multiplexer 10 in free space.
  • the multiplexing signal input port 12 can receive two optical signals Beam1 and Beam2 at the same time, and in a variant implementation, the multiplexing signal input port 12 can also receive more optical signals at the same time, and the corresponding wave decomposition
  • the multiplexing process is analogized with reference to FIG. 4 , and will not be described in detail.
  • the technical principle of the third embodiment can also be applied to the variant implementation of the aforementioned second embodiment.
  • the multiplexing signal input port 12 is changed to be capable of simultaneously receiving two or For the above optical signals, the optical receiving component separately performs wave division multiplexing on each optical signal.
  • the fourth embodiment provides an optical module, which includes a casing, a circuit board, and a light receiving component, and the circuit board and the light receiving component are packaged in the casing.
  • the light receiving component adopts the light receiving component of any one of the first embodiment to the third embodiment above, and the photonic integrated chip of the light receiving component is electrically connected to the circuit board.
  • the optical signal received by the optical module is demultiplexed by the free-space wavelength division multiplexer of the optical receiving component, it is coupled into the photonic integrated chip, and is demultiplexed by the wavelength division multiplexer of the photonic integrated chip. After further demultiplexing by the component, it is converted into an electrical signal by the photodetection component of the photonic integrated chip, and then the electrical signal is transmitted to the circuit board, and after being processed by the circuit board, it is processed by the electrical interface of the optical module output.

