Narrow-band single-fiber four-way wave combining optical device

Abstract

The utility model provides a narrow-band single-fiber four-way wave combining optical device, which comprises a cube, and an optical port end, a laser end and a detector end which are arranged on three side surfaces of the cube, and the interior of the cube further comprises a low-optical-level wave dividing assembly, a double-channel free space optical isolator and C-l ens. The laser end emits two parallel wave band lights, the two parallel wave band lights are combined into one path after being isolated by the double-channel free space optical isolator and being refracted and reflected by the low-optical-level optical branching assembly for multiple times, and the C-lens converts the parallel lights into convergent lights and then couples and converges the convergent lights to the optical port end. Receiving wave band light input from the light port end is converted into parallel light through C-l ens, the parallel light enters the low-optical-level wave division assembly and is divided into two paths to enter the detector end after being refracted and reflected for multiple times, and the two paths of parallel receiving wave band light are converged to the two detector photosensitive surfaces through the detector end respectively. According to the narrow-band single-fiber four-way wave combining optical device, wave combining and wave dividing optical paths are optimized through the low-optical-level optical wave dividing assembly, the coupling efficiency and the isolation degree of the device are improved, crosstalk is reduced, meanwhile, all ports and structures are highly integrated, and the miniaturization design of the optical device is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical communication, and particularly relates to a narrow-band single-fiber four-way multiplexing optical device. Background Technique

[0002] The four-port optical device Quad-OSA for ComboPON OLT integrates two sets of transceiver devices in one optical device: namely, the 2.5G 1490nm DFB laser and 1310nm APD of traditional GPON, and the 10G 1577nm EML laser and 1270nm APD of XGPON, and uses WDM multiplexing to couple to the output optical port, and the conventional transmission distance is 20KM. At present, the board space for optical modules is limited. To solve this problem, a miniaturized single-fiber four-way multiplexing structure is designed, and at the same time, a COMBOPON device with high output power, narrow-band and high isolation is realized, so that the optical module has higher sensitivity, longer transmission distance and more board space. Content of the Utility Model

[0003] The purpose of the utility model is to provide a narrow-band single-fiber four-way multiplexing optical device, which ensures a miniaturized and dense design, and at the same time realizes the performance of high output power, low crosstalk and high isolation. The technical solution is as follows:

[0004] A narrow-band single-fiber four-way multiplexing optical device includes a cube, an optical port end, a laser end and a detector end installed on the side of the cube, and also includes a micro-optical demultiplexing component, a two-channel free-space optical isolator and a C-lens inside the cube;

[0005] Two lasers and two collimating lenses are fixedly installed at the laser end through a first mounting bracket, and a converging lens and two filter plates are fixedly installed at the detector end through a second mounting bracket.

[0006] Further, the optical port end and the laser end are arranged oppositely, the two-channel free-space optical isolator is connected to the laser end, the C-lens is connected to the optical port end, and the micro-optical demultiplexing component is connected between the two-channel free-space optical isolator and the C-lens.

[0007] Further, the laser end includes a laser end housing and a first mounting bracket, a first laser, a second laser, a first collimating lens and a second collimating lens inside the laser end housing. The first mounting bracket is fixed inside the laser end housing, the first laser and the second laser are installed in parallel on both sides of the first mounting bracket, the first collimating lens is installed at the front end of the first laser, and the second collimating lens is installed at the front end of the second laser.

[0008] Further, the detector end includes a detector end housing and a second mounting bracket, a converging lens, a first filter, and a second filter inside the detector end housing. The second mounting bracket is fixed inside the detector end housing. The converging lens is mounted above the second mounting bracket. The first filter and the second filter are arranged side by side on the side of the converging lens facing the inside of the cube.

[0009] Further, the port of the laser end is sealed with a flat window cap, and the port of the detector end is sealed with a flat window cap.

[0010] Further, both the first filter and the second filter are 0° filters.

