Three-mode coexistence coaxial wave combining optical device
By designing a three-mode coexisting coaxial beam combining optical device and adopting an optical path structure with a 45° diaphragm and beam splitter, the complexity and optical crosstalk problems of existing optical devices in the coexistence of three generations of PON are solved, realizing the miniaturization of optical devices and high-performance 50G PON applications.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-03-06
AI Technical Summary
Existing optical devices have complex structures when achieving coexistence of three generations of PON, which cannot guarantee optical crosstalk performance and make it difficult to meet the high bandwidth and low latency requirements of 50G PON.
Design a three-mode coexisting coaxial beam combining optical device. It uses a first emitting laser, a beam combining laser, a receiving detector and a beam combining detector inside the housing. Beam combining and beam splitting are achieved through a 45° diaphragm and beam splitting components. The beam splitting components are fixed by an optical isolator and a ceramic substrate to ensure unidirectional transmission and narrowband beam splitting of the optical path.
It achieves simple and miniaturized optical device structure, meets the technical specifications of 50G PON, realizes a smooth upgrade from GPON and 10G PON to 50G PON, reduces optical crosstalk, and improves the isolation and reliability of optical path.
Smart Images
Figure CN223977448U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of optical communication technology, specifically relating to a three-mode coexisting coaxial wave combining optical device. Background Technology
[0002] 50G PON is a significant evolution direction for optical access networks. Through its high-order modulation and DSP technologies, it meets the demands for high bandwidth, high capacity, and low latency, and has broad application prospects in 5G fronthaul and backhaul, home bandwidth, enterprise leased lines, and smart cities. It is one of the core technologies of future optical communication networks. To reuse existing ODN networks and achieve tri-mode coexistence with existing OLT interface boards, optical devices supporting three generations of PON need to be designed. However, to simultaneously support three generations of PON coexistence with existing optical devices, multiple optical modules are required, resulting in a complex structure and compromising performance in preventing optical crosstalk. Utility Model Content
[0003] The purpose of this invention is to provide a three-mode coexisting coaxial wave combining optical device, which can at least solve some of the defects existing in the prior art.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A tri-mode coexisting coaxial beam combining optical device includes a housing and a first emitting laser, a beam combining laser that couples out beams of different wavelengths, a first receiving detector, a beam combining detector that receives beams of different wavelengths, and an optical port disposed on the housing. The output end of the first emitting laser is aligned with and coaxially disposed with the optical port to form a main optical path. A 45° diaphragm is arranged on the main optical path. The beam combining laser is located beside the main optical path, and its output optical path intersects the main optical path perpendicularly. The output ends of the first emitting laser and the beam combining laser are respectively facing the two mirror surfaces of the 45° diaphragm. The first receiving detector and the beam combining detector are respectively located on both sides of the main optical path. The housing is provided with a beam splitting component that can split the light incident from the optical port to the first receiving detector and the beam combining detector.
[0006] Furthermore, the beam splitting assembly includes a glass carrier, which is obliquely arranged within the housing. A first optical lens is disposed on the side of the glass carrier away from the optical port, for transmitting light emitted by the first emitting laser and the multiplexing laser, and reflecting light emitted from the optical port. A reflective inclined surface is provided on the side of the glass carrier near the optical port for receiving the light reflected by the first optical lens and reflecting it to the side of the multiplexing detector. A second optical lens is disposed on the glass carrier corresponding to the first receiving detector. A plurality of filters corresponding to different wavelengths of light from the multiplexing detector are disposed on the side of the glass carrier near the multiplexing detector.
[0007] Furthermore, the main optical path is also provided with an optical isolator for unidirectional light output from the first emitting laser and the combined laser.
[0008] Furthermore, the beam splitter and the optical isolator are fixed on the ceramic substrate.
[0009] Furthermore, an adjustment window is provided on the housing corresponding to the beam splitter and the optical isolator, and the adjustment window is provided with a cover plate.
[0010] Furthermore, the first emitting laser, the wave-combining laser, and the optical port are respectively coupled and fixed to the housing via a first emission adjustment ring, a second emission adjustment ring, and an optical port adjustment ring.
[0011] Furthermore, a converging lens is provided at one end of the main optical path near the optical port for converging the light emitted from the first emitting laser and the combined laser onto the optical port.
[0012] Furthermore, a 0° filter is provided between the first receiving detector and the beam splitting component.
[0013] Furthermore, both the first emitting laser and the multiplexing laser have built-in collimating lenses that convert the laser light emitted into parallel light, and both the first receiving detector and the multiplexing detector have built-in beam converging lenses that converge the parallel light incident on the detector onto the photosensitive surface of the detector.
