A multi-channel wavelength division multiplexing bidirectional transceiver module

Abstract

The utility model relates to a kind of multi-channel wavelength division multiplexing bidirectional transceiver module, including optical circulator, wavelength division multiplexing module, wavelength division demultiplexing module and n optical transmission module;The first end of optical circulator is connected with the output end of wavelength division multiplexing module, the third end is connected with the input end of wavelength division demultiplexing module, and the second end is as external downlink signal input end and local uplink signal output end;Wavelength division multiplexing module is connected with wavelength division demultiplexing module by n optical transmission module;Single optical transmission module includes transmissive reflection double optical fiber optical assembly and optical fiber collimator, transmissive reflection double optical fiber optical assembly includes double optical fiber collimator and λ i filter, and λ i filter transmits signal light with wavelength λ i, and reflect signal light with wavelength except λ i;Wavelength division multiplexing module is used to combine n wavelengths signal in a optical fiber transmission;Wavelength division demultiplexing module is used to separate n wavelengths signal transmitted in a optical fiber. The module structure is simple, and loss is small, and realization cost is low.

Description

Technical Field

[0001] This utility model relates to the field of optical communication technology, specifically to a multi-channel wavelength division multiplexing bidirectional transceiver module. Background Technology

[0002] With the explosive growth of global data volume, data centers are placing higher demands on the transmission rate, capacity, and integration of optical communication modules. Traditional single-channel optical transceiver modules are no longer sufficient to meet these needs. While multi-channel modules can improve transmission efficiency, they suffer from problems such as complex structure, high insertion loss, and high implementation costs. For example, in conventional designs, multi-channel modules often employ a WDM device cascading scheme. However, WDM device cascading requires a large number of fiber collimators, leading to increased module size and cost. Utility Model Content

[0003] The purpose of this invention is to provide a multi-channel wavelength division multiplexing bidirectional transceiver module with simple structure, low cost, and low loss, thereby solving the problems of high module complexity, high loss, and high cost in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a multi-channel wavelength division multiplexing bidirectional transceiver module, including an optical circulator, a wavelength division multiplexing module, a wavelength division demultiplexing module, and an optical transmission system, wherein the optical transmission system is composed of n optical transmission modules, where n is an integer greater than 1; The first end of the optical circulator is connected to the output end of the wavelength division multiplexing module, the third end is connected to the input end of the wavelength division multiplexing module, and the second end serves as the external downlink signal input end and the local uplink signal output end. The wavelength division multiplexing module and the wavelength demultiplexing module are connected through n optical transmission modules; Each optical transmission module includes a transmissive and reflective dual-fiber optical assembly and a fiber collimator. The transmissive and reflective dual-fiber optical assembly includes a dual-fiber collimator and a λi filter. The λi filter is configured to transmit signal light with a wavelength of λi and reflect signal light with wavelengths other than λi, where i can be 1, 2, ..., n-1 or n. The wavelength division multiplexing module is used to combine signals of n wavelengths (λ1, λ2, ..., λn) into a single optical fiber for transmission; the wavelength demultiplexing module is used to separate the n wavelength signals transmitted in a single optical fiber.

[0005] Furthermore, the multi-channel wavelength division multiplexing bidirectional transceiver module is a Z-block-based multi-channel wavelength division multiplexing bidirectional transceiver module. Both the wavelength division multiplexing module and the wavelength demultiplexing module include a long-wavelength transparent and reflective dual-fiber optical component, a fiber collimator, and at least one Z-block optical component. The Z-block optical component includes an orthographic prism and at least two λi filters. The λi filters are sequentially arranged on the front and rear surfaces of the orthographic prism along the optical transmission path. In the wavelength division multiplexing module and the wavelength demultiplexing module, the arrangement order of the λi filters is reversed.

[0006] Furthermore, the wave demultiplexing module includes a long-wavelength transparent and reflective dual-fiber optical component, a fiber collimator, a first 8-channel Z-block optical component, and a second 8-channel Z-block optical component; the wave demultiplexing module achieves 16-channel signal transmission through the cascading of two 8-channel Z-block optical components. The first 8-channel Z-block optical assembly includes a first rhombic prism and λ1, λ2, λ3, λ4, λ5, λ6, λ7, and λ8 filters; the second 8-channel Z-block optical assembly includes a second rhombic prism and λ9, λ10, λ11, λ12, λ13, λ14, λ15, and λ16 filters. The long-wavelength transparent and reflective dual-fiber optical component is disposed on the upper front side of the first surface of the first rhomboid prism. The λ1 filter, λ3 filter, λ5 filter, and λ7 filter are disposed at intervals from top to bottom on the second surface of the first rhomboid prism. The λ2 filter, λ4 filter, λ6 filter, and λ8 filter are located on the lower side of the long-wavelength transparent and reflective dual-fiber optical component and are disposed at intervals from top to bottom on the first surface of the first rhomboid prism. The fiber collimator is disposed on the upper front side of the first surface of the second rhombic prism. The λ9 filter, λ11 filter, λ13 filter, and λ15 filter are disposed at intervals from top to bottom on the second surface of the second rhombic prism. The λ10 filter, λ12 filter, λ14 filter, and λ16 filter are located on the lower side of the fiber collimator and are disposed at intervals from top to bottom on the first surface of the second rhombic prism. The long-wavelength transparent and reflective dual-fiber optical component is configured to transmit signal light from λ1 to λ8 and reflect signal light from λ9 to λ16.

[0007] Furthermore, the wavelength division multiplexing module includes a long-wavelength transparent and reflective dual-fiber optical component, a fiber collimator, a third 8-channel Z-block optical component, and a fourth 8-channel Z-block optical component; the wavelength division multiplexing module achieves 16-channel signal transmission through the cascading of two 8-channel Z-block optical components. The third 8-channel Z-block optical component includes a third rhombic prism and λ8, λ7, λ6, λ5, λ4, λ3, λ2, and λ1 filters; the fourth 8-channel Z-block optical component includes a fourth rhombic prism and λ16, λ15, λ14, λ113, λ12, λ11, λ10, and λ9 filters. The long-wavelength transparent and reflective dual-fiber optical component is disposed on the upper front side of the first surface of the third rhomboid prism. The λ8 filter, λ6 filter, λ4 filter, and λ2 filter are disposed at intervals from top to bottom on the second surface of the third rhomboid prism. The λ7 filter, λ5 filter, λ3 filter, and λ1 filter are located on the lower side of the long-wavelength transparent and reflective dual-fiber optical component and are disposed at intervals from top to bottom on the first surface of the third rhomboid prism. The fiber collimator is disposed on the upper front side of the first surface of the fourth rhombic prism. The λ16 filter, λ14 filter, λ12 filter, and λ10 filter are disposed at intervals from top to bottom on the second surface of the fourth rhombic prism. The λ15 filter, λ13 filter, λ11 filter, and λ9 filter are located on the lower side of the fiber collimator and are disposed at intervals from top to bottom on the first surface of the fourth rhombic prism. The long-wavelength transparent and reflective dual-fiber optical component is configured to transmit signal light from λ1 to λ8 and reflect signal light from λ9 to λ16.

[0008] Furthermore, the multi-channel wavelength division multiplexing bidirectional transceiver module is a multi-channel wavelength division multiplexing bidirectional transceiver module based on a free-space optical module. Both the wavelength division multiplexing module and the wavelength demultiplexing module include a long-wavelength transparent and reflective dual-fiber optical component, an optical fiber collimator, and at least one free-space optical module. The free-space optical module includes a substrate and at least two λi filters. The λi filters are sequentially arranged on the left and right sides of the substrate along the optical transmission path. In the wavelength division multiplexing module and the wavelength demultiplexing module, the arrangement order of the λi filters is reversed.