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Abstract

一种光接收组件及光模块。所述光接收组件包括：自由空间的波分解复用器（10），其具有复用信号输入端口（12）和至少两个复用信号输出端口（13），当复用信号输入端口（12）接收具有多个相邻波段的光信号时，至少一个复用信号输出端口（13）输出光信号的波段不相邻；光子集成芯片（30），其设有波分解复用构件（31），从复用信号输出端口（13）输出的光信号由波分解复用构件（31）分成所需波段的光信号。该光接收组件结合了自由空间的波分解复用器（10）和光子集成芯片（30）的优势，光信号中的至少部分相邻波段在进入光子集成芯片（30）之前已经提前分波，避免因光子集成芯片（30）对具有相邻波段的光信号进行分波而具有的损耗高、串扰、隔离度低等问题，达到高隔离度、低插损、低成本的波分解复用效果。

Description

光接收组件及光模块 技术领域
本发明属于光通信技术领域，具体涉及一种光接收组件及光模块。
 背景技术
随着当今信息社会的不断发展，人们对光传输的容量和带宽的需求呈指数型增长，对大容量光互连的需求迅速增长。众所周知，波分复用(WDM)技术是用于提高光通信容量的有效手段。
在光接收组件中的波分解复用方面，传统自由空间波分解复用构件具有隔离度高的优点，但由于镀膜成本、人工成本的影响，而使得采用自由空间波分解复用构件的光接收组件的成本高。
光子集成芯片中集成波分解复用构件、调制器和高速光探测器、激光器等重要器件，不仅能够实现波分解复用，而且可以有效缩小光模块的体积，提高集成度。但是，光子集成芯片的波分解复用构件中，中心波长会随着光波导的宽度、高度、倾角以及周围环境温度的变化而变化，而由于实际加工难度的影响，使得光波导的不同位置处的宽度、高度和倾角不同，且周围环境温度也不同，导致光子集成芯片的波分解复用效果不理想，存在损耗高、串扰、隔离度低的劣势，且无法满足光模块在解复用方面关于在特定波段内平顶的要求。
 技术问题
本发明的目的在于提供一种光接收组件及光模块，在波分解复用方面达到高隔离度、低插损、低成本的综合效果。
 技术解决方案
为实现上述发明目的，本发明一实施方式提供一种光接收组件，包括：
自由空间的波分解复用器，其具有复用信号输入端口和至少两个复用信号输出端口，当所述复用信号输入端口接收具有多个相邻波段的光信号时，至少一个所述复用信号输出端口输出光信号的波段不相邻；以及，
光子集成芯片，其设有波分解复用构件，从所述复用信号输出端口输出的光信号由所述波分解复用构件分成所需波段的光信号。
作为本发明一实施方式的进一步改进，每个所述复用信号输出端口输出光信号的波段不相邻。
作为本发明一实施方式的进一步改进，不同的所述复用信号输出端口所输出的光信号所含波段数目相同。
作为本发明一实施方式的进一步改进，所述自由空间的波分解复用器具有两个复用信号输出端口，所述复用信号输入端口所接收的具有波段λ1至λ2n的光信号，n为大于1的自然数，其中的奇数波段的光信号经由其一所述复用信号输出端口输出，偶数波段的光信号经由另一所述复用信号输出端口输出。
作为本发明一实施方式的进一步改进，所述光接收组件还包括耦合器，从每个所述复用信号输出端口输出的光信号经由所述耦合器耦合至所述光子集成芯片；所述光子集成芯片还设有耦合构件，所述耦合构件接收来自所述耦合器的光信号并将光信号传输至所述波分解复用构件。
作为本发明一实施方式的进一步改进，所述耦合构件设置为端面耦合器，所述耦合器设置为一个或多个聚焦透镜。
作为本发明一实施方式的进一步改进，所述波分解复用构件采用级联MZI型干涉仪、AWG结构、阶梯型光栅结构、反向布拉格光栅定向耦合器型解复用器的任一种。
作为本发明一实施方式的进一步改进，所述光子集成芯片还设有光探测构件，每个经由所述波分解复用构件出射的光信号均被所述光探测构件接收并转换成电信号输出。
作为本发明一实施方式的进一步改进，所述自由空间的波分解复用器包括自由空间设置的至少两个薄膜滤波片，每个所述薄膜滤波片构成一个所述复用信号输出端口，各个所述薄膜滤波片分别对不同波段的光信号进行滤波。
