Single-fiber bidirectional five-port four-transmitting and one-receiving optical device

Abstract

The utility model discloses a single-fiber bidirectional five-port four-transmitting and one-receiving optical device, which comprises a transmitting end, a base and an adapter, the adapter is fixedly connected with one end of the base, the transmitting end is coupled at one end, far away from the adapter, of the base, the transmitting end comprises an airtight box tube shell, four backlight monitoring detectors and a wavelength division multiplexer, and the airtight box tube shell is connected with the adapter. The wavelength division multiplexer and the four backlight monitoring detectors are all located in the airtight box tube shell, one ends of the four backlight monitoring detectors are fixed to the inner wall of the airtight box tube shell, the other ends of the four backlight monitoring detectors are fixedly provided with lasers, one side of the airtight box tube shell is provided with a detector TO, a plurality of optical filters are further arranged in the airtight box tube shell, and the optical filters are connected with the airtight box tube shell. According to the utility model, the structure is reasonable, the BOX and coaxial assembly combination scheme is utilized, the total length of the optical device is shortened to 27.6 mm, the number of required flexible boards is reduced, and enough distribution forbidding space is reserved for PCB design.

Description

Technical Field

[0001] The utility model relates to the field of optical devices, and particularly relates to an optical device with a single-fiber bidirectional five-port four-transmission and one-reception structure. Background Art

[0002] In some customized projects, it is necessary to configure wavelength-tunable optical modules at each network node to implement a point-to-multipoint communication network, so as to improve the flexibility of network nodes and the utilization rate of system resources, and reduce the number of backup modules and network maintenance costs.

[0003] Currently, the optical devices used to meet such requirements adopt a coaxial component solution. However, the length dimension of the existing coaxial component solution is 28.5 mm, and a small-size TO needs to be customized. Moreover, the electrical connection in the existing solution is complex. Five flexible circuit boards need to be fabricated and welded for the five TO ports, and an electrical isolation design is also required, resulting in insufficient prohibited layout space on the PCB of the module and making it difficult to arrange the wiring. To address the above problems, a solution is proposed below. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an optical device with a single-fiber bidirectional five-port four-transmission and one-reception structure, which has the advantages of shortening the total length of the components, reducing the number of required flexible circuit boards, and leaving sufficient prohibited layout space for PCB design.

[0005] The above technical purpose of the utility model is achieved through the following technical solutions:

[0006] An optical device with a single-fiber bidirectional five-port four-transmission and one-reception structure includes a transmitting end, a base, and an adapter. The adapter is fixedly connected to one end of the base, and the transmitting end is coupled to the end of the base away from the adapter. The transmitting end includes an airtight box housing, four backlight monitoring detectors, and a wavelength division multiplexer. The wavelength division multiplexer and the four backlight monitoring detectors are both located inside the airtight box housing. One end of the four backlight monitoring detectors is fixed on the inner wall of the airtight box housing, and the four backlight monitoring detectors are arranged in the vertical direction. Lasers are fixedly provided at the other ends of the four backlight monitoring detectors, and the four lasers respectively correspond to the four receiving ends of the wavelength division multiplexer. A detector TO is provided on one side of the airtight box housing, and a plurality of optical filters are also provided inside the airtight box housing. The plurality of optical filters are used to adjust the path of light.

[0007] Preferably, several of the filters include Filter 1, Filter 2, and Filter 3. Filter 1 is fixed at one end of the inner cavity of the base away from the detector TO, and Filter 1 is inclined at 32°. Filter 2 is disposed on one side of the inner cavity of the base coupled to the transmitting end, and Filter 2 is inclined at 13°. Filter 3 is disposed on one side of the inner cavity of the base coupled to the detector TO, and Filter 3 is horizontally arranged.

[0008] Preferably, a transmitting collimating lens is further provided in the airtight box housing, and the transmitting collimating lens is located between the laser and the wavelength division multiplexer.