[0009] Furthermore, the wavelength demultiplexing module includes a long-wavelength transparent and reflective dual-fiber optical component, a fiber collimator, a first 8-channel free-space optical module, and a second 8-channel free-space optical module; the wavelength demultiplexing module achieves 16-channel signal transmission through the cascading of two 8-channel free-space optical modules. The first 8-channel free space optical module includes a first substrate and λ1, λ2, λ3, λ4, λ5, λ6, λ7, and λ8 filters; the second 8-channel free space optical module includes a second substrate and λ9, λ10, λ11, λ12, λ13, λ14, λ15, and λ16 filters. The long-wavelength transparent and reflective dual-fiber optical component is disposed on the upper left side of the first substrate. The λ1 filter, λ3 filter, λ5 filter, and λ7 filter are disposed on the right side of the first substrate from top to bottom. The λ2 filter, λ4 filter, λ6 filter, and λ8 filter are located on the lower side of the long-wavelength transparent and reflective dual-fiber optical component and are disposed on the left side of the first substrate from top to bottom. The fiber collimator is disposed on the upper left side of the second substrate. The λ9 filter, λ11 filter, λ13 filter, and λ15 filter are disposed on the right side of the second substrate from top to bottom. The λ10 filter, λ12 filter, λ14 filter, and λ16 filter are located below the fiber collimator and are disposed on the left side of the second substrate from top to bottom. The long-wavelength transparent and reflective dual-fiber optical component is configured to transmit signal light from λ1 to λ8 and reflect signal light from λ9 to λ16.

[0010] Furthermore, the wavelength division multiplexing module includes a long-wavelength transparent and reflective dual-fiber optical component, a fiber collimator, a third 8-channel free-space optical module, and a fourth 8-channel free-space optical module; the wavelength division multiplexing module achieves 16-channel signal transmission through the cascading of two 8-channel free-space optical modules. The third 8-channel free space optical module includes a third substrate and λ8, λ7, λ6, λ5, λ4, λ3, λ2, and λ1 filters; the fourth 8-channel free space optical module includes a fourth substrate and λ16, λ15, λ14, λ113, λ12, λ11, λ10, and λ9 filters. The long-wavelength transparent and reflective dual-fiber optical component is disposed on the upper left side of the third substrate. The λ8 filter, λ6 filter, λ4 filter, and λ2 filter are disposed on the right side of the third substrate from top to bottom. The λ7 filter, λ5 filter, λ3 filter, and λ1 filter are located on the lower side of the long-wavelength transparent and reflective dual-fiber optical component and are disposed on the left side of the third substrate from top to bottom. The fiber collimator is disposed on the upper left side of the fourth substrate. The λ16 filter, λ14 filter, λ12 filter, and λ10 filter are disposed on the right side of the fourth substrate from top to bottom. The λ15 filter, λ13 filter, λ11 filter, and λ9 filter are located below the fiber collimator and are disposed on the left side of the fourth substrate from top to bottom. The long-wavelength transparent and reflective dual-fiber optical component is configured to transmit signal light from λ1 to λ8 and reflect signal light from λ9 to λ16.

[0011] Furthermore, the long-wavelength transparent-reflective dual-fiber optical component consists of a long-wavelength pass filter and a dual-fiber collimator.

[0012] Compared with existing technologies, this utility model has the following advantages: This utility model provides a multi-channel wavelength division multiplexing bidirectional transceiver module. The module has a reasonable structural design, employing a combination of a transmissive and reflective dual-fiber assembly and a collimator. When cascaded with traditional WDM devices or connected to a CWDM module using WDM devices, the WDM transmissive and reflective structure is simpler, improving coupling efficiency and reducing insertion loss; compared with conventional designs on the market ( Figure 19 This saves 2n fiber collimators, enabling a low-cost, high-efficiency bidirectional transceiver module for multi-channel multiplexing and demultiplexing. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the Z-block-based multi-channel wavelength division multiplexing bidirectional transceiver module provided in Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the wave decomposition and multiplexing module in Embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the wavelength division multiplexing module in Embodiment 1 of this utility model; Figure 4 This is a schematic diagram of the input light of the long-wavelength transparent and reflective dual-fiber optical component in Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of the output light of the long-wavelength transparent and reflective dual-fiber optical component in Embodiment 1 of this utility model; Figure 6 This is a schematic diagram of the λ1 transmittance and reflection dual-fiber optical component and optical path transmission in Embodiment 1 of this utility model; Figure 7 This is a schematic diagram of the λ13 transmissive and reflective dual-fiber optical component and optical path transmission in Embodiment 1 of this utility model; Figure 8 This is a schematic diagram of the λ9 transmittance and reflection dual-fiber optical component and optical path transmission in Embodiment 1 of this utility model; Figure 9This is a schematic diagram of the λ5 transmittance and reflection dual-fiber optical component and optical path transmission in Embodiment 1 of this utility model; Figure 10 This is a schematic diagram of the optical transmission system in Embodiment 1 of this utility model; Figure 11 This is a schematic diagram of the structure of the multi-channel wavelength division multiplexing bidirectional transceiver module based on a free space optical module provided in Embodiment 2 of this utility model; Figure 12 This is a schematic diagram of the wave decomposition and multiplexing module in Embodiment 2 of this utility model; Figure 13 This is a schematic diagram of the wavelength division multiplexing module in Embodiment 2 of this utility model; Figure 14 This is a schematic diagram of the input light of the long-wavelength transparent and reflective dual-fiber optical component in Embodiment 2 of this utility model; Figure 15 This is a schematic diagram of the output light of the long-wavelength transparent and reflective dual-fiber optical component in Embodiment 2 of this utility model; Figure 16 This is a schematic diagram of the λ1 transmittance and reflection dual-fiber optical component and optical path transmission in Embodiment 2 of this utility model; Figure 17 This is a schematic diagram of the λ13 transmissive and reflective dual-fiber optical component and optical path transmission in Embodiment 2 of this utility model; Figure 18 This is a schematic diagram of the optical transmission system in Embodiment 2 of this utility model; Figure 19 This is a structural diagram of a conventionally designed multi-channel module.

