Three-mode coexisting airtight BOX device

Abstract

The utility model relates to a three-mode coexisting airtight BOX device. The three-mode coexisting airtight BOX device comprises an adapter with a built-in lens I, a receiving end optical path assembly and a transmitting end optical path assembly, wherein the receiving end optical path assembly and the transmitting end optical path assembly are arranged in parallel; the receiving end light path assembly comprises a filter plate, a wave separator and a plurality of receiving ends, an input light path is shaped into parallel light through a lens I, the parallel light is transmitted from the filter plate and enters the wave separator, and the light path separated by the wave separator enters the receiving ends; the transmitting end light path assembly comprises a plurality of transmitting ends, a combiner and a displacement prism, a plurality of light paths emitted by the transmitting ends enter the combiner, the combined light paths are emitted to a filter after being changed in direction through the displacement prism, and the light paths enter a first lens to be converged after being reflected by the filter so as to enter an optical fiber; the utility model has the advantages that the space in height is utilized while the bandwidth is met, so that the whole device is more miniaturized and can be packaged in an SFP-DD small module, and the efficiency of an optical system and the efficiency of a product manufacturing process are improved.

Description

Technical Field

[0001] The utility model relates to the field of optical device manufacturing, in particular to an airtight BOX device with coexistence of three modes. Background Art

[0002] With the development of the access network and the continuous improvement of network speed, the development of passive optical network (PON) is also constantly upgraded. At present, 10G PON has entered the large-scale deployment stage, and the 50G PON standard, as the only standard for the next generation of PON after 10G PON, can provide more than 5 times the access bandwidth and better service support capabilities (large bandwidth, low latency, high reliability) compared with 10G PON, and supports smooth evolution from GPON, 10G PON to 50G PON to be as compatible as possible with the existing ODN network.

[0003] The existing triple-network compatible optical modules (GPON OLT + XG(S)PON OLT + 50G PON OLT) include the following wavelengths: downstream wavelengths: 1342nm, 1577nm, 1490nm; upstream wavelengths: 1286nm, 1270nm, 1310nm. To implement the six-way coaxial optical path scheme inside the device, the existing solution shown in Patent 202311715483.9 is adopted, using multiple discrete filters to achieve the transmission and reflection of the optical path, but this solution has the following defects:

[0004] 1. The excessive number of internal components in the device results in a relatively large device size, making it impossible to fit into the structural components of the SFP-DD protocol;

[0005] 2. Multiple discrete filters make the assembly process more cumbersome;

[0006] 3. Using filters for multi-angle and multi-time reflection and wave division, the system efficiency is low, generally about 50%.

[0007] Based on this, this case is proposed. Content of the Utility Model

[0008] The purpose of the utility model is to provide an airtight BOX device with coexistence of three modes, which not only miniaturizes and simplifies the manufacturing process, but also improves the efficiency of the optical system.

[0009] To achieve the above purpose, the technical solution of the utility model is as follows:

[0010] An airtight BOX device with coexistence of three modes includes an adapter with an internal lens 1, and also includes a receiving-end optical path component and a transmitting-end optical path component arranged in parallel;

[0011] The receiving optical path component includes a filter, a demultiplexer, and a number of receivers. After the optical path input from the optical fiber is shaped into parallel light by a first lens, it passes through the filter and enters the demultiplexer. The demultiplexer demultiplexes the optical path, and the demultiplexed optical paths correspond one-to-one with the receivers. The demultiplexed optical paths enter the receivers.

[0012] The transmitting optical path component includes a number of transmitters, a multiplexer, and a displacement prism. The optical paths emitted by the number of transmitters enter the multiplexer for multiplexing. After the multiplexed optical path is changed in direction by the displacement prism, it is directed towards the filter, reflected by the filter, and then enters the first lens for focusing, and thus enters the optical fiber.

[0013] Further, a number of filters corresponding one-to-one with the receivers are provided between the demultiplexer and the receivers. The optical paths demultiplexed by the demultiplexer enter the receivers after being filtered by the filters.

[0014] Further, the receiver includes a second lens, a reflection prism, and a photoelectric conversion unit. After the second lens converts the optical path demultiplexed by the demultiplexer into converging light, it is reflected by the reflection prism and enters the photoelectric conversion unit.

[0015] Further, the second lens is an array lens with a converging spot smaller than 15 microns.

[0016] Further, the transmitter includes a light-emitting unit and a third lens. The light-emitting unit is used to emit an optical path, and the emitted optical path is shaped into parallel light by the third lens and then enters the multiplexer.

[0017] Further, an isolator is provided between the multiplexer and the displacement prism. The multiplexed optical path enters the displacement prism after passing through the isolator.