[0011] Further, the incident angle of the micro-optical multiplexing component is 13.5°.

[0012] Further, an opening is provided on the top surface of the cube, and a cover plate is provided at the opening.

[0013] The narrowband single-fiber four-way combined optical device provided by the present invention has the following beneficial effects:

[0014] 1. For the narrowband single-fiber four-way combined optical device provided by the present invention, two lasers at the laser end are mounted back-to-back through a mounting bracket, and the divergent light is converted into collimated light through a lens, reducing the lengths of the laser end and the cube. At the same time, the micro-optical multiplexing component uses a secondary reflection form when combining two beams of light, further reducing the length of the cube and realizing the miniaturized design of the optical device.

[0015] 2. For the narrowband single-fiber four-way combined optical device provided by the present invention, the micro-optical multiplexing component separates the transmitted and received two beams of light, preventing the light emitted by the laser from entering the detector, thereby reducing the optical crosstalk of the device. At the same time, 0° filters are added inside the detector end, and the isolation degree between two channels can reach 40 dB, improving the isolation degree of the device.

[0016] 3. For the narrowband single-fiber four-way combined optical device provided by the present invention, the optical path of the detector end is placed behind the optical path of the laser end. In this way, the light emitted by the laser, after being collimated by the lens, only needs to pass through one isolator and one micro-optical multiplexing component to reach the optical port end, reducing the scattering loss of the multiplexing optical element to the light, thereby improving the coupling efficiency of the device emission. Description of the Drawings

[0017] Figure 1 is an overall external schematic diagram of a narrowband single-fiber four-way combined optical device provided by the present invention;

[0018] Figure 2 is a schematic diagram of the internal structure of the cube in the embodiment of the present invention;

[0019] Figure 3 It is a schematic diagram of the cubic cover plate structure in the embodiment of the present utility model;

[0020] Figure 4 It is a schematic diagram of the internal structure of the optical emission end in the embodiment of the present utility model;

[0021] Figure 5 It is a schematic diagram of the internal structure of the optical receiving end in the embodiment of the present utility model;

[0022] Figure 6 It is a schematic diagram of the emission optical path in the embodiment of the present utility model;

[0023] Figure 7 It is a schematic diagram of the receiving optical path in the embodiment of the present utility model;

[0024] Figure 8 It is a schematic diagram of the internal optical path operation of the optical device in the embodiment of the present utility model. Detailed implementation manners

[0025] Next, in combination with the drawings provided by the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the drawings all adopt very simplified forms and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the purpose of the embodiments of the present utility model.

[0026] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connection" and "connection" shall be interpreted in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0027] In the description of the present utility model, the orientation or positional relationship terms such as "upper", "lower", "left", "right", "front", "rear", "center", "horizontal", "vertical", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0028] Embodiment:

[0029] Refer to Figures 1 to 5 As shown, this embodiment provides a narrowband single-fiber four-way multiplexing optical device. Refer to Figure 1As shown, the optical device includes a cube 2, and an optical port end 1, a laser end 3, and a detector end 4 mounted on the side of the cube 2; refer to Figure 2 As shown, the optical device further includes a micro-optical demultiplexing component 5, a dual-channel free-space optical isolator 6, and a C-lens 7 inside the cube 2. The laser end 3 of the optical device can emit two parallel band lights, which are combined into one path after being isolated by the dual-channel free-space optical isolator 6 and undergoing multiple reflections and refractions by the micro-optical demultiplexing component 5. The C-lens 7 converts the parallel light into converging light and then couples and converges it to the optical port end 1; the received band light input from the optical port end 1 is converted into parallel light by the C-lens 7, enters the micro-optical demultiplexing component 5, and is demultiplexed into two paths and incident on the detector end 4 after multiple reflections.

[0030] The implementation manner of the optical device will be specifically described below.