[0014] Furthermore, both the first emitting laser and the wave-combining laser have a built-in TEC cooler.
[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0016] The three-mode coexisting coaxial multiplexing optical device provided by this utility model has a simple structure. It achieves miniaturization of the optical device structure size through the multiplexing design of coaxial TO, and meets the technical requirements of 50G three-mode coexistence, realizing a smooth upgrade and evolution from GPON and 10G PON to 50G PON.
[0017] The present invention will be further described in detail below with reference to the accompanying drawings. Attached Figure Description
[0018] Figure 1 This is an external axonometric view of the three-mode coexisting coaxial wave combining optical device of this utility model;
[0019] Figure 2 This is a schematic diagram of the internal structure of the three-mode coexisting coaxial wave combining optical device of this utility model;
[0020] Figure 3 This is a schematic diagram of the internal optical path of the three-mode coexisting coaxial wave combining optical device of this utility model;
[0021] Figure 4 This is a schematic diagram of the beam splitting component in the three-mode coexisting coaxial beam combining optical device of this utility model;
[0022] Figure 5 This is a schematic diagram of the cover plate structure in the three-mode coexisting coaxial wave combining optical device of this utility model;
[0023] Figure 6 This is a schematic diagram of the emission optical path of the first emitting laser in an embodiment of this utility model;
[0024] Figure 7 This is a schematic diagram of the laser path of one wavelength output by the laser combiner in this embodiment of the present invention;
[0025] Figure 8 This is a schematic diagram of another wavelength laser optical path of the laser combining laser in this embodiment of the present invention;
[0026] Figure 9 This is a schematic diagram of the receiving optical path of the first receiving detector in an embodiment of this utility model;
[0027] Figure 10 This is a schematic diagram of the receiving optical path of the multiplexer detector in an embodiment of this utility model.
[0028] Explanation of reference numerals in the attached drawings: 1. Housing; 2. First transmitting adjustment ring; 3. First transmitting laser; 4. Second transmitting adjustment ring; 5. Laser combining laser; 6. First receiving detector; 7. Optical port adjustment ring; 8. Optical port; 9. Cover plate; 10. Laser combining detector; 11. 45° diaphragm; 12. Optical isolator; 13. 0° filter; 14. Lens bracket; 15. Converging lens; 16. Beam splitter assembly; 17. Ceramic substrate; 18. Glass carrier; 19. First optical lens; 20. Second optical lens; 21. Reflecting slope; 22. First filter; 23. Second filter. Detailed Implementation
[0029] 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.
[0030] 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.
[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, abutting connections, or integral connections. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0032] 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.
[0033] like Figures 1 to 5As shown, this embodiment provides a tri-mode coaxial multiplexing optical device, including a housing 1, a first emitting laser 3, a multiplexing laser 5, a first receiving detector 6, a multiplexing detector 10, and an optical port 8. The housing 1 has ports for mounting the first emitting laser 3, the multiplexing laser 5, the first receiving detector 6, the multiplexing detector 10, and the optical port 8. The housing 1 serves as an assembly carrier for the various optical components, ensuring the multi-channel integration of the 50G PON optical device. In this embodiment, the housing 1 is designed as a generally cuboid structure. The ports of the first emitting laser 3 and the optical port 8 are respectively located on the left and right end faces of the housing 1, the ports of the first receiving detector 6 and the multiplexing detector 10 are respectively located on the upper and lower end faces of the housing 1, and the port of the multiplexing laser 5 is located on the upper and lower end faces of the housing 1. The output end of the first emitting laser 3 is aligned with and coaxially arranged with the optical port 8. The optical path from the first emitting laser 3 to the optical port 8 is the main optical path. The beam emitted by the first emitting laser 3 is defined as the first emitted light. The wave combiner 5 can couple and output beams of different wavelengths. In this embodiment, the wave combiner 5 can output two wavelength beams, defined as the second emitted light and the third emitted light, respectively. The two wavelength beams are coupled and combined for output. The wave combiner 5 is located beside the main optical path, and its output optical path intersects the main optical path perpendicularly. A 45° diaphragm 11 is arranged on the main optical path. The output ends of the first emitting laser 3 and the wave combiner 5 are respectively facing the two mirror surfaces of the 45° diaphragm 11. The beam emitted by the first emitting laser 3 is transmitted through the 45° diaphragm 11 and the beam emitted by the wave combiner 5 is reflected, thereby realizing the wave combination of the output beams of the first emitting laser 3 and the wave combiner 5, which are then output from the optical port 8. For a multi-wavelength beam entering from the optical port 8, the first receiving detector 6 and the multiplexing detector 10 are located on both sides of the main optical path, that is, on two opposite sides of the housing 1. The multiplexing detector 10 is used to receive beams of different wavelengths. In this embodiment, the multiplexing detector 10 can receive two wavelength beams. The two wavelength beams are split in the multiplexing detector 10 and output through two channels. The housing 1 is provided with a beam splitting component 16. The beam splitting component 16 splits the multi-wavelength beam entering from the optical port 8. The beams of different wavelengths are respectively incident on the first receiving detector 6 and the multiplexing detector 10, realizing narrowband beam splitting of the three-channel beam.