[0018] Further, it includes a box body and a cover plate. The first lens of the receiving optical path component, the transmitting optical path component, and the adapter are arranged in the box body. After the box body and the cover plate are closed, a sealed environment is formed, and the sealed environment is filled with inert gas.

[0019] The advantages of the present utility model are as follows:

[0020] 1. The filter is used to separate the light at the receiving end and the transmitting end by wavelength, forming a receiving optical path component and a transmitting optical path component arranged in parallel. While meeting the bandwidth requirements, the space in height is utilized, making the overall device more miniaturized and capable of being encapsulated in an SFP-DD small module; only four couplings are required to complete the optical path shaping of the three-mode 50GPON product, which is a significant improvement compared to the traditional six couplings in the 6TO scheme and seven couplings in the 3TO + 1BOX scheme, improving the efficiency of the optical system and the product manufacturing process.

[0021] 2. Optimize the optical path design structurally, select an array lens with a converging spot smaller than 15 microns and an active coupling method to solve the problem of low sensitivity of 50G APD;

[0022] 3. Adopt BOX hermetic packaging. Compared with the existing non-hermetic solutions, it has better reliability and can better meet the index requirements of the industrial temperature standard. Description of the Drawings

[0023] Figure 1 It is a schematic plan view of the product in the embodiment;

[0024] Figure 2 It is a schematic 3D view of the product in the embodiment;

[0025] Figure 3 It is a schematic simple optical path view of the product in the embodiment;

[0026] Figure 4 It is Figure 3 the enlarged schematic view of part A in

[0027] Figure 5 It is a schematic side optical path view of the transmitting end and the receiving end of the product in the embodiment;

[0028] Figure 6 It is a schematic transmitting-end optical path view of the product in the embodiment;

[0029] Figure 7 It is a schematic receiving-end optical path view of the product in the embodiment;

[0030] Label Description

[0031] 1. Box body; 2. Cover plate; 3. Fiber optic adapter; 301. Lens 1; 4. Transmitting-end optical path component; 401. Displacement prism; 402. Isolator; 403. Combiner; 404. Lens 3; 405. Laser; 5. Receiving-end optical path component; 501. Filter; 502. Demultiplexer; 503. Filter; 504. Lens 2; 505. Reflection prism; 506. Photoelectric conversion unit. Detailed Embodiment

[0032] The following further describes the present invention in detail with reference to the embodiments. It should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. in the text are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, 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 should not be construed as a limitation to the present utility model.

[0033] This embodiment proposes a hermetic BOX device with three-mode coexistence, such asFigure 1 and Figure 2 As shown in Figure 2 , the BOX device includes a box body 1 and a cover plate 2 for sealing the box body 1. A fiber optic adapter 3 is installed at the front end of the box body 1, and a PCBA board is connected to the rear end. Inside the box body 1, there is a first lens 301, and a receiving optical path component 5 and a transmitting optical path component 4 arranged side by side vertically. Among them, the first lens 301 is placed at the end of the fiber optic adapter 3. The first lens 301 is a collimator C-LENS, which is used to shape the divergent light input by the optical fiber into a parallel beam, or to focus the parallel light output by the transmitting optical path component 4 into the optical fiber.

[0034] As Figures 3 to 7 shown in Figures 3 to 7 , the receiving optical path component 5 includes a filter 501, a demultiplexer 502, and three receiving ends. The filter can transmit light with wavelengths of 1310mm, 1286nm, and 1270nm, and reflect light with wavelengths of 1577nm, 1490nm, and 1342nm. Figure 3 In Figure 3 , λ1-λ3 are the emission wavelengths, which are 1577nm, 1490nm, and 1342nm respectively, and λ4-λ6 are the receiving wavelengths, which are 1310mm, 1286nm, and 1270nm respectively. The optical path input from the optical fiber (i.e., λ4-λ6) is shaped into a parallel beam by the first lens 301, and then transmitted through the filter 501 into the demultiplexer 502. The demultiplexer 502 demultiplexes the optical path. The demultiplexer 502 demultiplexes the optical path into three optical paths, and the three optical paths respectively enter the three receiving ends. Preferably, a plurality of filters filter 503 corresponding to the receiving ends one by one are provided between the demultiplexer 502 and the receiving ends. The optical paths demultiplexed by the demultiplexer 502 enter the receiving ends after being filtered by the filters 503. The filter 503 is used to selectively pass or block light within a specific wavelength range.

[0035] As Figure 4 and Figure 7 shown in Figure 4 and Figure 7 , the receiving end includes a second lens 504, a reflecting prism 505 arranged at 42.5°, and a photoelectric conversion unit 506. The second lens 504 converts the optical path output by the filter 503 into a converging light, and then reflects it into the photoelectric conversion unit 506 through the reflecting prism 505. Preferably, the second lens 504 is an array lens with a converging spot smaller than 15 microns, and the effective converging spot is 14 microns, which is much smaller than the photosensitive surfaces of the three photoelectric conversion units 506 with different rates, thus bringing considerable sensitivity data. The three photoelectric conversion units 506 in this embodiment respectively adopt a 1.25G receiving chipset, a 25G / 50G receiving chipset, and a 10G receiving chipset.