作为本发明一实施方式的进一步改进，所述自由空间的波分解复用器包括透光固定块，所述透光固定块具有设置有所述复用信号输入端口的第一表面和设置有所述薄膜滤波片的第二表面，所述第一表面和所述第二表面平行相对；
所述第一表面的部分区域设有高反射膜，一个所述薄膜滤波片所过滤阻隔的光信号反射至所述高反射膜，并被所述高反射膜反射至另一所述薄膜滤波片。
作为本发明一实施方式的进一步改进，所述复用信号输入端口可以同时接收两路或以上的光信号，每路光信号分波至不同的所述复用信号输出端口输出；且，从所述复用信号输出端口输出的各路光信号分别由所述波分解复用构件分成所需波段的光信号。
为实现上述发明目的，本发明一实施方式提供一种光模块，包括壳体和封装于所述壳体内的电路板，所述光模块还包括所述光接收组件，所述光接收组件的所述光子集成芯片与所述电路板电连接。
 有益效果
与现有技术相比，本发明一实施方式的有益效果在于：通过沿光路依次设置自由空间的波分解复用器、设有波分解复用构件的光子集成芯片，光信号先被自由空间的波分解复用器分波，并且至少一个复用信号输出端口输出的波段不相邻，然后再由光子集成芯片中的波分解复用构件分波成所需波段的光信号，结合了自由空间的波分解复用器和光子集成芯片的优势，光信号中的至少部分相邻波段在进入光子集成芯片之前已经提前分波，从而实现产品的低成本、高集成度和小体积的同时，避免因光子集成芯片对具有相邻波段的光信号进行分波而导致的损耗高、串扰、隔离度低、无法满足特定波段内平顶要求等一系列问题，大大改善波分解复用的整体效果，进而达到高隔离度、低插损、低成本的波分解复用效果。
 附图说明
后文将参照附图以示例性而非限制性的方式详细描述本发明的一些具体实施方式。附图中以相同的附图标记标示了相同或类似的部件或部分。本领域技术人员应该理解，这些附图未必是按比例绘制的。
图1是本发明第一实施例的光接收组件的光路示意图；
图2a~2d是本发明第一实施例的光接收组件中光子集成芯片的波分解复用构件的各种可选结构示意图，并示例了图1中光信号Beam11的波分解复用，其中，图2a中示例的波分解复用构件为级联MZI型干涉仪，图2b中示例的波分解复用构件为阵列波导光栅（AWG），图2c中示例的波分解复用构件为阶梯型光栅（Echelle Grating），图2d中示例的波分解复用构件为微环型（Micro-Ring）解复用器；
图3是本发明第二实施例的光接收组件的光路示意图；
图4是本发明第三实施例的光接收组件的光路示意图。
 本发明的实施方式
以下将结合附图所示的具体实施方式对本发明进行详细描述。但这些实施方式并不限制本发明，本领域的普通技术人员根据这些实施方式所做出的结构、方法、或功能上的变换均包含在本发明的保护范围内。
第一实施例
图1示出了本发明第一实施例的光接收组件，其包括自由空间的波分解复用器10和光子集成芯片30。
自由空间的波分解复用器10设置为将所接收的光信号Beam1分波为两束光信号Beam11、Beam12或更多束光信号。具体地，自由空间的波分解复用器10具有复用信号输入端口12和至少两个复用信号输出端口13。在图1中示例的复用信号输出端口13数目为两个，为便于表述分别标识为复用信号输出端口13（a）和13（b），如前所述，其数目可以设置为更多个。
其中，复用信号输入端口12可以用于接收具有多个相邻波段的光信号Beam1，例如，图1中所示光信号Beam1具有依次相邻的波段λ1、λ2、λ3等。需要说明的是，本发明中该光信号Beam1中的所谓“多个相邻波段”，指的是多个波段按照大小顺序的排序关系“相邻”，例如λ1＜λ2＜λ3，两个相邻波段之间可以是波长紧连也可以是波长间隔开。
并且，当复用信号输入端口12接收到具有多个相邻波段的光信号Beam1时，经过所述自由空间的波分解复用器的解复用，至少一个复用信号输出端口13输出光信号的波段不相邻——也即，对于该至少一个复用信号输出端口13所输出的光信号中的任意两个波段而言，在Beam1中并非是相邻波段。例如，一个复用信号输出端口13（a）所输出的光信号Beam11中的两个波段λ1和λ3，在Beam1中并非相邻波段而是由波段λ2间隔开。
