Wavelength division multiplexer for 50G-PON, optical port integrated assembly and optical device

Abstract

The utility model belongs to the technical field of optical communication, and provides a wavelength division multiplexer for a 50G-PON, which comprises a first reflecting prism, a second reflecting prism and a rhombic prism. A first filter, a third filter and a fifth filter are arranged on the first surface of the rhombic prism, and a second filter and a fourth filter are arranged on the second surface of the rhombic prism; the second filter is located on a reflection light path of the first filter, the third filter is located on a reflection light path of the second filter, the fourth filter is located on a reflection light path of the third filter, and the fifth filter is located on a light path of the fourth filter; the first reflecting prism is positioned on a transmission light path of the fifth filter; the first reflecting surface of the second reflecting prism is located on the transmission light path of the second filter, and the second reflecting surface of the second reflecting prism is located on the transmission light path of the fourth filter. The wavelength division multiplexer can distribute a plurality of receiving end wavelength narrow bands to corresponding detectors, and meets the requirements of three-mode coexistence wavelength division multiplexing and narrow band wave distribution.

Description

Technical Field

[0001] This utility model belongs to the field of optical communication technology, specifically relating to a wavelength division multiplexer for 50G-PON, an integrated optical port component, and optical devices. Background Technology

[0002] 50G PON is a crucial technology for future fiber optic communication networks. With the improvement of standards and the maturity of the industry chain, 50GPON will become the mainstream technology for next-generation fiber optic access networks. It aims to provide transmission rates up to 50 Gbps to meet future demands for high-bandwidth, low-latency networks. It is an evolution of existing PON technology, supporting coexistence with existing PON networks and employing wavelength division multiplexing (WDM) technology for smooth network upgrades. To further promote the commercial deployment of 50G PON and ensure compatibility with existing PON network architectures, a miniaturized optical component capable of tri-mode coexistence needs to be developed to achieve the wavelength division multiplexing and narrowband wavelength division multiplexing requirements of 50G PON. Utility Model Content

[0003] The purpose of this invention is to achieve 50G PON tri-mode coexistence on optical components, ensuring miniaturization, isolation, and addressing the challenges of narrowband wavelength division.

[0004] Therefore, this utility model provides a wavelength division multiplexer for 50G-PON, including a first reflecting prism, a second reflecting prism, and an orthographic prism; a first filter, a third filter, and a fifth filter are disposed on the first surface of the orthographic prism; a second filter and a fourth filter are disposed on the second surface of the orthographic prism; the second filter is located on the reflected optical path of the first filter, the third filter is located on the reflected optical path of the second filter, the fourth filter is located on the reflected optical path of the third filter, and the fifth filter is located on the transmitted optical path of the fourth filter; the first reflecting prism is located on the transmitted optical path of the fifth filter; the first reflecting surface of the second reflecting prism is located on the transmitted optical path of the second filter, and the second reflecting surface of the second reflecting prism is located on the transmitted optical path of the fourth filter.

[0005] Specifically, the first reflecting prism has a first silicon lens in its reflected light path, and the second reflecting prism has a second silicon lens in its reflected light path.

[0006] Specifically, the wavelength division multiplexer also includes a support substrate; the first reflecting prism, the second reflecting prism, and the rhombic prism are all mounted on the support substrate.

[0007] This utility model also provides an integrated optical port assembly for 50G-PON, including a housing with a mirror cavity and the aforementioned wavelength division multiplexer; the wavelength division multiplexer is installed inside the mirror cavity.

[0008] Specifically, the aforementioned housing is provided with an optical port mating hole, a first detector mating hole, a second detector mating hole, a third detector mating hole, and multiple laser mating holes; the mirror cavity is provided with a multiplexing unit for combining the light entering through each laser mating hole into an outgoing multiplexed light; the first filter of the wavelength division multiplexer is located on the optical path of the outgoing multiplexed light; the optical port mating hole is located on the transmission optical path of the first filter; the first detector mating hole is located on the reflection optical path of the first reflecting prism; the second detector mating hole is located on the reflection optical path of the first reflecting surface of the second reflecting prism; and the third detector mating hole is located on the reflection optical path of the second reflecting surface of the second reflecting prism.

[0009] Specifically, a converging lens is provided between the wavelength division multiplexer and the optical port; the converging lens is located on the transmission light path of the first filter.