[0014] In the picture: 1. Optical circulator; 2. Demultiplexing module; 3. Multiplexing module; 4. Optical transmission system; 201. 8-channel Z-block optical assembly; 202. 8-channel Z-block optical assembly; 203. Long-wavelength transparent and reflective dual-fiber optical assembly; 204. Fiber collimator; 2011. First oblique prism; 2012. λ1 filter; 2013. λ2 filter; 2014. λ3 filter; 2015. λ4 filter; 2016. λ5 filter; 2017. λ6 filter; 2018. 2021, λ7 filter; 2022, λ9 filter; 2023, λ10 filter; 2024, λ11 filter; 2025, λ12 filter; 2026, λ13 filter; 2027, λ14 filter; 2028, λ15 filter; 2029, λ16 filter; 2031, long-pass filter; 2032, dual-fiber collimator; 301, 8-channel Z-block optical assembly; 302, 8-channel Z-block optical assembly; 303, Long-wavelength transparent and reflective dual-fiber optical assembly; 304, Fiber collimator; 3011, Third oblique prism; 3012, λ1 filter; 3013, λ2 filter; 3014, λ3 filter; 3015, λ4 filter; 3016, λ5 filter; 3017, λ6 filter; 3018 λ7 filter; λ19, λ8 filters; 3021, fourth oblique prism; 3022, λ9 filter; 3023, λ10 filter; 3024, λ11 filter; 3025, λ12 filter; 3026, λ13 filter; 3027, λ14 filter; 3028, λ15 filter; 3029, λ16 filter; 3031, long-pass filter; 3032, dual-fiber collimator; 401, λ1 Transmission-reflection dual-fiber optical assembly; 402, λ2 Transmission-reflection dual-fiber optical assembly; 403, λ3 Transmission-reflection dual-fiber optical assembly; 404, λ4 Transmission-reflection dual-fiber optical assembly; 405, λ9 Fiber collimator; 406, λ10 Fiber collimator; 407, λ11 Fiber collimator; 408, λ12 Fiber collimator; 409, λ13 Transmission-reflection dual-fiber optical assembly; 410, λ14 Transmission-reflection dual-fiber optical assembly; 411, λ15 Transmission-reflection dual-fiber optical assembly; 412, λ16 Transmission-reflection dual-fiber optical assembly; 413, λ5 Fiber collimator; 414, λ6 Fiber collimator; 415, λ7 Fiber collimator; 416, λ8 Fiber collimator; 417, λ9 Transmission-reflection dual-fiber optical assembly; 418, λ10 Transmission-reflection dual-fiber optical assembly; 419, λ11 Transmission-reflection dual-fiber optical assembly; 420, λ12 Transmission-reflection dual-fiber optical assembly; 421, λ1 Fiber collimator; 422, λ2 Fiber collimator; 423, λ3 Fiber collimator; 424, λ4 Fiber collimator; 425, λ5 Transmission-reflection dual-fiber optical assembly; 426, λ6 Transmission-reflection dual-fiber optical assembly; 427, λ7 Transmission-reflection dual-fiber optical assembly; 428, λ8 Transmission-reflection dual-fiber optical assembly; 429, λ13 Fiber collimator; 430, λ14 Fiber collimator; 431, λ15 Fiber collimator; 432, λ16 Fiber collimator; 5. Optical circulator; 6. Demultiplexing module; 7. Multiplexing module; 8. Optical transmission system; 601, 8-channel free-space optical module; 602, 8-channel free-space optical module; 603, long-wavelength transparent and reflective dual-fiber optical assembly; 604, fiber collimator; 6011 substrate; 6012, λ1 filter; 6013, λ2 filter; 6014, λ3 filter; 6015, λ4 filter; 6016, λ5 filter; 6017, λ6 filter; 6018, λ7 filter Filters; 6019, λ8 filters; 6021 substrate; 6022, λ9 filters; 6023, λ10 filters; 6024, λ11 filters; 6025, λ12 filters; 6026, λ13 filters; 6027, λ14 filters; 6028, λ15 filters; 6029, λ16 filters; 6031, long-pass filter one; 6032, dual-fiber collimator; 701, 8-channel free-space optical module; 702, 8-channel free-space optical module; 703, long-wavelength transparent and reflective dual-fiber optical assembly; 704, fiber collimator; 7011, substrate; 7012, λ1 filter; 7013, λ2 filter; 7014, λ3 filter; 7015, λ4 filter; 7016, λ5 filter; 7017, λ6 filter; 7018, λ7 filter Optical filters; 7019, λ8 filters; 7021, substrate; 7022, λ9 filters; 7023, λ10 filters; 7024, λ11 filters; 7025, λ12 filters; 7026, λ13 filters; 7027, λ14 filters; 7028, λ15 filters; 7029, λ16 filters; 7031, long-pass filters; 7032, dual-fiber collimator; 801, λ1 Transmission-reflection dual-fiber optical assembly; 802, λ2 Transmission-reflection dual-fiber optical assembly; 803, λ3 Transmission-reflection dual-fiber optical assembly; 804, λ4 Transmission-reflection dual-fiber optical assembly; 805, λ9 Fiber collimator; 806, λ10 Fiber collimator; 807, λ11 Fiber collimator; 808, λ12 Fiber collimator; 809, λ13 Transmission-reflection dual-fiber optical assembly; 810, λ14 Transmission-reflection dual-fiber optical assembly; 811, λ15 Transmission-reflection dual-fiber optical assembly; 812, λ16 Transmission-reflection dual-fiber optical assembly; 813, λ5 Fiber collimator; 814, λ6 Fiber collimator; 815, λ7 Fiber collimator; 816, λ8 Fiber collimator; 817, λ9 Transmission-reflection dual-fiber optical assembly; 818, λ10 Transmission-reflection dual-fiber optical assembly; 819, λ11 Transmission-reflection dual-fiber optical assembly; 820, λ12 Transmission-reflection dual-fiber optical assembly; 821, λ1 Fiber collimator; 822, λ2 Fiber collimator; 823, λ3 Fiber collimator; 824, λ4 Fiber collimator; 825, λ5 Transmission-reflection dual-fiber optical assembly; 826, λ6 Transmission-reflection dual-fiber optical assembly; 827, λ7 Transmission-reflection dual-fiber optical assembly; 828, λ8 Transmission-reflection dual-fiber optical assembly; 829, λ13 Fiber collimator; 830, λ14 Fiber collimator; 831, λ15 Fiber collimator; 832, λ16 Fiber collimator. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0017] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0018] This invention provides a multi-channel wavelength division multiplexing bidirectional transceiver module, including an optical circulator, a wavelength division multiplexing module, a wavelength division demultiplexing module, and an optical transmission system. The optical transmission system consists of n optical transmission modules, where n is an integer greater than 1.

[0019] The first end of the optical circulator is connected to the output end of the wavelength division multiplexing module, the third end is connected to the input end of the wavelength division multiplexing module, and the second end serves as the external downlink signal input end and the local uplink signal output end.

[0020] The wavelength division multiplexing module and the wavelength demultiplexing module are connected through n optical transmission modules.

[0021] Each optical transmission module includes a transmissive-reflective dual-fiber optical component and a fiber collimator. The transmissive-reflective dual-fiber optical component includes a dual-fiber collimator and a λi filter. The λi filter is configured to transmit signal light with a wavelength of λi and reflect signal light with wavelengths other than λi, where i can be 1, 2, ..., n-1 or n.

[0022] The wavelength division multiplexing module is used to combine signals of n wavelengths (λ1, λ2, ..., λn) into a single optical fiber for transmission; the wavelength demultiplexing module is used to separate the n wavelength signals transmitted in a single optical fiber.

[0023] After receiving the downlink signal from the outside at the second end of the optical circulator, it is transmitted to the third port of the optical circulator. The third end of the optical circulator transmits the signal to the input end of the wavelength division multiplexing (WDM) module. The WDM module outputs signals of wavelengths λ1, λ2, ..., λn, which are received by the optical transmission module and transmitted to the WDM module. The λ1 wavelength signal light is received by the λ1 transmit-reflection dual-fiber optic assembly and transmitted through transmission to the local transceiver. Simultaneously, any other signal light λn transmitted from the local transceiver, except for λ1, is reflected by the λ1 transmit-reflection dual-fiber optic assembly and transmitted to the fiber collimator. The fiber collimator transmits the λn signal light to the WDM module. The n signal lights output by the WDM module are transmitted to the local transceiver through the optical transmission module. The n uplink signals from the local transceiver are transmitted to the WDM module through the optical transmission module. The WDM module receives the n signal lights, combines them into one, and transmits it from the output end of the WDM module to the first end of the optical circulator, and then to the second end of the optical circulator.

[0024] The multi-channel wavelength division multiplexing bidirectional transceiver module can be a Z-block based multi-channel wavelength division multiplexing bidirectional transceiver module or a free space optical module based multi-channel wavelength division multiplexing bidirectional transceiver module.

[0025] In the Z-block-based multi-channel wavelength division multiplexing bidirectional transceiver module, both the wavelength division multiplexing module and the wavelength demultiplexing module include a long-wavelength transparent and reflective dual-fiber optical component, a fiber collimator, and at least one Z-block optical component. The Z-block optical component includes an orthographic prism and at least two λi filters, which are sequentially arranged on the front and rear surfaces of the orthographic prism along the optical transmission path. In the wavelength division multiplexing module and the wavelength demultiplexing module, the arrangement order of the λi filters is reversed.