[0034] As one specific implementation method, such as Figure 3 and Figure 4As shown, the beam splitting assembly 16 includes a glass carrier 18, which is inclinedly arranged inside the housing 1. The inclined direction is upward from the side of the first emitting laser 3 towards the side of the optical port 8, and the inclination angle is designed according to the specific actual situation. A first optical lens 19 is provided on the side of the glass carrier 18 away from the optical port 8. The first optical lens 19 is arranged close to the side of the glass carrier 18 and is used to transmit the light emitted by the first emitting laser 3 and the wave-combining laser 5 and reflect the light emitted by the optical port 8. A reflective inclined surface 21 is provided on the side of the glass carrier 18 near the optical port 8 for receiving the light reflected by the first optical lens 19 and reflecting it to the side of the wave-combining detector 10. A second optical lens 20 is provided on the glass carrier 18 corresponding to the first receiving detector 6. A plurality of filters corresponding to different wavelengths of light from the wave-combining detector 10 are provided on the side of the glass carrier 18 near the wave-combining detector 10. Specifically, the beams emitted by the first emitting laser 3 and the multiplexing laser 5 are combined by the 45° diaphragm 11, then transmitted sequentially through the first optical lens 19 and the glass carrier 18, and output from the optical port 8. For multi-wavelength beams entering from the optical port 8, they first pass through the glass carrier 18 and enter the first optical lens 19, are reflected by the first optical lens 19, and then re-enter the glass carrier 18 and are incident on the reflecting slope 21. The beams are then reflected by the reflecting slope 21 to the multiplexing detector 10 side of the glass carrier 18. In this embodiment, the multiplexing detector 10 receives two different wavelength beams as an example. At this time, two filters are set on the glass carrier 18 corresponding to the two different wavelengths received by the multiplexing detector 10. The first filter 22 and the second filter 23 are respectively defined. A multi-wavelength beam reflected by the reflecting slope 21 passes through the first filter 22, and is transmitted through the corresponding wavelength band of the first filter 22, while blocking other wavelength bands. These blocked wavelength bands undergo multiple reflections between the upper and lower surfaces within the glass carrier 18 before entering the second filter 23, where they are transmitted through the corresponding wavelength band. Both wavelength bands transmitted through the first filter 22 and the second filter 23 enter the combiner detector 10. The remaining wavelength bands continue to be reflected within the glass carrier 18 to the second optical lens 20, and then enter the first receiver detector 6. Optionally, the second optical lens 20 is a right-angled triangular prism, with one right-angled side attached to the surface of the glass carrier 18. The beam emitted from the glass carrier 18 passes through the right-angled side of the second optical lens 20 and enters the inclined side of the second optical lens 20, where it is refracted and enters the first receiver detector 6. This embodiment employs a beam splitter design at the optical device receiver, which can effectively perform narrowband beam splitting in the optical path, resulting in a receiver isolation greater than 35dB.
[0035] Optimized implementation methods, such as Figure 2 and Figure 3As shown, an optical isolator 12 is also provided on the main optical path. The optical isolator 12 is arranged between the 45° diaphragm 11 and the beam splitter 16 for unidirectional light output of the first emitting laser 3 and the beam combiner 5, to prevent light reflection from affecting the laser performance and to improve return loss.
[0036] Preferred, such as Figure 2 As shown, a ceramic substrate 17 is provided inside the housing 1. The beam splitter 16 and the optical isolator 12 are fixed on the ceramic substrate 17. The position and height of the optical isolator 12 and the beam splitter 16 can be adjusted by the ceramic substrate 17 to facilitate optical path coupling.
[0037] Furthermore, to facilitate the operation of adjusting the position and height of the optical isolator 12 and the beam splitter 16, such as... Figure 1 and Figure 5 As shown, an adjustment window can be provided on the housing 1 at the location corresponding to the beam splitter 16 and the optical isolator 12. In order to prevent external impurities from entering the housing 1 and affecting the optical path of the device, a cover plate 9 is provided on the adjustment window to seal the housing and ensure the reliability of the optical device.