[0010] Specifically, the aforementioned wavelength division multiplexing unit includes multiple diaphragms, each of which is arranged sequentially along the mirror cavity. The two surfaces of the first diaphragm are respectively aligned with two of the laser mating holes, and the remaining diaphragms are respectively matched with the remaining laser mating holes. The surface of each diaphragm facing the wavelength division multiplexer reflects the incident light, while the other surface of the diaphragm transmits the incident light.

[0011] Specifically, an optical isolator is provided on the optical path between the aforementioned multiplexing unit and the wavelength division multiplexer.

[0012] Specifically, a collimating lens is provided in the optical path between the optical isolator and the wavelength division multiplexer.

[0013] This utility model also provides a 50G-PON optical device, including a laser, a detector, and the aforementioned integrated optical port assembly; the laser and the detector are respectively mounted on the housing of the integrated optical port assembly.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0015] This utility model provides a 50G-PON wavelength division multiplexer that integrates a Z-Block beam splitter, a first reflecting prism, a second reflecting prism, a first silicon lens, and a second silicon lens. It employs high-precision manufacturing processes to improve product tolerance and meet the requirements of 50G PON tri-mode coexistence wavelength division multiplexing and narrowband demultiplexing, with an isolation greater than 30dB. The Z-Block beam splitter, composed of the rhombic prism and various filters, is used to divide the wavelengths of the system's transmitter and receiver. It can also cooperate with the reflecting prism to narrowband demultiplex multiple system receiver wavelengths to corresponding detectors. The integrated optical port component of this wavelength division multiplexer serves as the assembly carrier for all optical components. Its highly integrated structure and compact design, achieved through optical simulation, ensure the integration of multiple 50G PON channels and enable coexistence of three generations of PON.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a wavelength division multiplexer for 50G-PON provided by this utility model.

[0018] Figure 2 This utility model provides an overall external axial side of an integrated optical port assembly for 50G-PON. Figure 1 .

[0019] Figure 3 This utility model provides an overall external axial side of an integrated optical port assembly for 50G-PON. Figure 2 .

[0020] Figure 4 This is a structural diagram of the housing of an integrated optical port assembly for 50G-PON provided by this utility model.

[0021] Figure 5 This is a system internal structure diagram of an integrated optical port component for 50G-PON provided by this utility model.

[0022] Figure 6 This utility model provides a schematic diagram of the internal system optical path operation of an integrated optical port component for 50G-PON.

[0023] Figure 7 This is a structural diagram of a cover plate for an integrated optical port assembly for 50G-PON provided by this utility model.

[0024] Figure 8 This utility model provides a schematic diagram of the system wavelength 1342nm emission optical path for an integrated optical port component for 50G-PON.

[0025] Figure 9 This is a schematic diagram of the system wavelength 1490nm emission optical path for an integrated optical port component for 50G-PON provided by an embodiment of the present invention.

[0026] Figure 10 This is a schematic diagram of the system wavelength 1577nm emission optical path for an integrated optical port component for 50G-PON provided by an embodiment of the present invention.

[0027] Figure 11 This is a schematic diagram of a system wavelength 1310nm receiving optical path for an integrated optical port component for 50G-PON provided by an embodiment of this utility model.

[0028] Figure 12 This is a schematic diagram of a system wavelength 1286nm receiving optical path for an integrated optical port component for 50G-PON provided by an embodiment of this utility model.

[0029] Figure 13 This is a schematic diagram of a system wavelength 1270nm receiving optical path for an integrated optical port component for 50G-PON provided by an embodiment of this utility model.