[0031] As a specific implementation manner of the cube 2, refer to Figure 1 As shown, the cube 2 is used to connect each port and can be a cube housing. Among them, the optical port end 1, the laser end 3, and the detector end 4 are respectively mounted on three sides, and the optical port end 1 and the laser end 3 are arranged opposite to each other; refer to Figure 2 As shown, the inside of the cube 2 further includes a micro-optical demultiplexing component 5, a dual-channel free-space optical isolator 6, and a C-lens 7. The dual-channel free-space optical isolator 6 is connected to the laser end 3, the C-lens 7 is connected to the optical port end 1, and the micro-optical demultiplexing component 5 is located between the dual-channel free-space optical isolator 6 and the C-lens 7. An opening is also provided on the top surface of the cube 2, and a cover plate is provided at the opening. Refer to Figure 3 As shown, it is the cover plate at the opening on the top surface of the cube 2.

[0032] As a specific implementation manner of the laser end 3, refer to Figure 4 As shown, the laser end 3 includes a laser end housing, and a first laser 8, a second laser 9, a first collimating lens 10, a second collimating lens 11, and a first mounting bracket 12 are arranged inside the laser end housing. The first mounting bracket 12 is used as a carrier for each relevant optical passive component inside the laser end 3. The first mounting bracket 12 is fixed inside the laser end 3 housing. The first laser 8 and the second laser 9 are respectively mounted in parallel on both sides of the first mounting bracket 12, and the first collimating lens 10 and the second collimating lens 11 are respectively mounted in front of the first laser 8 and the second laser 9. A flat window tube cap is sealed outside the port of the laser end 3. The above-mentioned first laser 8 and second laser 9 are mounted back-to-back and parallel through the first mounting bracket 12, and the divergent light of the laser is converted into collimated light through the collimating lens, which can reduce the lengths of the laser end 3 and the cube 2.

[0033] Refer to Figure 6As shown in (a), the divergent light emitted by the first laser 8 is converted into parallel light by the first collimating lens 10. After passing through the dual-channel free-space optical isolator 6, it enters the micro-optical demultiplexing component 5, and through multiple reflections and refractions by the filter and prism, it enters the C-lens 7. The C-lens 7 converts the parallel light into converging light, and the converging light converges to the optical port end 1; Refer to Figure 6 As shown in (b), the divergent light emitted by the second laser 9 is converted into parallel light by the second collimating lens 11. After passing through the dual-channel free-space optical isolator 6, it enters the micro-optical demultiplexing component 5, and through the deflection and refraction of the filter and prism, it enters the C-lens 7. The C-lens 7 converts the parallel light into converging light, and the converging light converges to the optical port end 1. The above is the propagation path of the emission optical path of this optical device, realizing the multiplexing of the light of two parallel bands of the first laser 8 and the second laser 9.

[0034] As a specific implementation manner of the detector end 4, refer to Figure 5 As shown, the detector end 4 includes a detector end housing. Inside the detector end housing, there are a converging lens 13, a first 0° filter 14, a second 0° filter 15, and a second mounting bracket 16. The second mounting bracket 16 is used as the mounting carrier for each optical passive component inside the detector end 4. The second mounting bracket 16 is fixed inside the detector end 4 housing. The converging lens 13 is installed above the second mounting bracket 16. The first 0° filter 14 and the second 0° filter 15 are arranged side by side on the side of the converging lens 13 facing the inside of the cube 2. The port of the detector end 4 is sealed with a flat window cap.

[0035] Refer to Figure 7 As shown, the received band light input from the optical port end 1 first passes through the C-lens 7, is converted from converging light to parallel light, and then enters the micro-optical demultiplexing component 5. After multiple reflections and refractions by the filter and prism, it is emitted from different output ports and divided into two paths. One path of the received light passes through the first 0° filter 14 and the converging glass lens 13, and is emitted from the detector end 14 to the photosensitive surface of the corresponding detector. The other path passes through the second 0° filter 15 and the converging glass lens 13, and is emitted from the detector end 14 to the photosensitive surface of the corresponding detector. One path of the received band light input from the optical port end 1 is demultiplexed into two paths with different bands, improving the coupling efficiency of the detector.