[0026] In the aforementioned multi-channel wavelength division multiplexing bidirectional transceiver module based on a free-space optical module, the multi-channel wavelength division multiplexing bidirectional transceiver module is a multi-channel wavelength division multiplexing bidirectional transceiver module based on a free-space optical module. Both the wavelength division multiplexing module and the wavelength demultiplexing module include a long-wavelength transparent and reflective dual-fiber optical component, an optical fiber collimator, and at least one free-space optical module. The free-space optical module includes a substrate and at least two λi filters. The λi filters are sequentially arranged on the left and right sides of the substrate along the optical transmission path. In the wavelength division multiplexing module and the wavelength demultiplexing module, the arrangement order of the λi filters is reversed.

[0027] Example 1 like Figure 1 As shown, Embodiment 1 of this utility model provides a multi-channel wavelength division multiplexing bidirectional transceiver module based on Z-block, including an optical circulator 1, a wavelength division multiplexing module 2, a wavelength division multiplexing module 3, and an optical transmission system 4.

[0028] The first end ① of the optical circulator 1 is connected to the output end of the wavelength division multiplexing module 3, the third end ③ is connected to the input end of the wavelength division multiplexing module 2, and the second end ② serves as an input / output end for receiving external downlink signals and uploading local uplink signals.

[0029] like Figure 10 As shown, the optical transmission system consists of 16 optical transmission modules. One optical transmission module comprises a transmissive-reflective dual-fiber optic assembly 401 and a fiber collimator 405. Similarly, another optical transmission module comprises a transmissive-reflective dual-fiber optic assembly 402 and a fiber collimator 406. A third optical transmission module comprises a fiber collimator 431 and a transmissive-reflective dual-fiber optic assembly 427. A fourth optical transmission module comprises a fiber collimator 432 and a transmissive-reflective dual-fiber optic assembly 428. Figure 6-9 As shown, the λi transmittance and reflectance dual-fiber optical assembly consists of a λi filter and a dual-fiber collimator.

[0030] like Figure 2As shown, in this embodiment, the wavelet demultiplexing module 2 includes: a first 8-channel Z-block optical component 201, a second 8-channel Z-block optical component 202, a long-wavelength transparent and reflective dual-fiber optical component 203, and a fiber collimator 204. The first 8-channel Z-block optical component 201 is composed of an orthorhombic prism 2011, a λ1 filter 2012, a λ2 filter 2013, a λ3 filter 2014, a λ4 filter 2015, a λ5 filter 2016, a λ6 filter 2017, a λ7 filter 2018, and a λ8 filter 2019. The orthorhombic prism 2011 is a parallelogram-shaped glass plate polished on both sides, and the upper part of the left side face of the orthorhombic prism 2011 near the incident end is coated with an antireflection film as an input signal port. Filters 2012 (λ1), 2014 (λ3), 2016 (λ5), and 2018 (λ7) are sequentially bonded to the right side of the rhomboid prism 2011. Filters 2013 (λ2), 2015 (λ4), 2017 (λ6), and 2019 (λ8) are sequentially bonded to the left side of the rhomboid prism 2011. The optical signal is incident from the incident end of the rhomboid prism 2011 onto the first filter on the right side. The first filter transmits λ1 wavelengths and reflects other wavelengths; the second filter transmits λ2 wavelengths and reflects other wavelengths, and so on. The second 8-channel Z-block optical assembly 202 consists of an orthorhombic prism 2021 and λ9 filters 2060, λ10 filters 2023, λ11 filters 2024, λ12 filters 2025, λ13 filters 2026, λ14 filters 2027, λ15 filters 2028, and λ16 filters 2029. The orthorhombic prism 2021 is a parallelogram-shaped glass plate polished on both the front and back. The upper part of the left side face of the orthorhombic prism 2021 near the incident end is coated with an anti-reflection film as the input signal port. λ9 filters 2060, λ11 filters 2024, λ13 filters 2026, and λ15 filters 2028 are sequentially bonded to the right side of the rhomboid prism 2021. λ10 filters 2023, λ12 filters 2025, λ14 filters 2027, and λ16 filters 2029 are sequentially bonded to the left side of the rhomboid prism 2021. The optical signal is incident from the incident end of the rhomboid prism 2021 onto the first filter on the right side. The first filter transmits λ9 and reflects other wavelengths; the second filter transmits λ10 and reflects other wavelengths, and so on, with the eighth filter transmitting λ16 and reflecting other wavelengths. For example... Figure 4 As shown, the long-wavelength transparent-reflective dual-fiber optical component 203 consists of a long-wavelength pass filter 2031 and a dual-fiber collimator 2032. The wavelength division multiplexing module 2 can be configured to use two cascaded 8-channel Z-block optical components to achieve a wavelength division multiplexing optical module with n≤16 channels, depending on actual needs. The third port ③ of the optical circulator is connected to the 2033 fiber of the long-wavelength transparent-reflective fiber optical component 203, as shown... Figure 2 As shown, the signal light is split into two groups at the long-wavelength transparent-reflective dual-fiber optical component 203. One group of signal light is transmitted through the long-wavelength transparent-reflective dual-fiber optical component 203 to the incident end of the 8-channel Z-block optical component 201. Under the action of the filter in the 8-channel Z-block optical component 201, it is demultiplexed into λ1, λ2, λ3, λ4, ..., λ8 signal light for transmission. The other group of signal light is reflected by the long-wavelength transparent-reflective dual-fiber optical component 203. The fiber optic 2034 is connected to the fiber collimator 204. The fiber collimator 204 is coupled to the input end of the 8-channel Z-block optical component 202 and demultiplexed into λ9, λ10, λ11, ..., λ16 signal light for transmission.

[0031] like Figure 3As shown, the wavelength division multiplexing module 3 includes: a third 8-channel Z-block optical component 301, a fourth 8-channel Z-block optical component 302, a long-wavelength transparent and reflective dual-fiber optical component 303, and a fiber collimator 304. The third 8-channel Z-block optical component 301 consists of an oblique prism 3011 and λ1 filters 3012, λ2 filters 3013, λ3 filters 3014, λ4 filters 3015, λ5 filters 3016, λ6 filters 3017, λ7 filters 3018, and λ8 filters 3019. The oblique prism 3011 is a parallelogram-shaped glass plate polished on both sides. The upper part of the left side face of the oblique prism 3011 near the incident end is coated with an anti-reflection film as a signal transmission port. λ8 filter 3019, λ6 filter 3017, λ4 filter 3015, and λ2 filter 3013 are sequentially bonded to the right side of the rhomboid prism 3011, while λ7 filter 3018, λ5 filter 3016, λ3 filter 3014, and λ1 filter 3012 are sequentially bonded to the left side of the rhomboid prism 3011. The optical signal is incident on the first filter through the rhombic prism 3011. The first filter transmits through λ8 and reflects other wavelengths; the second filter transmits through λ7 and reflects other wavelengths; the third filter transmits through λ6 and reflects other wavelengths; the fourth filter transmits through λ5 and reflects other wavelengths; the fifth filter transmits through λ4 and reflects other wavelengths; the sixth filter transmits through λ3 and reflects other wavelengths; the seventh filter transmits through λ2 and reflects other wavelengths; and the eighth filter transmits through λ1 and reflects other wavelengths. The fourth 8-channel Z-block optical component 302 consists of an oblique prism 3021 and λ9 filters 3060, λ10 filters 3023, λ11 filters 3024, λ12 filters 3025, λ13 filters 3026, λ14 filters 3027, λ15 filters 3028, and λ16 filters 3029. The oblique prism 3021 is a parallelogram-shaped glass plate with polished front and back surfaces. The upper left side of the oblique prism 3021, near the incident end, is coated with an anti-reflection film as a signal transmission port. λ16 filter 3029, λ14 filter 3027, λ12 filter 3025, and λ10 filter 3023 are sequentially bonded to the right side of the rhomboid prism 3021, while λ15 filter 3028, λ13 filter 3026, λ11 filter 3024, and λ9 filter 3060 are sequentially bonded to the left side of the rhomboid prism 3021.The optical signal is incident from the rhomboid prism 3021 onto the first channel filter on the right. The first filter transmits through λ16 and reflects other wavelengths; the second filter transmits through λ15 and reflects other wavelengths; the third filter transmits through λ14 and reflects other wavelengths; the fourth filter transmits through λ13 and reflects other wavelengths; the fifth filter transmits through λ12 and reflects other wavelengths; the sixth filter transmits through λ11 and reflects other wavelengths; the seventh filter transmits through λ10 and reflects other wavelengths; the eighth filter transmits through λ9 and reflects other wavelengths; and so on. Figure 5 The long-wavelength transparent and reflective dual-fiber optical component 303 shown consists of a long-wavelength pass filter 3031 and a dual-fiber collimator 3032. The wavelength division multiplexing module 3 can be configured to use two cascaded 8-channel Z-block optical components to achieve a wavelength division multiplexing optical module with n≤16 channels, depending on actual needs. The fiber collimator 304 is coupled to the output of the 8-channel Z-block optical component 302, receiving signal light of 8 wavelengths: λ9, λ10, λ11, ..., λ16. The fiber collimator 304 is connected to the 3033 fiber of the long-wavelength transparent-reflective dual-fiber optical component 303, transmitting the 8 wavelength signals to the long-wavelength transparent-reflective dual-fiber optical component 303. The long-wavelength transparent-reflective dual-fiber optical component 303 simultaneously receives the signal light of 8 wavelengths (λ9, λ10, λ11, ..., λ16) multiplexed by the fourth 8-channel Z-block optical component 302 and the signal light of 8 wavelengths (λ1, λ2, λ3, ..., λ8) multiplexed by the third 8-channel Z-block optical component 301. After being combined, the signals are transmitted through the fiber optic cable 3034 to the first port ① of the optical circulator, completing the local uplink input of 16 wavelength optical signals.