[0030] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Wavelength division multiplexer; 3. Converging lens bracket; 4. Converging lens; 5. Optical port adjustment ring; 6. Optical port end; 7. Cover plate; 8. First laser mating hole; 9. Second laser mating hole; 10. Third laser mating hole; 11. First detector mating hole; 12. Second detector mating hole; 13. Third detector mating hole; 14. Optical port end mating hole; 15. Cover plate mating hole; 16. First diaphragm; 17. Second diaphragm; 18. Third diaphragm; 19. Optical isolator; 20. Collimating lens bracket; 21. Collimating lens; 22. Support substrate; 23. Z-Block beam splitter assembly; 231. First filter 232. Second filter; 233. Third filter; 234. Fourth filter; 235. Fifth filter; 236. Orthographic prism; 24. First reflecting prism; 25. Second reflecting prism; 251. First reflecting surface; 252. Second reflecting surface; 26. Fourth diaphragm; 27. First silicon lens; 28. Second silicon lens; 29. ​​First placement area; 30. Second placement area; 31. Third placement area; 32. Fourth placement area; 33. Fifth placement area; 34. Sixth placement area; 35. Seventh placement area; 36. Eighth placement area; 37. First overflow groove; 38. Second overflow groove; 39. Third overflow groove; 40. Fourth overflow groove. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0032] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0034] Reference Figure 1This utility model provides a wavelength division multiplexer 2 for 50G-PON, including a first reflecting prism 24, a second reflecting prism 25, and an orthographic prism 236; a first filter 231, a third filter 233, and a fifth filter 235 are provided on the first surface of the orthographic prism 236, and a second filter 232 and a fourth filter 234 are provided on the second surface of the orthographic prism 236. The second surface is preferably parallel to the first surface, and at least one face of each filter is in contact with the corresponding surface of the orthographic prism 236; the second filter 231... Filter 231 is located in the reflected light path of the first filter 231, filter 233 is located in the reflected light path of the second filter 232, filter 234 is located in the reflected light path of the third filter 233, and filter 235 is located in the transmitted light path of the fourth filter 234; the first reflecting prism 24 is located in the transmitted light path of the fifth filter 235; the first reflecting surface 251 of the second reflecting prism 25 is located in the transmitted light path of the second filter 232, and the second reflecting surface 252 of the second reflecting prism 25 is located in the transmitted light path of the fourth filter 234. The rhombic prism 236 is preferably a glass substrate. The rhombic prism 236 and each filter form a Z-Block beam splitter 23, used to split the wavelengths of the system's transmitting and receiving ends, and in conjunction with the reflecting prism, to narrow-band split multiple system receiving wavelengths to their corresponding detectors. The adaptive wavelength of each filter in the Z-Block beam splitter 23 is designed according to the actual incident wavelength requirements to ensure that each incident wave can exit from the corresponding filter to the corresponding receiver.

[0035] Furthermore, a first silicon lens 27 is provided on the reflected light path of the first reflecting prism 24; and a second silicon lens 28 is provided on the reflected light path of the second reflecting prism 25. The first silicon lens 27 and the second silicon lens 28 are used to convert the parallel light split by the Z-Block into converging light and converge it to the corresponding detector, thereby reducing energy loss and improving system coupling efficiency.

[0036] Preferably, a fourth diaphragm 26 is provided in the optical path between the first reflecting prism 24 and the first silicon lens 27. The fourth diaphragm 26 is used to block the system incident light at the detector end and cut off the light of other wavelengths, so as to ensure the isolation of the detector end and reduce optical crosstalk.

[0037] Specifically, the wavelength division multiplexer 2 also includes a support substrate 22, preferably a ceramic substrate. The ceramic substrate serves as a carrier for bonding and assembling the Z-Block beam splitter 23, the first reflecting prism 24, the second reflecting prism 25, the fourth diaphragm 26, the first silicon lens 27, and the second silicon lens 28, thereby aligning each optical component along the optical axis, reducing the difficulty of processing and assembly, and ensuring product performance.

[0038] The wavelength division multiplexer 2 integrates a ceramic substrate, a Z-Block beam splitter 23, a first reflecting prism 24, a second reflecting prism 25, a fourth diaphragm 26, a first silicon lens 27, and a second silicon lens 28 as a single component. It adopts a high-precision processing technology to improve product tolerance and meet the requirements of 50G PON tri-mode coexistence wavelength division multiplexing and narrowband wavelength division multiplexing, with an isolation greater than 30dB.

[0039] This utility model also provides an integrated optical port assembly for 50G-PON, including a housing 1 with a mirror cavity and the aforementioned wavelength division multiplexer 2; the wavelength division multiplexer 2 is installed inside the mirror cavity.