[0036] Optionally, the micro-optical demultiplexing component 5 uses an incident angle of 13.5° and a 13.5° + 36° optical path to separate the emission and reception two paths of light, preventing the light emitted by the laser from entering the detector, thereby reducing the optical crosstalk of the optical device.

[0037] Optionally, the micro-optical demultiplexing component 5, the dual-channel free-space optical isolator 6, and the C-lens 7 are bonded with a highly reliable epoxy resin glue to ensure the reliability while fixing the optical path.

[0038] Optionally, the total length of the optical device can be shortened to 25 mm, and the total width can be shortened to 9 mm.

[0039] Optionally, the output wavelength of the first laser 8 is 1490 nm, and the output wavelength of the second laser is 1577 nm.

[0040] Refer to Figure 8 As shown, it is a schematic diagram of the overall optical path working inside the above-mentioned narrowband single-fiber four-way combined optical device. The optical path at the detector end can be placed behind the optical path at the laser end. In this way, the emitted light of the second laser 9 only needs to pass through an isolator and a micro-optical demultiplexing component after being collimated by a lens to reach the optical port. The first laser 8 adds four reflections on this basis, and the entire emission optical path reduces the scattering loss of light by the demultiplexing optical passive components, thereby improving the coupling efficiency of the device emission.

[0041] Those skilled in the art of this technology should understand that the present utility model can be implemented in many other specific forms without departing from the spirit and scope of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

Claims

1. A narrowband single-fiber four-way multiplexing optical device, characterized in that: It includes a cube, an optical port end, a laser end, and a detector end mounted on the side of the cube, and also includes a micro-optical demultiplexing component, a dual-channel free-space optical isolator, and a C-lens inside the cube; Two lasers and two collimating lenses are fixedly installed at the laser end through a first mounting bracket, and a converging lens and two filter plates are fixedly installed at the detector end through a second mounting bracket.

2. The narrowband single-fiber four-way multiplexing optical device according to claim 1, wherein: The optical port end and the laser end are arranged opposite to each other. The dual-channel free-space optical isolator is connected to the laser end. The C-lens is connected to the optical port end. The micro-optical demultiplexing component is connected between the dual-channel free-space optical isolator and the C-lens.

3. The narrowband single-fiber four-way multiplexing optical device according to claim 2, characterized in that: The laser end includes a laser end housing and a first mounting bracket, a first laser, a second laser, a first collimating lens, and a second collimating lens inside the laser end housing. The first mounting bracket is fixed inside the laser end housing. The first laser and the second laser are installed in parallel on both sides of the first mounting bracket. The first collimating lens is installed at the front end of the first laser. The second collimating lens is installed at the front end of the second laser.

4. The narrowband single-fiber four-way multiplexing optical device according to claim 3, wherein: The detector end includes a detector end housing and a second mounting bracket, a converging lens, a first filter plate, and a second filter plate inside the detector end housing. The second mounting bracket is fixed inside the detector end housing. The converging lens is installed above the second mounting bracket. The first filter plate and the second filter plate are installed side by side on the side of the converging lens facing the inside of the cube.

5. The narrowband single-fiber four-way multiplexing optical device according to claim 4, characterized in that: The port of the laser end is sealed with a flat window cap, and the port of the detector end is sealed with a flat window cap.

6. The narrowband single-fiber four-way multiplexing optical device according to claim 4, characterized in that: Both the first filter plate and the second filter plate are 0° filter plates.

7. The narrowband single-fiber four-way multiplexing optical device according to any one of claims 1-6, characterized in that: The incident angle of the micro-optical demultiplexing component is 13.5°.

8. The narrowband single-fiber four-way multiplexing optical device according to claim 7, characterized in that: There is an opening on the top surface of the cube, and a cover plate is provided at the opening.

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