[0038] Optimized implementation methods, such as Figure 2 As shown, a converging lens 15 is provided at one end of the main optical path near the optical port 8, which is used to converge the light emitted from the first emitting laser 3 and the wave combiner laser 5 to the output of the optical port 8, and can convert the light beam incident on the optical port 8 into parallel light input. Optionally, the converging lens 15 is fixed in the housing 1 by a lens bracket 14.
[0039] Optimized implementation methods, such as Figure 2 As shown, a 0° filter 13 is provided between the first receiving detector 6 and the beam splitter 16. This filter is used to receive the beam of the corresponding wavelength through the first receiving detector 6, while blocking beams of other wavelengths, thus ensuring the optical isolation of the receiving end and reducing optical crosstalk from the transmitting end to the receiving end.
[0040] Preferably, the wave combiner detector 10 has a built-in 0° diaphragm to isolate other wavebands, reduce optical crosstalk, and ensure the isolation of the receiver.
[0041] In an optimized configuration, the first emitting laser 3, the wave-combining laser 5, and the optical port 8 are coupled and fixed to the housing 1 via the first emission adjustment ring 2, the second emission adjustment ring 4, and the optical port adjustment ring 7, respectively, to ensure structural stability and the reliability of the optical devices.
[0042] Preferably, both the first emitting laser 3 and the multiplexing laser 5 have built-in collimating lenses that can convert the emitted laser light into parallel light, facilitating optical path transmission and reducing optical path energy loss. Both the first receiving detector 6 and the multiplexing detector 10 have built-in beam converging lenses that can focus the parallel light incident on the detector onto the detector's photosensitive surface, improving coupling efficiency.
[0043] Preferably, both the first emitting laser 3 and the wave combiner laser 5 have built-in TEC coolers, which can effectively control the laser operating temperature and ensure the stability of the laser output wavelength.
[0044] Preferably, the first transmitting laser 3, the multiplexing laser 5, the first receiving detector 6, and the multiplexing detector 10 are all hermetically sealed to ensure that external moisture and other gases cannot enter the TO and affect the chip performance, thus ensuring the long-term reliability of the product.
[0045] The optical path structures of each component in the three-mode coexisting coaxial wave combiner optical device of this embodiment are described in detail below, such as... Figures 6 to 10 As shown.
[0046] like Figure 6 The diagram shows the first emission optical path of the first emitting laser 3. The first emitting laser 3 emits parallel light of 1342nm, which passes through the 45° diaphragm 11, and is transmitted sequentially through the optical isolator 12 and the beam splitter 16, and then to the converging lens 15, which converts the parallel light into a converged light and outputs it through the optical port 8.
[0047] like Figure 7 The diagram shows the second emission optical path of the wave combiner laser 5. The second emission laser in the wave combiner laser 5 emits parallel light of 1490nm, which is turned over by the internal optical path of TO to reach the 45° diaphragm 11. The light is transmitted through the optical isolator 12 and the beam splitter 16 in sequence, and then to the converging lens 15 to convert the parallel light into a converged light and enter the optical port 8 for output.
[0048] like Figure 8 The diagram shows the third emission path of the wave combiner laser 5. The third emission laser in the wave combiner laser 5 emits parallel light of 1577nm, which passes through the 45° diaphragm 11, and is transmitted sequentially through the optical isolator 12 and the beam splitter 16, and then to the converging lens 15 to convert the parallel light into a converged light and enter the optical port 8 for output.
[0049] like Figure 9 The diagram shows the optical path of the first receiving detector 6. The optical port 8 emits light at wavelengths of 1310nm and 1286nm and 1270nm. The light is converted into parallel light by the converging lens 15 and transmitted to the beam splitter 16 for optical path splitting. The split 1310nm wavelength light is sent to the 0° filter 13 and then transmitted into the first receiving detector 6.
[0050] Figure 10The diagram shows the receiving optical path of the multiplexer 10. The optical port 8 emits light at wavelengths of 1310nm and 1286nm and 1270nm respectively. The light is converted into parallel light by the converging lens 15 and transmitted to the beam splitter 16 for optical path splitting. The split 1286nm and 1270nm wavelength light enter the second and third receiving detectors of the multiplexer 10 respectively.
[0051] The assembly process of the three-mode coexisting coaxial wave-combining optical device in this embodiment is as follows:
[0052] Step 1: The housing 1 is used as a carrier for bonding the optical components of the transmitter and receiver. The assembly sequence of the optical components is as follows: ceramic substrate 17, beam splitter 16, optical isolator 12, lens bracket 14, converging lens 15, 45° diaphragm 11, 0° filter 13, cover plate 9.