[0040] Furthermore, refer to Figure 2-7 The housing 1 is provided with an optical port mating hole 14, a first detector mating hole 11, a second detector mating hole 12, a third detector mating hole 13, and multiple laser mating holes. The mirror cavity is provided with a multiplexing unit for combining the light entering through each laser mating hole into an outgoing multiplexed light. The first filter 231 of the wavelength division multiplexer 2 is located on the optical path of the outgoing multiplexed light. The optical port mating hole 14 is located on the transmission optical path of the first filter 231. The first detector mating hole 11 is located on the reflection optical path of the first reflecting prism 24. The second detector mating hole 12 is located on the reflection optical path of the first reflecting surface 251 of the second reflecting prism 25. The third detector mating hole 13 is located on the reflection optical path of the second reflecting surface 252 of the second reflecting prism 25. The housing 1 serves as the assembly carrier for each optical component, with a highly integrated structure. A small-volume design was achieved through optical simulation, ensuring the integration of multiple channels in the 50G PON.

[0041] Furthermore, a converging lens 4 is provided between the wavelength division multiplexer 2 and the optical port 14; the converging lens 4 is located in the transmission optical path of the first filter 231. The multiplexing unit combines the light entering from each laser port, transmits it through the wavelength division multiplexer 2 to the converging lens 4, and then the converging lens 4 converges the outgoing combined light before transmitting it to the optical port 6 for output. Alternatively, the converging lens 4 converts the diverging light of multiple wavelengths emitted from the optical port 6 into parallel light, transmits it to the wavelength division multiplexer 2, and then each filter in the wavelength division multiplexer 2 reflects / transmits the parallel light of the corresponding wavelength to the corresponding reflecting prism. The reflecting prism reflects the received parallel light to the corresponding detector port. The converging lens 4 ensures that the system light in the wavelength division multiplexer 2 section is parallel light, facilitating narrowband wavelength division of multi-wavelength optical paths and meeting performance requirements.

[0042] Preferably, the converging lens 4 is bonded and fixed on the converging lens bracket 3, and the converging lens bracket 3 is installed in the lens cavity of the housing 1, which facilitates the assembly of the converging lens 4 and reduces the difficulty of the process.

[0043] In a detailed embodiment, the housing 1 can be an assembly integrating eight ports, including a first laser mating hole 8, a second laser mating hole 9, a third laser mating hole 10, a first detector mating hole 11, a second detector mating hole 12, a third detector mating hole 13, an optical port mating hole 14, and a cover plate mating hole 15. The cover plate mating hole 15 is used to make way for the installation of the wavelength division multiplexer 2. A cover plate 7 is fixed at the cover plate mating hole 15 to seal it, preventing external impurities from entering the housing 1 and affecting the optical path of the device, thus ensuring the stability of the optical device. The optical port mating hole 14 is equipped with an optical port adjustment ring 5, used to couple and fix the housing 1 and the optical port 6 together, ensuring the stability of the optical device.

[0044] Specifically, the wavelength division multiplexing unit includes multiple diaphragms, each of which is arranged sequentially along the mirror cavity. The two surfaces of the first diaphragm are respectively aligned with two of the laser mating holes, and the remaining diaphragms are respectively matched with the remaining laser mating holes. The surface of each diaphragm facing the wavelength division multiplexer 2 reflects the incident light, and the other surface of the diaphragm transmits the incident light.

[0045] In a refined embodiment, the beam combining unit includes a first diaphragm 16 and a second diaphragm 17. The first diaphragm 16 is inclined away from the optical port 6. The side of the first diaphragm 16 facing the wavelength division multiplexer 2 is opposite to the second laser mating hole 9, and is used to reflect the light incident on the second laser mating hole 9. The other side of the first diaphragm 16 is opposite to the first laser mating hole 8, and is used to transmit the light incident on the first laser mating hole 8. The second diaphragm 17 is inclined towards the optical port 6. The side of the second diaphragm 17 facing the wavelength division multiplexer 2 is opposite to the third laser mating hole 10, and is used to reflect the light incident on the third laser mating hole 10. The other side of the second diaphragm 17 is opposite to the second laser mating hole 9, and is used to transmit the light incident on the second laser mating hole 9, thereby realizing beam combining.

[0046] Specifically, a third diaphragm 18 is provided between the third receiving detector and the second reflecting prism 25. This diaphragm is used for the third receiving detector to receive light of the corresponding wavelength and to cut off light of other wavelengths, thereby ensuring the optical isolation of the receiving end and preventing light from the transmitting end from entering the detector and causing optical crosstalk.