[0009] Preferably, an isolator is provided at the coupling portion between the transmitting end and the base, and the isolator is located between Filter 2 and the transmitting end.

[0010] Preferably, a receiving collimating lens is provided at the coupling portion between the detector TO and the base, and the receiving collimating lens is located between Filter 3 and the detector TO.

[0011] Preferably, the adapter is an optical fiber adapter, and a converging lens is provided at the connection portion between the adapter and the base.

[0012] Preferably, a sealing cushion block is provided on the base, and the sealing cushion block is located on the side of Filter 1 away from the detector TO.

[0013] The beneficial effects of the present utility model are as follows:

[0014] Compared with the existing coaxial solution that requires assembling a 4-channel transmitting TO component, this solution encapsulates 4-channel "emitting lasers" in an "airtight box housing". It has at least the following advantages:

[0015] 1. The length can be shortened by at least 1 mm, and all conventional materials are used, without the need to customize small-sized TOs, providing a larger prohibited layout space for the module while maintaining low cost;

[0016] 2. Simplify the electrical connection with the PCB circuit board. Compared with the coaxial component solution where 5 TO ports each require designing and manufacturing 5 kinds of flexible circuit boards, this solution only needs to manufacture two kinds of flexible circuit boards, namely 4-channel transmitting and one-channel receiving; and since the "airtight box housing" of the transmitting part itself has an electrical isolation design, the "optical fiber adapter" does not need to be electrically isolated anymore;

[0017] 3. Compared with the complex coupling process of the existing coaxial component solution, the optical path of this solution is more concise, the coupling process has a large tolerance and low difficulty. This solution separately configures a "transmitting collimating lens" for each "laser", ensuring that each transmitted light can be separately coupled with a large coupling tolerance; at the same time, the process of the "wavelength division multiplexer" is mature, ensuring the accuracy of multiplexing. Description of the Drawings

[0018] Figure 1 Schematic structural diagram of the embodiment;

[0019] Figure 2 Cross-sectional structural diagram of the embodiment;

[0020] Figure 3 Wire bonding connection diagram inside the airtight box housing of the embodiment;

[0021] Figure 4 External pin definition diagram of the ceramic part of the airtight box housing of the embodiment.

[0022] Reference numerals in the drawings: 1. Adapter; 2. Converging lens; 3. Detector TO; 4. Base; 5. Receiving collimating lens; 6. Sealing gasket; 7. Filter 1; 8. Filter 2; 9. Filter 3; 10. Isolator; 11. Airtight box housing; 12. Wavelength division multiplexer; 13. Transmitting collimating lens; 14. Laser; 15. Backlight monitoring detector. Detailed implementation manners

[0023] The following description is only the preferred implementation manner of the present invention, and the protection scope is not limited to this embodiment. All technical solutions falling within the concept of the present invention shall belong to the protection scope of the present invention. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "bottom" and "top", "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0024] As Figures 1 to 4 shown, an optical device with single-fiber bidirectional five ports and four transmitters and one receiver includes a transmitting end, a base 4 and an adapter 1. The adapter 1 is fixedly connected to one end of the base 4, the transmitting end is coupled to the end of the base 4 away from the adapter 1, and a detector TO3 is coupled to the lower side of the base 4. When transmitting an optical signal, the optical signal is emitted from the transmitting end, passes through the inner cavity of the base 4, and finally exits from the end of the adapter 1; when receiving an optical signal, the external optical signal enters the inner cavity of the base 4 from the end of the adapter 1 and is finally transmitted to the detector TO3.