[0053] Step 2: Couple and fix the optical port 8 and the optical port adjustment ring 7 to the first component assembled in step 1. This step assembles the second component.
[0054] Step 3: Couple and fix the first emitting laser 3 and the first emitting adjustment ring 2 onto the second component assembled in step 2. This step assembles the third component.
[0055] Step 4: Couple and fix the wave combiner laser 5 and the second emission adjustment ring 4 onto the third component assembled in step 3. This step assembles the fourth component.
[0056] Step 5: Install the first receiving detector 6 onto the fourth component assembled in step 4. This step assembles the fifth component.
[0057] Step 6: Install the multiplexer 10 onto the fifth component assembled in step 5.
[0058] The ceramic substrate 17, beam splitter 16, optical isolator 12, lens bracket 14, converging lens 15, 45° diaphragm 11, 0° filter 13, first receiving detector 6, and multiplexing detector 10 are bonded with high-reliability epoxy resin adhesive, and their shear strength and reliability meet industry requirements. The cover plate 9 and the housing 1 are welded and fixed using a parallel sealing welding process, which ensures the stability of the product. The optical port 8 and the optical port adjustment ring 7, the first emitting laser 3 and the first emitting adjustment ring 2, and the multiplexing laser 5 and the second emitting adjustment ring 4 are fixed by laser welding, which ensures the structural strength and reliability of the optical devices.
[0059] 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 invention.
Claims
1. A three-mode coexistence in-line combiner optical device, characterized by: The application relates to a laser module, which comprises a shell, a first laser emitter arranged on the shell, a combined laser for coupling output of light beams of different wavelengths, a first receiving detector, a combined detector for receiving light beams of different wavelengths and a light port; the light emitting end of the first laser emitter is coaxially arranged with the light port to form a main light path, a 45-degree diaphragm is arranged on the main light path, the combined laser is arranged on the side of the main light path, the light emitting end of the first laser emitter and the light emitting end of the combined laser are respectively directed to the two sides of the mirror surface of the 45-degree diaphragm, the first receiving detector and the combined detector are respectively arranged on the two sides of the main light path, and a light splitting component for splitting the light incident from the light port to the first receiving detector and the combined detector is arranged in the shell. 2.The three-mode coexistence coherent combining optical device according to claim 1, wherein: The light splitting component comprises a glass carrier, the glass carrier is arranged in the shell in an inclined mode, a first optical lens is arranged on the side of the glass carrier away from the light port, the first optical lens is used for transmitting the light emitted by the first laser emitter and the combined laser and reflecting the light emitted by the light port, a reflection inclined surface is arranged on the side of the glass carrier close to the light port, the reflection inclined surface is used for receiving the light reflected by the first optical lens and reflecting the light to the side of the combined detector, a second optical lens is arranged on the glass carrier corresponding to the first receiving detector, and a plurality of filter pieces corresponding to different light wavelengths of the combined detector are arranged on the side of the glass carrier close to the combined detector.
3. The tri-mode coexisting coaxial wave combining optical device as described in claim 1, characterized in that: An optical isolator for one-way light emission of the first laser emitter and the combined laser is arranged on the main light path.
4. The three-mode coexistence coherent combining optical device of claim 3, wherein: The light splitting component and the optical isolator are fixed on a ceramic substrate.
5. The tri-mode coexisting coaxial wave combining optical device as described in claim 3, characterized in that: An adjusting window is arranged on the shell corresponding to the light splitting component and the optical isolator, and a cover plate is arranged on the adjusting window. 6.The three-mode coexistence coherent combining optical device according to claim 1, wherein: The first laser emitter, the combined laser and the light port are coupled and fixed on the shell through a first emission adjusting ring, a second emission adjusting ring and a light port adjusting ring respectively. 7.The three-mode coexistence coherent combining optical device according to claim 1, wherein: A converging lens for converging the light emitted by the first laser emitter and the combined laser to the light port is arranged on the main light path close to the light port. 8.The three-mode coexistence coherent combining optical device according to claim 1, wherein: A 0-degree filter piece is arranged between the first receiving detector and the light splitting component. 9.The three-mode coexistence coherent combining optical device according to claim 1, wherein: The first laser emitter and the combined laser are both internally provided with a collimating lens for converting the light emitted by the laser into parallel light, and the first receiving detector and the combined detector are both internally provided with a light beam converging lens for converging the parallel light incident to the detector to the light sensitive surface of the detector.
10. The three-mode coexistence coherent combining optical device of claim 1, wherein: The first laser emitter and the combined laser are both internally provided with a TEC cooler.