[0047] Furthermore, an optical isolator 19 is provided on the optical path between the multiplexing unit and the wavelength division multiplexer 2, which is used for unidirectional transmission of light entering the laser through the aperture to prevent light from being reflected back to the laser, interfering with its stability, and ensuring the transmission quality of the optical signal.

[0048] Furthermore, a collimating lens 21 is provided in the optical path between the optical isolator 19 and the wavelength division multiplexer 2 to convert the light beam entering through the laser aperture into parallel light output, facilitating optical path transmission and reducing energy loss. Optionally, the collimating lens 21 is bonded and fixed to the collimating lens bracket 20, which is installed inside the mirror cavity.

[0049] Preferably, the optical parameters of the collimating lens 21 and the converging lens 4 are designed to be matched, which can effectively improve the coupling efficiency between the transmitter and receiver.

[0050] The dimensions of the housing 1, converging lens bracket 3, optical port adjustment ring 5, and cover plate 7 are required to have an angular tolerance of ±0.5° and a dimensional tolerance of ±0.05mm. Local areas are required to undergo root cleaning and flatness treatment to ensure product assembly accuracy.

[0051] In one embodiment, the mirror cavity of the housing 1 is provided with a first placement area 29 for placing the first diaphragm 16, a second placement area 30 for placing the second diaphragm 17, a third placement area 31 for placing the third diaphragm 18, a fourth placement area 32 for placing the optical isolator 19, a fifth placement area 33 for placing the collimating lens holder 20, a sixth placement area 34 for placing the wavelength division multiplexer 2, a seventh placement area 35 for placing the converging lens holder 3, and an eighth placement area 36 for placing the cover plate 7. Optionally, the first placement area 29 has an inclination angle of 45°, and the second placement area 30 has an inclination angle of 45°.

[0052] Each component is bonded to its corresponding placement area. Preferably, the first placement area 29, the second placement area 30, the third placement area 31, and the sixth placement area 34 are respectively provided with a first overflow groove 37, a second overflow groove 38, a third overflow groove 39, and a fourth overflow groove 40, which facilitates the assembly and bonding of the first diaphragm 16, the second diaphragm 17, the third diaphragm 18, and the wavelength division multiplexer 2, and prevents glue overflow from affecting product performance.

[0053] This utility model also provides a 50G-PON optical device, including a laser, a detector and the above-mentioned integrated optical port assembly; the laser and the detector are respectively mounted on the housing 1 of the integrated optical port assembly.

[0054] In one embodiment, the 50G-PON optical device includes an optical port 6, a first laser, a second laser, a third laser, a first detector, a second detector, a third detector, and the aforementioned integrated optical port assembly; the housing 1 is an assembly integrating eight ports, including a first laser mating hole 8, a second laser mating hole 9, a third laser mating hole 10, a first detector mating hole 11, a second detector mating hole 12, a third detector mating hole 13, an optical port mating hole 14, and a cover plate mating hole 15. Each laser and detector is mounted on the housing 1 through its corresponding laser mating hole and detector mating hole. The optical port 6 is mounted in the optical port mating hole 14. Example 1

[0055] This embodiment provides a wavelength division multiplexer 2 for 50G-PON, including a ceramic substrate, a first reflecting prism 24, a second reflecting prism 25, and an orthographic prism 236. A first filter 231, a third filter 233, and a fifth filter 235 are disposed on the first surface of the orthographic prism 236, and a second filter 232 and a fourth filter 234 are disposed on the second surface of the orthographic prism 236. The second surface is parallel to the first surface, and each filter has one face that is in contact with the corresponding surface of the orthographic prism 236. The orthographic prism 236 and the filters form a Z-Block beam splitter 23. The second filter 232 is located on the reflected light path of the first filter 231, the third filter 233 is located on the reflected light path of the second filter 232, and the fourth filter 234 is located on the reflected light path of the third filter 231. In the reflected light path of 233, the fifth filter 235 is located in the transmitted light path of the fourth filter 234; the first reflecting prism 24 is located in the transmitted light path of the fifth filter 235; the first reflecting surface 251 of the second reflecting prism 25 is located in the transmitted light path of the second filter 232, and the second reflecting surface 252 of the second reflecting prism 25 is located in the transmitted light path of the fourth filter 234; a first silicon lens 27 is provided in the reflected light path of the first reflecting prism 24, and a fourth diaphragm 26 is provided in the light path between the first reflecting prism 24 and the first silicon lens 27; a second silicon lens 28 is provided in the reflected light path of the second reflecting prism 25; the Z-Block beam splitter 23, the first reflecting prism 24, the second reflecting prism 25, the fourth diaphragm 26, the first silicon lens 27, and the second silicon lens 28 are bonded to the ceramic substrate.