[0025] The transmitting end includes an airtight box housing 11, four backlight monitoring detectors 15, and a wavelength division multiplexer 12. The four backlight monitoring detectors 15 are evenly arranged in the vertical direction, and one end of each of the four backlight monitoring detectors 15 is wire-bonded to the pins on the inner wall of the airtight box housing 11. A laser 14 is provided at the end of the backlight monitoring detector 15 away from the inner wall of the airtight box housing 11, and the laser 14 can emit optical signals. The wavelength division multiplexer 12 is fixed inside the airtight box housing 11 and is located on one side of the laser 14. The signal emitted by the laser 14 can enter the wavelength division multiplexer 12. The wavelength division multiplexer 12 in this design is a four-in-one wavelength division multiplexer 12, and the four receiving ends of the wavelength division multiplexer 12 correspond to the positions of the four lasers 14 respectively. The four optical rays emitted by the four lasers 14 are combined into one optical ray after entering the wavelength division multiplexer 12.

[0026] An emission collimating lens 13 is also provided inside the airtight box housing 11. The emission collimating lens 13 is located between the laser 14 and the wavelength division multiplexer 12. The light rays emitted by the laser 14 are first collimated by the emission collimating lens 13 and then enter the wavelength division multiplexer 12 for combination. An isolator 10 is provided at the coupling part of the transmitting end and the base 4. The light emitted from the wavelength division multiplexer 12 first penetrates the isolator 10 and then enters the base 4.

[0027] The adapter 1 is an optical fiber adapter 1, and a converging lens 2 is provided at the connection part of the adapter 1 and the base 4. The light rays entering the adapter 1 from the outside will be converged by the converging lens 2, so that the light rays change from a divergent state to a beam state, which is convenient for subsequent reception.

[0028] A receiving collimating lens 5 is provided at the coupling part of the detector TO3 and the base 4. When receiving external optical signals, the external light rays enter the base 4, are reflected inside the base 4, and then shoot towards the detector TO3. The light rays will first pass through the receiving collimating lens 5 and be adjusted by the receiving collimating lens 5 before finally being emitted into the detector TO3.

[0029] Several optical filters are also provided inside the airtight box housing 11, and the several optical filters are used to adjust the path of the light rays. The several optical filters include an optical filter one 7, an optical filter two 8, and an optical filter three 9. The optical filter one 7 is fixed at one end of the inner cavity of the base 4 away from the detector TO3, the optical filter two 8 is arranged on one side of the inner cavity of the base 4 coupled with the transmitting end, and the optical filter three 9 is arranged on one side of the inner cavity of the base 4 coupled with the detector TO3.

[0030] When explaining the angles of several filters, a rectangular coordinate system with the lowest point of the filter as the origin is used. Filter 1-7 is inclined at 32°. Here, 32° refers to the angle between Filter 1-7 and the negative X-axis; Filter 2-8 is inclined at 13°. Here, 13° refers to the angle between Filter 2-8 and the positive Y-axis; Filter 3-9 is horizontally arranged, that is, parallel to the X-axis.

[0031] A sealing pad 6 is provided on the base 4. The sealing pad 6 is located on the side of Filter 1-7 away from the detector TO3. The sealing pad 6 can prevent external light from irradiating into the base 4, keeping the inner cavity of the base 4 in a dark environment.

[0032] The ceramic parts of the airtight box housing 11 in this solution have a special pin definition design to meet the special requirements of the product. Its special design lies in: in order to simplify the electrical connection, four emission ports and four backlight monitoring ports are concentrated and connected by a single flexible circuit board. The external pin definitions of the four-channel differential AC signal and the four-channel monitored DC signal of this product are defined on the same layer. Since the signal speed of this product is not high, being 10 Gbps, and the four emission ports do not work simultaneously, there is no signal interference. Therefore, the special pin design of this product is feasible.

[0033] When the transmitting end works, the four lasers 14 emit optical signals with wavelengths of 1271 nm / 1291 nm / 1311 nm / 1331 nm in sequence. First, they are collimated by the transmitting collimating lens 13 and shaped into parallel light, and then synthesized into one path of light by a four-in-one wavelength division multiplexer 12. The parallel light first passes through the isolator 10, and then passes through Filter 2-8, whose transmission spectrum is 1264~1337.5 nm; finally, it enters a converging lens 2, which focuses the parallel light and couples it into the ferrule of the fiber optic adapter 1.