[0032] The first 8-channel Z-block optical component 201 is demultiplexed into 8 wavelength signal light signals λ1, λ2, λ3, λ4, λ5, λ6, λ7, and λ8 for transmission. The λ1 wavelength signal light is received by the λ1 transmissive-reflective dual-fiber optical component 401, the λ2 wavelength signal light is received by the λ2 transmissive-reflective dual-fiber optical component 402, the λ3 wavelength signal light is received by the λ3 transmissive-reflective dual-fiber optical component 403, the λ4 wavelength signal light is received by the λ4 transmissive-reflective dual-fiber optical component 404, the λ5 wavelength signal light is received by the fiber collimator 413, the λ6 wavelength signal light is received by the fiber collimator 414, the λ7 wavelength signal light is received by the fiber collimator 415, and the λ8 wavelength signal light is received by the fiber collimator 416.

[0033] like Figure 6As shown, the λ1 wavelength signal light is incident on the λ1 transmissive-reflective dual-fiber optical component 401. After being transmitted through its λ1 filter 4011, it passes through the dual-fiber collimator 4012 and is transmitted to the local transceiver. At the same time, the signal light λ9 uploaded from the local transceiver is incident on the λ1 transmissive-reflective dual-fiber optical component 401. It first passes through one fiber of its dual-fiber collimator 4012, then is reflected by the λ1 filter, and then passes through the other fiber of the dual-fiber collimator 4012 before being transmitted to the fiber collimator 405. The fiber collimator 405 couples the λ9 signal light to the λ9 wavelength filter of the fourth 8-channel Z-block optical component 302. After being multiplexed by the fourth 8-channel Z-block optical component 302, it is received by the fiber collimator 304 of the wavelength division multiplexing module 3.

[0034] Similarly, the λ2 wavelength signal light is transmitted to the local transceiver via the λ2 transmittance-reflection dual-fiber optic assembly 402. The signal light λ10 uploaded by the local transceiver passes through the λ2 transmittance-reflection dual-fiber optic assembly 402, the fiber collimator 406, and the fourth 8-channel Z-block optic assembly 302 before entering the fiber collimator 304. The λ3 wavelength signal light is transmitted to the local transceiver via the λ3 transmittance-reflection dual-fiber optic assembly 403. The signal light λ11 uploaded by the local transceiver passes through the λ3 transmittance-reflection dual-fiber optic assembly 403, the fiber collimator 407, and the fourth 8-channel Z-block optic assembly 302 before entering the fiber collimator 304. The λ4 wavelength signal light is transmitted to the local transceiver via the λ4 transmittance-reflection dual-fiber optic assembly 404. The signal light λ12 uploaded by the local transceiver passes through the λ4 transmittance-reflection dual-fiber optic assembly 404, the fiber collimator 408, and the fourth 8-channel Z-block optic assembly 302 before entering the fiber collimator 304.

[0035] like Figure 7 As shown, the λ5 wavelength signal light is received by the fiber collimator 413 and transmitted to the λ13 transmissive dual-fiber optical component 409. It first passes through one fiber of its dual-fiber collimator 4132, and then is reflected by the λ13 filter 4131. After passing through the other fiber of the dual-fiber collimator 4132, it is transmitted to the local transceiver. At the same time, the λ13 signal light uploaded by the local transceiver is incident on the λ13 transmissive dual-fiber optical component 409. It first passes through its dual-fiber collimator 4132, and then is transmitted by the λ13 filter and coupled to the λ13 wavelength filter of the fourth 8-channel Z-block optical component 302. After being multiplexed by the fourth 8-channel Z-block optical component 302, it is received by the fiber collimator 304 of the wavelength division multiplexing module 3.

[0036] Similarly, the λ6 wavelength signal light is transmitted to the local transceiver via fiber collimator 414 and λ14 transmittance-reflection dual fiber optic assembly 410. Simultaneously, the λ14 signal light uploaded from the local transceiver passes through λ14 transmittance-reflection dual fiber optic assembly 410, then through the fourth 8-channel Z-block optical assembly 302, and finally enters the fiber collimator 304. The λ7 wavelength signal light is transmitted to the local transceiver via fiber collimator 415 and λ15 transmittance-reflection dual fiber optic assembly 411. Simultaneously, the λ15 signal light uploaded from the local transceiver passes through λ15 transmittance-reflection dual fiber optic assembly 411, then through the fourth 8-channel Z-block optical assembly 302, and finally enters the fiber collimator 304. The λ8 wavelength signal light is transmitted to the local transceiver via the fiber collimator 416 and the λ16 transmission-reflection dual fiber optic assembly 412. At the same time, the λ16 signal light uploaded by the local transceiver passes through the λ16 transmission-reflection dual fiber optic assembly 412 and the fourth 8-channel Z-block optical assembly 302 before entering the fiber collimator 304.

[0037] The second 8-channel Z-block optical component 202 is demultiplexed into eight other wavelengths: λ9, λ10, λ11, λ12, λ13, λ14, λ15, and λ16. The λ9 wavelength signal light is received by the λ9 transmittance-reflection dual-fiber optical component 417, the λ10 wavelength signal light is received by the λ10 transmittance-reflection dual-fiber optical component 418, the λ11 wavelength signal light is received by the λ11 transmittance-reflection dual-fiber optical component 419, the λ12 wavelength signal light is received by the λ12 transmittance-reflection dual-fiber optical component 420, the λ13 wavelength signal light is received by the fiber collimator 429, the λ14 wavelength signal light is received by the fiber collimator 430, the λ15 wavelength signal light is received by the fiber collimator 431, and the λ16 wavelength signal light is received by the fiber collimator 432.