[0056] This embodiment also provides an integrated optical port assembly for 50G-PON, including a housing 1 with a mirror cavity, a converging lens 4, a multiplexing unit, an optical isolator 19, a collimating lens 21, and the aforementioned wavelength division multiplexer 2.

[0057] The housing 1 is an assembly integrating eight ports, including a first laser mating hole 8, a second laser mating hole 9, a third laser mating hole 10, a first detector mating hole 11, a second detector mating hole 12, a third detector mating hole 13, an optical port mating hole 14, and a cover plate mating hole 15. A cover plate 7 is fixed at the cover plate mating hole 15 to seal the cover plate mating hole 15; the optical port mating hole 14 is provided with an optical port adjustment ring 5.

[0058] The wavelength multiplexing unit, optical isolator 19, collimating lens 21, wavelength division multiplexer 2, and converging lens 4 are arranged sequentially along the optical path inside the mirror cavity of housing 1.

[0059] The converging lens 4 is bonded and fixed to the converging lens bracket 3. The wave combining unit includes a first diaphragm 16 and a second diaphragm 17. The collimating lens 21 is bonded and fixed to the collimating lens bracket 20.

[0060] The first diaphragm 16 is inclined away from the optical port 6. The side of the first diaphragm 16 facing the wavelength division multiplexer 2 is opposite to the second laser mating hole 9, and is used to reflect the light incident on the second laser mating hole 9. The other side of the first diaphragm 16 is opposite to the first laser mating hole 8, and is used to transmit the light incident on the first laser mating hole 8. The second diaphragm 17 is inclined towards the optical port 6. The side of the second diaphragm 17 facing the wavelength division multiplexer 2 is opposite to the third laser mating hole 10, and is used to reflect the light incident on the third laser mating hole 10. The other side of the second diaphragm 17 is opposite to the second laser mating hole 9, and is used to transmit the light incident on the second laser mating hole 9, thereby realizing beam combining and forming an outgoing combined beam.

[0061] Optical isolator 19, collimating lens 21, and first filter 231 of wavelength division multiplexer 2 are sequentially arranged on the optical path of the emitted combined light; converging lens 4 and optical port mating hole 14 are sequentially arranged on the transmission optical path of first filter 231; first detector mating hole 11 is located on the reflection optical path of first reflecting prism 24; second detector mating hole 12 is located on the reflection optical path of first reflecting surface 251 of second reflecting prism 25; third detector mating hole 13 is located on the reflection optical path of second reflecting surface 252 of second reflecting prism 25; a third diaphragm 18 is provided between the third receiving detector and the second reflecting prism 25.

[0062] The housing 1 has a mirror cavity with a first placement area 29 for placing the first diaphragm 16, a second placement area 30 for placing the second diaphragm 17, a third placement area 31 for placing the third diaphragm 18, a fourth placement area 32 for placing the optical isolator 19, a fifth placement area 33 for placing the collimating lens holder 20, a sixth placement area 34 for placing the wavelength division multiplexer 2, a seventh placement area 35 for placing the converging lens holder 3, and an eighth placement area 36 (with cover plate mating hole 15) for placing the cover plate 7. The first placement area 29 and the second placement area 30 are tilted at 45°. The first placement area 29, the second placement area 30, the third placement area 31, and the sixth placement area 34 are respectively provided with a first overflow groove 37, a second overflow groove 38, a third overflow groove 39, and a fourth overflow groove 40. Each component is bonded to its corresponding placement area, and the overflow grooves prevent glue from overflowing and affecting product performance.

[0063] The above-mentioned integrated optical port assembly for 50G-PON is assembled using the following steps.