光子集成芯片30设有波分解复用构件31，从复用信号输出端口13所输出的光信号由波分解复用构件31分成所需波段的光信号。例如，图1中所示，从复用信号输出端口13（a）所输出的光信号Beam11含有波段λ1和λ3，该光信号Beam11由波分解复用构件31分成具有波段λ1的光信号B111和具有波段λ3的信号B112。
如此，本发明的所述光接收组件中，通过沿光路依次设置的自由空间的波分解复用器10、集成有波分解复用构件31的光子集成芯片30，光信号Beam1先被自由空间的波分解复用器10分波，并且至少一个复用信号输出端口13输出的波段不相邻，然后再由光子集成芯片30中的波分解复用构件31分波成所需波段的光信号，结合了自由空间的波分解复用器10和光子集成芯片30的优势，光信号中的至少部分相邻波段在进入光子集成芯片30之前已经提前分波，从而在实现产品的低成本、高集成度和小体积的同时，避免因光子集成芯片30对具有相邻波段（例如λ1和λ2）的光信号进行分波而导致的损耗高、串扰、隔离度低、无法满足特定波段内平顶要求等一系列问题，大大改善波分解复用的整体效果，进而达到高隔离度、低插损、低成本的波分解复用效果。
在一优选实施中，每个复用信号输出端口13各自输出光信号的波段不相邻。例如，在图1的所示光信号Beam1，一个复用信号输出端口13（a）输出的光信号Beam11波段不相邻——例如为波段λ1和λ3，且另一个复用信号输出端口13（b）输出的光信号Beam12波段也不相邻——例如为波段λ2和λ4。也就是说，在自由空间的波分解复用器10的解复用作用下，光信号Beam1中任意相邻波段经由不同的复用信号输出端口13输出，进而，在前述的光信号Beam11由波分解复用构件31分成具有波段λ1的光信号B111和具有波段λ3的信号B112的同时，从复用信号输出端口13（b）所输出的光信号Beam12则由波分解复用构件31分成具有波段λ2的光信号B121和具有波段λ4的光信号B122，从而实现光信号Beam1中任意相邻波段在到达光子集成芯片30之前已经分波，进一步提升高隔离度、低插损、低成本的波分解复用效果。
再优选地，不同的复用信号输出端口13所输出的光信号所含波段数目相同。例如图1所示实施例，复用信号输出端口13的数目如前所述的设置为两个，复用信号输入端口12所接收的具有波段λ1至λ2n的光信号Beam1，n为大于1的自然数，其中的奇数波段λ1、λ3…的光信号Beam11经由复用信号输出端口13（a）输出，而偶数波段λ2、λ4…的光信号Beam12经由复用信号输出端口13（b）输出。当然，在一变化实施例中，每个复用信号输出端口所输出的光信号所含波段数可以为3或以上，比如图1中光信号Beam1变化实施为具有波段λ1、λ2、λ3、λ4、λ5和λ6，在分波后的光信号Beam11可以具有波段λ1、λ3和λ5，而光信号Beam12可以具有波段λ2、λ4和λ6；或者，在再一变化实施例中，复用信号输出端口13的数目设置为更多个，比如3个，复用信号输入端口12所接收的具有波段λ1至λ3n的光信号，n为大于1的自然数，其中的波段λ1、λ4…的光信号经由一个复用信号输出端口13输出，而波段λ2、λ5…的光信号经由另一复用信号输出端口13输出，而波段λ3、λ6…的光信号经由再一个复用信号输出端口13输出；以此类推，不再赘述。
可以理解的，除前文举例示意的实施例之外，在其它变化实施例中：不同的复用信号输出端口13所输出的光信号所含波段数目可以不同，例如，光信号Beam1具有三个波段λ1、λ2、λ3，一个复用信号输出端口13输出的光信号波段不相邻——为波段λ1和λ3，而另一个复用信号输出端口13输出的光信号为波段λ2；或者，部分复用信号输出端口13输出光信号的波段不相邻而其余部分复用信号输出端口13输出光信号的波段相邻，例如，光信号Beam1具有四个波段λ1、λ2、λ3和λ4，一个复用信号输出端口13输出的光信号波段不相邻——为波段λ1和λ4，而另一个复用信号输出端口13输出的光信号波段相邻——为波段λ2和λ3。这些变化实施未脱离本发明的技艺宗旨。在本实施例中，自由空间的波分解复用器10包括自由空间设置的两个薄膜滤波片，每个所述薄膜滤波片构成一个复用信号输出端口13，各个所述薄膜滤波片分别对不同波段的光信号进行滤波。可以理解的，与复用信号输出端口13的数目相对应的，该实施例中示例的所述薄膜滤波片数目是两个，而在复用信号输出端口13的数目设置为更多个时，则相应的所述薄膜滤波片数目也是更多个。