[0038] like Figure 8As shown, the λ9 wavelength signal light is incident on the λ9 transmissive-reflective dual-fiber optical component 417. After being transmitted through its λ9 filter 4171, it passes through the dual-fiber collimator 4172 and is transmitted to the local transceiver. At the same time, the signal light λ1 uploaded by the local transceiver is incident on the λ9 transmissive-reflective dual-fiber optical component 417. It first passes through one fiber of its dual-fiber collimator 4172, and then is reflected by the λ9 filter. After passing through the other fiber of the dual-fiber collimator 4172, it is transmitted to the fiber collimator 421. The fiber collimator 421 couples the λ1 signal light to the λ1 wavelength filter of the third 8-channel Z-block optical component 301. After being multiplexed by the third 8-channel Z-block optical component 301, it is received by the long-wavelength transmissive-reflective dual-fiber optical component 303 of the wavelength division multiplexing module 3. Similarly, the λ10 wavelength signal light is transmitted to the local transceiver via the λ10 transmittance-reflection dual-fiber optical assembly 418. The signal light λ2 uploaded by the local transceiver passes through the λ10 transmittance-reflection dual-fiber optical assembly 418, the fiber collimator 460, and the third 8-channel Z-block optical assembly 301 before entering the long-wavelength transmittance-reflection dual-fiber optical assembly 303. The λ11 wavelength signal light is transmitted to the local transceiver via the λ11 transmittance-reflection dual-fiber optical assembly 419. The signal light λ3 uploaded by the local transceiver passes through the λ11 transmittance-reflection dual-fiber optical assembly 419, the fiber collimator 423, and the third 8-channel Z-block optical assembly 301 before entering the long-wavelength transmittance-reflection dual-fiber optical assembly 303. The λ12 wavelength signal light is transmitted to the local transceiver via the λ12 transmissive dual-fiber optical component 420. The signal light λ3 uploaded by the local transceiver passes through the λ12 transmissive dual-fiber optical component 420, the fiber collimator 424, and the third 8-channel Z-block optical component 301 before entering the long-wavelength transmissive dual-fiber optical component 303.

[0039] like Figure 9 As shown, the λ13 wavelength signal light is received by the fiber collimator 429 and transmitted to the λ5 transmissive-reflective dual-fiber optical component 425. It first passes through one fiber of its dual-fiber collimator 4292, and then is reflected by the λ5 filter 4291. After passing through the other fiber of the dual-fiber collimator 4292, it is transmitted to the local transceiver. At the same time, the λ5 signal light uploaded by the local transceiver is incident on the λ5 transmissive-reflective dual-fiber optical component 425. It first passes through its dual-fiber collimator 4292, and then is transmitted by the λ5 filter and coupled to the λ5 wavelength filter of the third 8-channel Z-block optical component 301. After being multiplexed by the third 8-channel Z-block optical component 301, it is received by the long-wavelength transmissive-reflective dual-fiber optical component 303 of the wavelength division multiplexing module 3.

[0040] Similarly, the λ14 wavelength signal light is transmitted to the local transceiver via fiber collimator 429 and λ6 transmittance / reflection dual fiber optic assembly 426. Simultaneously, the λ6 signal light uploaded from the local transceiver passes through λ6 transmittance / reflection dual fiber optic assembly 426 and the third 8-channel Z-block optical assembly 301 before entering the long-wavelength transmittance / reflection dual fiber optic assembly 303. The λ15 wavelength signal light is transmitted to the local transceiver via fiber collimator 431 and λ7 transmittance / reflection dual fiber optic assembly 427. Simultaneously, the λ7 signal light uploaded from the local transceiver passes through λ7 transmittance / reflection dual fiber optic assembly 427 and the third 8-channel Z-block optical assembly 301 before entering the long-wavelength transmittance / reflection dual fiber optic assembly 303. The λ16 wavelength signal light is transmitted to the local transceiver via the fiber collimator 432 and the λ8 transmittance-reflection dual fiber optic assembly 428. At the same time, the λ8 signal light uploaded by the local transceiver passes through the λ8 transmittance-reflection dual fiber optic assembly 428 and the third 8-channel Z-block optical assembly 301 before entering the long-wavelength transmittance-reflection dual fiber optic assembly 303.

[0041] The long-wavelength transparent-reflective dual-fiber optical component 303 combines the eight wavelengths λ1, λ2, λ3, ..., λ8 multiplexed from the output of the third 8-channel Z-block optical component 301 and the eight wavelengths λ9, λ10, ..., λ16 multiplexed from the fiber collimator 304 of the fourth 8-channel Z-block optical component 302 and transmits them to the first end ① of the optical circulator. This enables the reception of external downlink signals and the uploading of local uplink signals.

[0042] Example 2 like Figure 11 As shown, Embodiment 2 of this utility model provides a multi-channel wavelength division multiplexing bidirectional transceiver module based on a free-space optical module, including an optical circulator 5, a wavelength division multiplexing module 6, a wavelength division multiplexing module 7, and an optical transmission system 8.

[0043] The first end ④ of the optical circulator 5 is connected to the output end of the wavelength division multiplexing module 7, the third end ⑥ is connected to the input end 6 of the wavelength division multiplexing module, and the second end ⑤ of the optical circulator serves as an input / output end, used to connect external downlink signals and upload local uplink signals.

[0044] The difference from Embodiment 1 lies in the structure of Wavelength Decomposition Multiplexing Module 6 and Wavelength Decomposition Multiplexing Module 7.

[0045] like Figure 12As shown, in this embodiment, the wavelength demultiplexing module 6 includes: a first 8-channel free space optical module 601, a second 8-channel free space optical module 602, a long-wavelength transparent and reflective dual-fiber optical component 603, and an optical fiber collimator 604. The first 8-channel free space optical module 601 is composed of a substrate 6011, a λ1 filter 6012, a λ2 filter 6013, a λ3 filter 6014, a λ4 filter 6015, a λ5 filter 6016, a λ6 filter 6017, a λ7 filter 6018, and a λ8 filter 6019. The λ2 filter 6013, λ4 filter 6015, λ6 filter 6017, and λ8 filter 6019 are sequentially bonded to the left side of the upper surface of the substrate 6011, with the bonding position leaving a certain distance from the left edge of the substrate. λ1 filter 6012, λ3 filter 6014, λ5 filter 6016, and λ7 filter 6018 are sequentially bonded to the right side of the upper surface of substrate 6011, with a certain distance between the bonding positions and the right edge of the substrate. When an optical signal is incident on the first filter on the right side, the first filter transmits λ1 and reflects other wavelengths; the second filter transmits λ2 and reflects other wavelengths, and so on. The second 8-channel free space optical module 602 consists of substrate 6021 and λ9 filter 6060, λ10 filter 6023, λ11 filter 6024, λ12 filter 6025, λ13 filter 6026, λ14 filter 6027, λ15 filter 6028, and λ16 filter 6029. λ10 filters 6023, λ12 filters 6025, λ14 filters 6027, and λ16 filters 6029 are sequentially bonded to the left side of the upper surface of substrate 6021, with a certain distance between the bonding positions and the left edge of the substrate. λ9 filters 6060, λ11 filters 6024, λ13 filters 6026, and λ15 filters 6028 are sequentially bonded to the right side of the upper surface of substrate 6021, with a certain distance between the bonding positions and the right edge of the substrate. When a light signal is incident on the first filter on the right side, the first filter transmits λ9 and reflects other wavelengths; the second filter transmits λ10 and reflects other wavelengths, and so on, with the eighth filter transmitting λ16 and reflecting other wavelengths. For example... Figure 15 As shown, the long-wavelength transparent-reflective dual-fiber optical component 603 consists of a long-wavelength pass filter 6031 and dual-fiber collimators 6032. The wavelength division multiplexing module 5 can be configured to achieve wavelength division multiplexing with n≤16 channels by cascading two 8-channel free-space optical modules, according to actual needs. The optical circulator port ⑥ is connected to the 6033 fiber of the long-wavelength transparent-reflective fiber optical component 603, as shown... Figure 12As shown, the signal light is split into two groups at the long-wavelength transparent-reflective dual-fiber optical component 603. One group of signal light is transmitted through the long-wavelength transparent-reflective dual-fiber optical component 603 to the incident end of the 8-channel free space optical module 601. Under the action of the filter in the 8-channel free space optical module 601, it is demultiplexed into λ1, λ2, λ3, λ4, ..., λ8 signal light for transmission. The other group of signal light is reflected by the long-wavelength transparent-reflective dual-fiber optical component 603. The fiber optic cable 6034 is connected to the fiber collimator 604. The fiber collimator 604 is coupled to the input end of the 8-channel free space optical module 602 and demultiplexed into λ9, λ10, λ11, ..., λ16 signal light for transmission.