[0064] Step 1: Use high-reliability epoxy resin adhesive to bond the Z-Block beam splitter 23, the first reflecting prism 24, the second reflecting prism 25, the fourth diaphragm 26, the first silicon lens 27, and the second silicon lens 28 to the ceramic substrate. The shear force and reliability meet industry requirements and ensure product tolerance. This step assembles the wavelength division multiplexer 2.

[0065] Step 2: Use high-reliability epoxy resin adhesive to bond the converging lens 4 to the converging lens bracket 3, and bond and fix the collimating lens 21 to the collimating lens bracket 20.

[0066] Step 3: The first diaphragm 16, the second diaphragm 17, the third diaphragm 18, the optical isolator 19, the collimating lens holder 20, the wavelength division multiplexer 2, and the converging lens holder 3 are respectively bonded to the first placement area 29 to the seventh placement area 35 inside the mirror cavity of the housing 1 using high-reliability epoxy resin adhesive.

[0067] Step 4: Fix the cover plate 7 to the eighth placement area 36 of the housing 1 by parallel sealing welding.

[0068] Step 5: Use laser welding to couple and fix the optical port adjustment ring 5 and the optical port end 6 to the optical port end mating hole 14 of the housing 1 to ensure the stability of the product structure.

[0069] This embodiment also provides a 50G-PON optical device, including an optical port 6, a first laser, a second laser, a third laser, a first detector, a second detector, a third detector, and the aforementioned integrated optical port assembly. The first laser is mounted on the housing 1 through a first laser mating hole 8, the second laser is mounted on the housing 1 through a second laser mating hole 9, the third laser is mounted on the housing 1 through a third laser mating hole 10, the first detector is mounted on the housing 1 through a first detector mating hole 11, the second detector is mounted on the housing 1 through a second detector mating hole 12, the third detector is mounted on the housing 1 through a third detector mating hole 13, and the optical port 6 is mounted on the optical port mating hole 14, achieving 50G PON three-mode integration. The first laser can emit light with a wavelength of 1342nm, the second laser can emit light with a wavelength of 1490nm, and the third laser can emit light with a wavelength of 1577nm. The first detector can receive light with a wavelength of 1310nm, the second detector can receive light with a wavelength of 1286nm, and the third detector can receive light with a wavelength of 1270nm.

[0070] like Figure 8 As shown, the emitted light with a wavelength of 1342nm enters through the first laser mating hole 8, is transmitted through the first diaphragm 16 and the second diaphragm 17, and then passes through the optical isolator 19, collimating lens 21, wavelength division multiplexer 2, and converging lens 4 before reaching the output of the optical port mating hole 14.

[0071] like Figure 9 As shown, the emitted light with a wavelength of 1490nm enters through the second laser mating hole 9, is reflected by the first diaphragm 16, and transmitted through the second diaphragm 17. After passing through the optical isolator 19, collimating lens 21, wavelength division multiplexer 2, and converging lens 4, it reaches the output of the optical port mating hole 14.

[0072] like Figure 10 As shown, the emitted light with a wavelength of 1577nm enters through the third laser mating hole 10, is reflected by the second diaphragm 17, and then passes through the optical isolator 19, collimating lens 21, wavelength division multiplexer 2, and converging lens 4 before reaching the output of the optical port mating hole 14.

[0073] like Figure 11 As shown, the received light with a wavelength of 1310nm enters through the optical port 14, is converted into parallel light by the converging lens 4, and is transmitted to the wavelength division multiplexer 2. After being reflected four times by the first filter 231, the second filter 232, the third filter 233, and the fourth filter 234 of the wavelength division multiplexer 2, it is transmitted to the first reflecting prism 24 by the fifth filter 235. The reflected light from the first reflecting prism 24 is transmitted through the fourth diaphragm 26 and the first silicon lens 27 into the first detector 11.

[0074] like Figure 12As shown, the received light with a wavelength of 1286nm enters through the optical port 14, is converted into parallel light by the converging lens 4, and is transmitted to the wavelength division multiplexer 2. After being reflected by the first filter 231 of the wavelength division multiplexer 2, it is transmitted through the second filter 232 to the first reflecting surface 251 of the second reflecting prism 25. After reflection, it is transmitted through the second silicon lens 28 into the second detector 12.