[0036] The transmitting optical path component 4 includes three transmitting ends, a multiplexer 403, and a displacement prism 401. The three optical paths (i.e., λ1 - λ3) emitted by the three transmitting ends enter the multiplexer 403 for multiplexing. The multiplexed optical path is directed by the displacement prism 401 and then shoots towards the filter 501. After being reflected by the filter 501, it enters the first lens 301 for focusing and then enters the optical fiber. The displacement prism 401, also known as a translation prism or a rhomboid prism, is an optical element mainly used to change the direction of the optical path.

[0037] As Figure 4 and Figure 6 shown, the transmitting end includes a light-emitting unit and a third lens 404. The light-emitting unit is used to emit an optical path. The emitted optical path is shaped into parallel light by the third lens 404 and then enters the multiplexer 403. The three light-emitting units in this embodiment use two EML COCs with SOAs and one DFB COC, and the laser 405 emits laser light of the corresponding wavelength. Preferably, an isolator 402 is provided between the multiplexer 403 and the displacement prism 401. The multiplexed optical path enters the displacement prism 401 after passing through the isolator 402. The function of the isolator 402 is to ensure that the optical signal can only propagate in one direction and prevent the backward-transmitted light from affecting the performance of the light source or the optical communication system.

[0038] The filter 501 is used to separate the light at the receiving end and the transmitting end by wavelength, forming a receiving optical path component and a transmitting optical path component arranged in parallel. While meeting the bandwidth requirements, the space in height is utilized, making the overall device more miniaturized and capable of being packaged in an SFP-DD small module.

[0039] The first lens 301 of the receiving optical path component 5, the transmitting optical path component 4, and the adapter are arranged in the box body 1. After the box body 1 and the cover plate 2 are closed, a sealed environment is formed. At the same time, an inert gas is filled in the sealed environment to form a BOX package, which has higher performance, higher reliability, and better economic effects compared with the existing solutions on the market (six-way BOSA devices and BOX + BOSA devices).

[0040] The above embodiments are only used to explain the concept of the present invention, rather than limiting the protection scope of the rights of the present invention. Any non-substantive modification made to the present invention using this concept shall fall within the protection scope of the present invention.

Claims

1. A three-mode coexisting airtight BOX device, comprising an adapter with a built-in lens, characterized in that: It also includes a receiving end optical path component and a transmitting end optical path component arranged in parallel; The receiving end optical path component includes a filter, a wave splitter, and a plurality of receiving ends. The optical path input from the optical fiber is transformed into parallel light by a lens, and then transmitted from the filter into the wave splitter. The wave splitter splits the optical path, and the optical paths split by the wave splitter correspond to the receiving ends one by one. The optical paths split by the wave splitter enter the receiving ends. The transmitting optical path component includes a plurality of transmitting ends, a combiner and a displacement prism. The plurality of optical paths emitted by the plurality of transmitting ends enter the combiner for combining. The combined optical paths are directed to the filter after being changed in direction by the displacement prism, and are reflected by the filter before entering the lens 1 for convergence, thereby entering the optical fiber.

2. A three-mode coexistence airtight BOX device as claimed in claim 1, characterized in that: A plurality of filters corresponding to the receiving ends are arranged between the wave splitter and the receiving end, and the light path split by the wave splitter enters the receiving end after being filtered by the filter.

3. A three-mode coexistence airtight BOX device as claimed in claim 1, characterized in that: The receiving end comprises a second lens, a reflecting prism and a photoelectric conversion unit. The second lens converts the light path split by the splitter into converged light, which is then reflected by the reflecting prism into the photoelectric conversion unit.

4. A three-mode coexistence airtight BOX device as claimed in claim 3, characterized in that: The second lens is an array lens with a convergent light spot smaller than 15 microns.

5. The three-mode coexistence airtight BOX device according to claim 1, characterized in that: The transmitting end includes a light emitting unit and a lens three. The light emitting unit is used for transmitting a light path. The transmitted light path is shaped into parallel light by the lens three and then enters the combiner.

6. A three-mode coexistence airtight BOX device as claimed in claim 1, characterized in that: An isolator is arranged between the combiner and the displacement prism, and the combined light path passes through the isolator and then enters the displacement prism.

7. A three-mode coexistence airtight BOX device as claimed in claim 1, characterized in that: It comprises a box body and a cover plate. The receiving end optical path component, the emitting end optical path component and the lens of the adapter are arranged in the box body. The box body and the cover plate are closed to form a closed environment, and the closed environment is filled with inert gas.

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