更具体地，在本实施例中，自由空间的波分解复用器10包括透光固定块11。透光固定块11具有设置有复用信号输入端口12的第一表面101和设置有所述薄膜滤波片的第二表面102；第一表面101和第二表面102平行相对，并且与自由空间的波分解复用器10所接收的光信号Beam1呈锐角夹角。
第一表面101的部分区域设有高反射膜14，一个所述薄膜滤波片（如图中构造为复用信号输出端口13（a）的薄膜滤波片）所过滤阻隔的光信号反射至高反射膜14，并被高反射膜14反射至另一所述薄膜滤波片（如图中构造为复用信号输出端口13（b）的薄膜滤波片）。
以上介绍的透光固定块11及所述薄膜滤波片，仅为自由空间的波分解复用器10的一种Z-block形式的具体结构，其为TFF（英文全称Thin Film Filter，薄膜滤波器）型波分复用器。而自由空间的波分解复用器10的具体实现方式不限于此。
进一步地，光子集成芯片30还设有光探测构件33。每个经由波分解复用构件31出射的光信号，例如B111、B112、B121和B122，均被光探测构件33接收并转换成电信号输出。如此，通过光子集成芯片30的光探测构件33对光电信号转换，使得所述光接收组件具有波段探测度高、响应速度快且集成度高的优点。
其中，光探测构件33可以包括呈阵列排布的多个光探测元件，这些光探测元件的数目不少于复用信号输入端口12所接收的光信号Beam1所含波段数目，例如图1中光探测元件设置为4个并分别对光信号B111、B112、B121和B122进行探测和光电转换。
在本实施例中，所述光接收组件还包括耦合器20，其设置在自由空间的波分解复用器10和光子集成芯片30之间。每个复用信号输出端口13输出的光信号经由耦合器20耦合至光子集成芯片30。
光子集成芯片30还设有耦合构件32。耦合构件32接收来自耦合器20的光信号、并将光信号传输至波分解复用构件31，经波分解复用构件31分波后传输至光探测构件33。
具体地，耦合构件32设置为端面耦合器，如模斑变换器等。耦合器20设置为一个或者多个聚焦透镜，例如凸透镜或平凸透镜等。如此，每个复用信号输出端口13输出的光信号经由耦合器20聚焦耦合到光子集成芯片30的耦合构件32上，在通过耦合构件32耦合到波分解复用构件31中。当然，此处介绍的实施为端面耦合器的耦合构件32和实施为聚焦透镜的耦合器20仅为本发明中自由空间的波分解复用器10和光子集成芯片30上波分解复用构件31之间耦合方式的一种具体示例，自由空间的波分解复用器10和光子集成芯片30上波分解复用构件31之间耦合方式不限于此。
进一步地，光子集成芯片30上的波分解复用构件31包括若干波分解复用单元311，波分解复用单元311的数目在图中示例为两个并与复用信号输出端口13的数目相一致。如此，每个波分解复用单元311可以用于接收相对应的复用信号输出端口13所输出的光信号。
波分解复用单元311的具体结构可以采用图2a所示的级联MZI型干涉仪、或采用图2b所示的AWG结构、或采用图2c所示的阶梯型光栅结构、或者采用图2d所示的反向布拉格光栅定向耦合器型解复用器，又或者可以采用本领域已知的其它波分解复用结构。
综上所述，本实施例的光接收组件具有如下有益效果：通过沿光路依次设置自由空间的波分解复用器10、设有波分解复用构件31的光子集成芯片30，光信号Beam1先被自由空间的波分解复用器10分波，并且至少一个复用信号输出端口13输出的波段不相邻，然后再由光子集成芯片30中的波分解复用构件31分波成所需波段的光信号，结合了自由空间的波分解复用器10和光子集成芯片30的优势，光信号中的至少部分相邻波段在进入光子集成芯片30之前已经提前分波，这样可以使进入波分解复用构件31的光信号波段间隔更大，更容易进行分解。从而实现产品的低成本、高集成度和小体积的同时，避免因光子集成芯片30对具有相邻波段的光信号进行分波而导致的损耗高、串扰、隔离度低、无法满足特定波段内平顶要求等一系列问题，大大改善波分解复用的整体效果，进而达到高隔离度、低插损、低成本的波分解复用效果。
第二实施例
图3示出了本发明第二实施例的光接收组件，其同样包括自由空间的波分解复用器10、耦合器20和光子集成芯片30，光子集成芯片30同样设有耦合构件32、波分解复用构件31和光探测构件33。
该第二实施例和前述第一实施例的区别仅在于：