[0034] When the receiving end works, the wavelengths of the externally input light are 1351 / 1371 / 1391 / 1411 nm. After being transformed into parallel light by the converging lens 2 through the fiber optic adapter 1, it is reflected by Filter 2-8 and Filter 1-7 in sequence. The cut-off spectrum of Filter 1-7 is 1260~1420 nm; then it is transmitted through Filter 3-9, whose transmission spectrum is 1344.5~1417.5 nm; finally, it is converged onto the detector through the receiving collimating lens 5.

[0035] The specific embodiments described above further elaborate on the technical problems solved, technical solutions, and beneficial effects of the present utility model. It should be understood that the above are only specific embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A single-fiber bidirectional five-port four-transmit and one-receive optical device, comprising a transmitting end, a base (4) and an adapter (1), characterized in that: The adapter (1) is fixedly connected to one end of the base (4), and the transmitting end is coupled to one end of the base (4) away from the adapter (1). The transmitting end comprises an airtight box tube shell (11), four backlight monitoring detectors (15) and a wavelength division multiplexer (12). The wavelength division multiplexer (12) and the four backlight monitoring detectors (15) are all located in the airtight box tube shell (11). One end of the four backlight monitoring detectors (15) is fixed on the inner wall of the airtight box tube shell (11), and the four backlight monitoring detectors are arranged in a vertical direction. The other end of the four backlight monitoring detectors (15) is fixedly provided with a laser (14), and the four lasers (14) respectively correspond to the four receiving ends of the wavelength division multiplexer (12). A detector TO (3) is provided on one side of the airtight box tube shell (11), and a plurality of filters are also provided inside the airtight box tube shell (11). The plurality of filters are used to adjust the path of light.

2. The single-fiber bidirectional five-port four-transmit and one-receive optical device according to claim 1, characterized in that: The plurality of optical filters include an optical filter 1 (7), an optical filter 2 (8) and an optical filter 3 (9), wherein the optical filter 1 (7) is fixed to an end of the inner cavity of the base (4) away from the detector TO (3), and the optical filter 1 (7) is inclined at 32°, the optical filter 2 (8) is arranged on a side where the inner cavity of the base (4) is coupled to the emission end, the optical filter 2 (8) is inclined at 13°, the optical filter 3 (9) is arranged on a side where the inner cavity of the base (4) is coupled to the detector TO (3), and the optical filter 3 (9) is arranged horizontally.

3. The single-fiber bidirectional five-port four-transmit and one-receive optical device according to claim 1, characterized in that: An emission collimating lens (13) is also provided in the airtight box tube shell (11), and the emission collimating lens (13) is located between the laser (14) and the wavelength division multiplexer (12).

4. The single-fiber bidirectional five-port four-transmit and one-receive optical device according to claim 2, characterized in that: An isolator (10) is provided at the coupling point between the emission end and the base (4), and the isolator (10) is located between the second filter (8) and the emission end.

5. The single-fiber bidirectional five-port four-transmit and one-receive optical device according to claim 2, characterized in that: A receiving collimating lens (5) is provided at the coupling point between the detector TO (3) and the base (4), and the receiving collimating lens (5) is located between the filter three (9) and the detector TO (3).

6. The single-fiber bidirectional five-port four-transmit and one-receive optical device according to claim 1, characterized in that: The adapter (1) is a fiber optic adapter (1), and a converging lens (2) is provided at the connection between the adapter (1) and the base (4).

7. The single-fiber bidirectional five-port four-transmit and one-receive optical device according to claim 2, characterized in that: A sealing gasket (6) is provided on the base (4), and the sealing gasket (6) is located on a side of the filter 1 (7) away from the detector TO (3).

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