[0046] like Figure 13As shown, the wavelength division multiplexing module 7 includes: a third 8-channel free space optical module 701, a fourth 8-channel free space optical module 702, a transmissive and reflective dual-fiber optical assembly 703, and an optical fiber collimator 704. The third 8-channel free space optical module 701 is composed of a substrate 7011 and λ1 filters 7012, λ2 filters 7013, λ3 filters 7014, λ4 filters 7015, λ5 filters 7016, λ6 filters 7017, λ7 filters 7018, and λ8 filters 7019. λ7 filters 7018, λ5 filters 7016, λ3 filters 7014, and λ1 filters 7012 are sequentially bonded to the left side of the substrate 7011, with a certain distance between the bonding positions and the left edge of the substrate. λ8 filter 7019, λ6 filter 7017, λ4 filter 7015, and λ2 filter 7013 are sequentially bonded to the right side of substrate 7011, with a certain distance between the bonding positions and the right edge of the substrate. When an optical signal is incident on the first filter, the first filter transmits λ8 and reflects other wavelengths; the second filter transmits λ7 and reflects other wavelengths; the third filter transmits λ6 and reflects other wavelengths; the fourth filter transmits λ5 and reflects other wavelengths; the fifth filter transmits λ4 and reflects other wavelengths; the sixth filter transmits λ3 and reflects other wavelengths; the seventh filter transmits λ2 and reflects other wavelengths; and the eighth filter transmits λ1 and reflects other wavelengths. The fourth 8-channel free-space optical module 702 consists of a substrate 7021 and a series of filters: λ9 filter 7060, λ10 filter 7023, λ11 filter 7024, λ12 filter 7025, λ13 filter 7026, λ14 filter 7027, λ15 filter 7028, and λ16 filter 7029. The λ15 filter 7028, λ13 filter 7026, λ11 filter 7024, and λ9 filter 7060 are sequentially bonded to the left side of the substrate 7021, with a certain distance between the bonding positions and the left edge of the substrate. The λ16 filter 7029, λ14 filter 7027, λ12 filter 7025, and λ10 filter 7023 are sequentially bonded to the right side of the substrate 7021, with a certain distance between the bonding positions and the right edge of the substrate. The optical signal is incident on the first channel filter on the right. The first filter transmits through λ16 and reflects other wavelengths; the second filter transmits through λ15 and reflects other wavelengths; the third filter transmits through λ14 and reflects other wavelengths; the fourth filter transmits through λ13 and reflects other wavelengths; the fifth filter transmits through λ12 and reflects other wavelengths; the sixth filter transmits through λ11 and reflects other wavelengths; the seventh filter transmits through λ10 and reflects other wavelengths; and the eighth filter transmits through λ9 and reflects other wavelengths. The long-wavelength pass-through and reflective dual-fiber optical component 703 consists of a long-wavelength pass filter 7031 and dual-fiber collimators 7032.The wavelength division multiplexing (WDM) module can be configured to achieve a wavelength division multiplexing optical module with n≤16 channels by cascading two 8-channel free-space optical modules according to actual needs. The fiber collimator 704 is coupled to the output of the fourth 8-channel free-space optical module 702, receiving signal light of eight wavelengths: λ9, λ10, λ11, ..., λ16. The fiber collimator 704 is connected to the 7033 fiber of the long-wavelength transparent-reflective dual-fiber optical component 703, transmitting the eight wavelength signals to the long-wavelength transparent-reflective dual-fiber optical component 703. The long-wavelength transparent-reflective dual-fiber optical component 703 simultaneously receives the signal light of λ9, λ10, λ11, ..., λ16 multiplexed by the 8-channel free-space optical module 702 and the signal light of λ1, λ2, λ3, ..., λ8 multiplexed by the 8-channel free-space optical module 701. After multiplexing, the signals are transmitted through fiber 7034 to the fourth end of the optical circulator, completing the multiplexing transmission of the external 16-channel wavelength optical signals.

[0047] The first 8-channel free-space optical module 601 demultiplexes the signal light into 8 wavelengths λ1, λ2, λ3, λ4, λ5, λ6, λ7, and λ8 for transmission. The λ1 wavelength signal light is received by the λ1 transmissive-reflective dual-fiber optical component 801, the λ2 wavelength signal light is received by the λ2 transmissive-reflective dual-fiber optical component 802, the λ3 wavelength signal light is received by the λ3 transmissive-reflective dual-fiber optical component 803, the λ4 wavelength signal light is received by the λ4 transmissive-reflective dual-fiber optical component 804, the λ5 wavelength signal light is received by the fiber collimator 813, the λ6 wavelength signal light is received by the fiber collimator 814, the λ7 wavelength signal light is received by the fiber collimator 815, and the λ8 wavelength signal light is received by the fiber collimator 816.

[0048] Example 2 and other components of Example 1 (such as...) Figures 14-18 The results shown are the same, so I won't go into detail here.

[0049] The multi-channel wavelength division multiplexing bidirectional transceiver module provided by this utility model has a reasonable structural design and adopts a transmissive and reflective dual-fiber assembly, which is simpler than the transmission cascade scheme or the use of WDM transmissive and reflective structures, improves coupling efficiency, and reduces insertion loss; compared with such... Figure 19 Compared to conventional designs on the market, which use WDM devices for connection and contain one collimator, this design saves 32 fiber collimators, enabling low-cost, high-efficiency multi-channel multiplexing and demultiplexing modules.

[0050] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its scope of protection shall still fall within the protection scope of this utility model.

Claims

1. A multi-channel wavelength division multiplexing bidirectional transceiver module, characterized in that, It includes an optical circulator, a wavelength division multiplexing module, a wavelength division demultiplexing module, and an optical transmission system. The optical transmission system consists of n optical transmission modules, where n is an integer greater than 1. The first end of the optical circulator is connected to the output end of the wavelength division multiplexing module, the third end is connected to the input end of the wavelength division multiplexing module, and the second end serves as the external downlink signal input end and the local uplink signal output end. The wavelength division multiplexing module and the wavelength demultiplexing module are connected through n optical transmission modules; Each optical transmission module includes a transmissive and reflective dual-fiber optical assembly and a fiber collimator. The transmissive and reflective dual-fiber optical assembly includes a dual-fiber collimator and a λi filter. The λi filter is configured to transmit signal light with a wavelength of λi and reflect signal light with wavelengths other than λi, where i can be 1, 2, ..., n-1 or n. The wavelength division multiplexing module is used to combine signals of n wavelengths (λ1, λ2, ..., λn) into a single optical fiber for transmission; the wavelength demultiplexing module is used to separate the n wavelength signals transmitted in a single optical fiber.

2. The multi-channel wavelength division multiplexing bidirectional transceiver module according to claim 1, characterized in that, The multi-channel wavelength division multiplexing bidirectional transceiver module is a Z-block based multi-channel wavelength division multiplexing bidirectional transceiver module. Both the wavelength division multiplexing module and the wavelength demultiplexing module include a long-wavelength transparent and reflective dual-fiber optical component, a fiber collimator, and at least one Z-block optical component. The Z-block optical component includes an orthographic prism and at least two λi filters. The λi filters are sequentially arranged on the front and rear surfaces of the orthographic prism along the light transmission path. In the wavelength division multiplexing module and the wavelength demultiplexing module, the arrangement order of the λi filters is reversed.