在前第一实施例的图1示例中，复用信号输出端口13的数目为两个，复用信号输入端口12所接收的具有波段λ1至λ2n的光信号Beam1，其中的奇数波段λ1、λ3…的光信号Beam11经由复用信号输出端口13（a）输出，而偶数波段λ2、λ4…的光信号Beam12经由复用信号输出端口13（b）输出；
而在该第二实施例中，如图3所示，复用信号输出端口13的数目为三个，分别标识为复用信号输出端口13（a）、13（b）和13（c）；复用信号输入端口12所接收的具有六个波段λ1、λ2、λ3、λ4、λ5、λ6的光信号Beam1，均匀分波到三个复用信号输出端口13处输出，其中复用信号输出端口13（a）输出具有波段λ1、λ4的光信号Beam11，复用信号输出端口13（b）输出具有波段λ2、λ5的光信号Beam12，复用信号输出端口13（c）输出具有波段λ3、λ6的光信号Beam13；
并且，在该第二实施例中，与自由空间的波分解复用器10所输出的光信号数目相对应的，光子集成芯片30上波分解复用构件31的波分解复用元件311数目相应变化为三个；以及，与自由空间的波分解复用器10所接收的光信号Beam1中所含波段的数目相对应的，光子集成芯片30上光探测构件33的光探测元件数目相应变化为六个。
该第二实施例实际上提供了第一实施例的复用信号输出端口13的数目增多的一种变化实施情况，当然，本发明的自由空间的波分解复用器10中的复用信号输出端口13的数目还可以设为更多个，比如四个，不再提供附图示例。
第三实施例
图4示出了本发明第三实施例的光接收组件，其同样包括自由空间的波分解复用器10、耦合器20和光子集成芯片30，光子集成芯片30同样设有耦合构件32、波分解复用构件31和光探测构件33。
该第三实施例和前述第一实施例的区别仅在于：
在前第一实施例的图1示例中，复用信号输入端口12接收一路光信号Beam1，所述光接收组件对该路光信号Beam1进行波分解复用；
而在该第三实施例中，如图4所示，复用信号输入端口12可以同时接收两路或以上的光信号，所述光接收组件对每一路光信号分别进行波分解复用。当然，在其它实施例中，也可以采用两个并排排列的波分解复用器10分别对两路光信号进行解复用。
具体地，在该第三实施例中，如图4所示，复用信号输入端口12可以同时接收两路光信号Beam1和Beam2；光信号Beam1分波至不同的复用信号输出端口13输出，比如从复用信号输出端口13（a）输出具有波段λ1、λ3的光信号Beam11、并且从复用信号输出端口13（b）输出具有波段λ2、λ4的光信号Beam12；光信号Beam2分波至不同的复用信号输出端口13输出，比如从复用信号输出端口13（a）输出具有波段λ1、λ3的光信号Beam21、并且从复用信号输出端口13（b）输出具有波段λ2、λ4的光信号Beam22。
并且，从复用信号输出端口13输出的各路光信号分别由波分解复用构件31分成所需波段的光信号，比如：从复用信号输出端口13（a）输出的两路光信号Beam11和Beam21，其中光信号Beam11由波分解复用构件31分成具有波段λ1的光信号B111和具有波段λ3的光信号B112，光信号Beam21由波分解复用构件31分成具有波段λ1的光信号Beam211和具有波段λ3的光信号Beam212；从复用信号输出端口13（b）输出的两路光信号Beam12和Beam22，其中光信号Beam12由波分解复用构件31分成具有波段λ2的光信号B121和具有波段λ4的光信号B122，光信号Beam22由波分解复用构件31分成具有波段λ2的光信号Beam221和具有波段λ4的光信号Beam222。
另外，光子集成芯片30上光探测构件33的光探测元件数目，与自由空间的波分解复用器10所接收的各路光信号Beam中全部所含波段的数目相同。
当然，图4示例中，复用信号输入端口12可以同时接收两路光信号Beam1和Beam2，而在变化实施中，复用信号输入端口12也可以同时接收更多路光信号，相应的波分解复用过程参图4进行类推，不再详述。
再者，该第三实施例的技艺宗旨也可以应用于前述第二实施例的变化实施，同样的，在第二实施例的基础上，复用信号输入端口12变化为可以同时接收两路或以上的光信号，所述光接收组件对每一路光信号分别进行波分解复用。
第四实施例