[0075] like Figure 13 As shown, the received light with a wavelength of 1270nm enters through the optical port 14, is converted into parallel light by the converging lens 4, and is transmitted to the wavelength division multiplexer 2. After being reflected three times by the first filter 231, the second filter 232, and the third filter 233 of the wavelength division multiplexer 2, it is transmitted through the fourth filter 234 to the second reflecting surface 252 of the second reflecting prism 25, and is reflected out of the third detector 13.

[0076] The above examples are merely illustrative of this utility model and do not constitute a limitation on the scope of protection of this utility model. All designs that are the same as or similar to this utility model are within the scope of protection of this utility model.

Claims

1. A wavelength division multiplexer for 50G-PON, characterized by: It comprises a first reflecting prism (24), a second reflecting prism (25) and a rhomboid prism (236); the first surface of the rhomboid prism (236) is provided with a first filter (231), a third filter (233) and a fifth filter (235); the second surface of the rhomboid prism (236) is provided with a second filter (232) and a fourth filter (234); the second filter (232) is located on the reflected light path of the first filter (231), the third filter (233) is located on the reflected light path of the second filter (232), the fourth filter (234) is located on the reflected light path of the third filter (233), and the fifth filter (235) is located on the transmitted light path of the fourth filter (234); the first reflecting prism (24) is located on the transmitted light path of the fifth filter (235); the first reflecting surface (251) of the second reflecting prism (25) is located on the transmitted light path of the second filter (232), and the second reflecting surface (252) of the second reflecting prism (25) is located on the transmitted light path of the fourth filter (234).

2. The wavelength division multiplexer for 50G-PON according to claim 1, characterized by: The reflected light path of the first reflecting prism (24) is provided with a first silicon lens (27); the reflected light path of the second reflecting prism (25) is provided with a second silicon lens (28).

3. The WDM for 50G-PON according to claim 1, wherein: It further comprises a support substrate (22); the first reflecting prism (24), the second reflecting prism (25) and the rhomboid prism (236) are all mounted on the support substrate (22).

4. An optical port integrated assembly for 50G-PON, characterized in that: It comprises a housing (1) with a mirror cavity and the wavelength division multiplexer (2) for 50G-PON according to any one of claims 1-3; the wavelength division multiplexer (2) is installed in the mirror cavity. 5.The optical port integrated assembly for 50G-PON of claim 4, wherein: The housing (1) is provided with a light port end matching hole (14), a first detector matching hole (11), a second detector matching hole (12), a third detector matching hole (13) and a plurality of laser matching holes; the mirror cavity is provided with a combining unit for combining the light entering through each laser matching hole into outgoing combined wave light; the first filter (231) of the wavelength division multiplexer (2) is located on the light path of the outgoing combined wave light; the light port end matching hole (14) is located on the transmitted light path of the first filter (231); the first detector matching hole (11) is located on the reflected light path of the first reflecting prism (24); the second detector matching hole (12) is located on the reflected light path of the first reflecting surface (251) of the second reflecting prism (25); and the third detector matching hole (13) is located on the reflected light path of the second reflecting surface (252) of the second reflecting prism (25). 6.The optical port integrated assembly for 50G-PON of claim 5, wherein: A converging lens (4) is arranged between the wavelength division multiplexer (2) and the light port end matching hole (14); the converging lens (4) is located on the transmitted light path of the first filter (231). 7.The optical port integrated assembly for 50G-PON of claim 5, wherein: The combination unit comprises a plurality of diaphragms, each of which is arranged along the mirror cavity in sequence, two diaphragm surfaces of the first diaphragm are respectively opposite to two laser matching holes, and the remaining diaphragms are respectively and one-to-one matched with the remaining laser matching holes. 8.The optical port integrated assembly for 50G-PON of claim 5, wherein: An optical isolator (19) is arranged on the optical path between the combination unit and the wavelength division multiplexer (2). 9.The optical port integrated assembly for 50G-PON of claim 8, wherein: A collimating lens (21) is arranged on the optical path between the optical isolator (19) and the wavelength division multiplexer (2).

10. A 50G-PON optical device, characterized by: The optical port integrated assembly comprises a laser, a detector, and the optical port integrated assembly of any one of claims 4-9; the detector and the laser are respectively mounted on the shell (1) of the optical port integrated assembly.

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