3. The multi-channel wavelength division multiplexing bidirectional transceiver module according to claim 2, characterized in that, The wave demultiplexing module includes a long-wavelength transparent and reflective dual-fiber optical component, a fiber collimator, a first 8-channel Z-block optical component, and a second 8-channel Z-block optical component; the wave demultiplexing module achieves 16-channel signal transmission by cascading two 8-channel Z-block optical components. The first 8-channel Z-block optical assembly includes a first rhombic prism and λ1, λ2, λ3, λ4, λ5, λ6, λ7, and λ8 filters; the second 8-channel Z-block optical assembly includes a second rhombic prism and λ9, λ10, λ11, λ12, λ13, λ14, λ15, and λ16 filters. The long-wavelength transparent and reflective dual-fiber optical component is disposed on the upper front side of the first surface of the first rhomboid prism. The λ1 filter, λ3 filter, λ5 filter, and λ7 filter are disposed at intervals from top to bottom on the second surface of the first rhomboid prism. The λ2 filter, λ4 filter, λ6 filter, and λ8 filter are located on the lower side of the long-wavelength transparent and reflective dual-fiber optical component and are disposed at intervals from top to bottom on the first surface of the first rhomboid prism. The fiber collimator is disposed on the upper front side of the first surface of the second rhombic prism. The λ9 filter, λ11 filter, λ13 filter, and λ15 filter are disposed at intervals from top to bottom on the second surface of the second rhombic prism. The λ10 filter, λ12 filter, λ14 filter, and λ16 filter are located on the lower side of the fiber collimator and are disposed at intervals from top to bottom on the first surface of the second rhombic prism. The long-wavelength transparent and reflective dual-fiber optical component is configured to transmit signal light from λ1 to λ8 and reflect signal light from λ9 to λ16.

4. The multi-channel wavelength division multiplexing bidirectional transceiver module according to claim 2, characterized in that, The wavelength division multiplexing module includes a long-wavelength transparent and reflective dual-fiber optical component, a fiber collimator, a third 8-channel Z-block optical component, and a fourth 8-channel Z-block optical component; the wavelength division multiplexing module achieves 16-channel signal transmission by cascading two 8-channel Z-block optical components. The third 8-channel Z-block optical component includes a third rhombic prism and λ8, λ7, λ6, λ5, λ4, λ3, λ2, and λ1 filters; the fourth 8-channel Z-block optical component includes a fourth rhombic prism and λ16, λ15, λ14, λ113, λ12, λ11, λ10, and λ9 filters. The long-wavelength transparent and reflective dual-fiber optical component is disposed on the upper front side of the first surface of the third rhomboid prism. The λ8 filter, λ6 filter, λ4 filter, and λ2 filter are disposed at intervals from top to bottom on the second surface of the third rhomboid prism. The λ7 filter, λ5 filter, λ3 filter, and λ1 filter are located on the lower side of the long-wavelength transparent and reflective dual-fiber optical component and are disposed at intervals from top to bottom on the first surface of the third rhomboid prism. The fiber collimator is disposed on the upper front side of the first surface of the fourth rhombic prism. The λ16 filter, λ14 filter, λ12 filter, and λ10 filter are disposed at intervals from top to bottom on the second surface of the fourth rhombic prism. The λ15 filter, λ13 filter, λ11 filter, and λ9 filter are located on the lower side of the fiber collimator and are disposed at intervals from top to bottom on the first surface of the fourth rhombic prism. The long-wavelength transparent and reflective dual-fiber optical component is configured to transmit signal light from λ1 to λ8 and reflect signal light from λ9 to λ16.

5. The multi-channel wavelength division multiplexing bidirectional transceiver module according to claim 2, characterized in that, The long-wavelength transparent and reflective dual-fiber optical assembly consists of a long-wavelength pass filter and a dual-fiber collimator.

6. The multi-channel wavelength division multiplexing bidirectional transceiver module according to claim 1, characterized in that, The multi-channel wavelength division multiplexing bidirectional transceiver module is a multi-channel wavelength division multiplexing bidirectional transceiver module based on a free-space optical module. Both the wavelength division multiplexing module and the wavelength demultiplexing module include a long-wavelength transparent and reflective dual-fiber optical component, an optical fiber collimator, and at least one free-space optical module. The free-space optical module includes a substrate and at least two λi filters. The λi filters are sequentially arranged on the left and right sides of the substrate along the optical transmission path. In the wavelength division multiplexing module and the wavelength demultiplexing module, the arrangement order of the λi filters is reversed.

7. The multi-channel wavelength division multiplexing bidirectional transceiver module according to claim 6, characterized in that, The wavelength demultiplexing module includes a long-wavelength transparent and reflective dual-fiber optical component, a fiber collimator, a first 8-channel free-space optical module, and a second 8-channel free-space optical module; the wavelength demultiplexing module achieves 16-channel signal transmission through the cascading of two 8-channel free-space optical modules. The first 8-channel free space optical module includes a first substrate and λ1, λ2, λ3, λ4, λ5, λ6, λ7, and λ8 filters; the second 8-channel free space optical module includes a second substrate and λ9, λ10, λ11, λ12, λ13, λ14, λ15, and λ16 filters. The long-wavelength transparent and reflective dual-fiber optical component is disposed on the upper left side of the first substrate. The λ1 filter, λ3 filter, λ5 filter, and λ7 filter are disposed on the right side of the first substrate from top to bottom. The λ2 filter, λ4 filter, λ6 filter, and λ8 filter are located on the lower side of the long-wavelength transparent and reflective dual-fiber optical component and are disposed on the left side of the first substrate from top to bottom. The fiber collimator is disposed on the upper left side of the second substrate. The λ9 filter, λ11 filter, λ13 filter, and λ15 filter are disposed on the right side of the second substrate from top to bottom. The λ10 filter, λ12 filter, λ14 filter, and λ16 filter are located below the fiber collimator and are disposed on the left side of the second substrate from top to bottom. The long-wavelength transparent and reflective dual-fiber optical component is configured to transmit signal light from λ1 to λ8 and reflect signal light from λ9 to λ16.

8. The multi-channel wavelength division multiplexing bidirectional transceiver module according to claim 6, characterized in that, The wavelength division multiplexing module includes a long-wavelength transparent and reflective dual-fiber optical component, a fiber collimator, a third 8-channel free-space optical module, and a fourth 8-channel free-space optical module; the wavelength division multiplexing module achieves 16-channel signal transmission through the cascading of two 8-channel free-space optical modules. The third 8-channel free space optical module includes a third substrate and λ8, λ7, λ6, λ5, λ4, λ3, λ2, and λ1 filters; the fourth 8-channel free space optical module includes a fourth substrate and λ16, λ15, λ14, λ113, λ12, λ11, λ10, and λ9 filters. The long-wavelength transparent and reflective dual-fiber optical component is disposed on the upper left side of the third substrate. The λ8 filter, λ6 filter, λ4 filter, and λ2 filter are disposed on the right side of the third substrate from top to bottom. The λ7 filter, λ5 filter, λ3 filter, and λ1 filter are located on the lower side of the long-wavelength transparent and reflective dual-fiber optical component and are disposed on the left side of the third substrate from top to bottom. The fiber collimator is disposed on the upper left side of the fourth substrate. The λ16 filter, λ14 filter, λ12 filter, and λ10 filter are disposed on the right side of the fourth substrate from top to bottom. The λ15 filter, λ13 filter, λ11 filter, and λ9 filter are located below the fiber collimator and are disposed on the left side of the fourth substrate from top to bottom. The long-wavelength transparent and reflective dual-fiber optical component is configured to transmit signal light from λ1 to λ8 and reflect signal light from λ9 to λ16.

9. The multi-channel wavelength division multiplexing bidirectional transceiver module according to claim 6, characterized in that, The long-wavelength transparent and reflective dual-fiber optical assembly consists of a long-wavelength pass filter and a dual-fiber collimator.

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