该第四实施例提供了一种光模块，其包括壳体、电路板和光接收组件，所述电路板和所述光接收组件封装于所述壳体内。其中，所述光接收组件采用前文中第一实施例至第三实施例的任一个的光接收组件，所述光接收组件的所述光子集成芯片与所述电路板电连接。
所述光模块接收的光信号经所述光接收组件的所述自由空间的波分解复用器进行解复用之后，耦合到所述光子集成芯片内，经所述光子集成芯片的波分解复用构件进一步解复用之后，再由所述光子集成芯片的光探测构件转换为电信号，之后电信号传输到所述电路板上，经过所述电路板处理之后由所述光模块的电接口输出。
应当理解，虽然本说明书按照实施例加以描述，但并非每个实施例仅包含一个独立的技术方案，说明书的这种叙述方式仅仅是为清楚起见，本领域技术人员应当将说明书作为一个整体，各实施例中的技术方案也可以经适当组合，形成本领域技术人员可以理解的其他实施方式。
上文所列出的一系列的详细说明仅仅是针对本发明的可行性实施方式的具体说明，它们并非用以限制本发明的保护范围，凡未脱离本发明技艺精神所作的等效实施方式或变更均应包含在本发明的保护范围之内。

Claims (12)

  1. 一种光接收组件，其特征在于，包括：
    自由空间的波分解复用器，其具有复用信号输入端口和至少两个复用信号输出端口，当所述复用信号输入端口接收具有多个相邻波段的光信号时，至少一个所述复用信号输出端口输出光信号的波段不相邻；以及，
    光子集成芯片，其设有波分解复用构件，从所述复用信号输出端口输出的光信号由所述波分解复用构件分成所需波段的光信号。
  2. 根据权利要求1所述的光接收组件，其特征在于，每个所述复用信号输出端口输出光信号的波段不相邻。
  3. 根据权利要求2所述的光接收组件，其特征在于，不同的所述复用信号输出端口所输出的光信号所含波段数目相同。
  4. 根据权利要求3所述的光接收组件，其特征在于，所述自由空间的波分解复用器具有两个复用信号输出端口，所述复用信号输入端口所接收的具有波段λ1至λ2n的光信号，n为大于1的自然数，其中的奇数波段的光信号经由其一所述复用信号输出端口输出，偶数波段的光信号经由另一所述复用信号输出端口输出。
  5. 根据权利要求1所述的光接收组件，其特征在于，还包括耦合器，从每个所述复用信号输出端口输出的光信号经由所述耦合器耦合至所述光子集成芯片；
    所述光子集成芯片还设有耦合构件，所述耦合构件接收来自所述耦合器的光信号并将光信号传输至所述波分解复用构件。
  6. 根据权利要求5所述的光接收组件，其特征在于，所述耦合构件设置为端面耦合器，所述耦合器设置为一个或多个聚焦透镜。
  7. 根据权利要求1所述的光接收组件，其特征在于，所述波分解复用构件采用级联MZI型干涉仪、AWG结构、阶梯型光栅结构、反向布拉格光栅定向耦合器型解复用器的任一种。
  8. 根据权利要求1所述的光接收组件，其特征在于，所述光子集成芯片还设有光探测构件，每个经由所述波分解复用构件出射的光信号均被所述光探测构件接收并转换成电信号输出。
  9. 根据权利要求1所述的光接收组件，其特征在于，所述自由空间的波分解复用器包括自由空间设置的至少两个薄膜滤波片，每个所述薄膜滤波片构成一个所述复用信号输出端口，各个所述薄膜滤波片分别对不同波段的光信号进行滤波。
  10. 根据权利要求9所述的光接收组件，其特征在于，所述自由空间的波分解复用器包括透光固定块，所述透光固定块具有设置有所述复用信号输入端口的第一表面和设置有所述薄膜滤波片的第二表面，所述第一表面和所述第二表面平行相对；
    所述第一表面的部分区域设有高反射膜，一个所述薄膜滤波片所过滤阻隔的光信号反射至所述高反射膜，并被所述高反射膜反射至另一所述薄膜滤波片。
  11. 根据权利要求1所述的光接收组件，其特征在于，所述复用信号输入端口可以同时接收两路或以上的光信号，每路光信号分波至不同的所述复用信号输出端口输出；且，从所述复用信号输出端口输出的各路光信号分别由所述波分解复用构件分成所需波段的光信号。
  12. 一种光模块，包括壳体和封装于所述壳体内的电路板，其特征在于，所述光模块还包括权利要求1所述的光接收组件，所述光接收组件的所述光子集成芯片与所述电路板电连接。
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