Low-crosstalk long-distance same-wavelength transceiving integrated single-fiber bidirectional device

Abstract

The utility model discloses a low-crosstalk long-distance same-wavelength transmit-receive integrated single-fiber bidirectional device comprising a pedestal, one side of the pedestal is provided with a laser adjusting ring and a tube body, the tube body is internally provided with a laser diode, one end of the laser diode is provided with a first focusing lens, and the other side of the pedestal is provided with an optical fiber adapter and an adapter adjusting ring. A circulator is arranged in the base, a first collimating lens is installed at one end of the optical fiber adapter, a second collimating lens is arranged in the base, a detection assembly is arranged at the upper end of the base and comprises a detector, a fixing pipe is arranged at the upper end of the base, the detector is installed at the upper end of the fixing pipe, and a second focusing lens is arranged at the lower end of the fixing pipe. The circulator is provided with a first port, a second port and a third port, the first port is matched with the laser diode, the second port is matched with the optical fiber adapter, and the third port is matched with the detector, and the optical fiber transceiver is reasonable in structure and has the advantages of low optical loss, short transmission distance and small optical crosstalk.

Description

Technical Field

[0001] The utility model relates to the technical field of laser communication, and particularly relates to a single-fiber bidirectional device with low crosstalk and long distance for co-wavelength transceiver integration. Background Art

[0002] At present, the development of optical communication technology is changing with each passing day. The era of optical communication 5G communication is coming soon, the Internet of Things will develop rapidly, and fiber optic communication technology will become more and more important and will also receive unprecedented development. Fiber optic communication has always been the main means of information transmission. Fiber optic communication has developed greatly in China. The development of fiber optic communication is inseparable from the development of communication equipment, fiber optic cables, optical modules, and optical devices. So far in the development of communication, optical devices of optical modules and sub-optical modules, as the core of the optoelectronic optical module conversion technology in communication, are also the core of the module cost, and the cost proportion accounts for more than 70%.

[0003] The patent application number CN201410235259.4 discloses a single-fiber bidirectional device with low crosstalk and co-wavelength wavelength division multiplexing for transceiver integration, and the patent application number CN201922170713.3 discloses an optical device for BOSA with co-wavelength transceiver integration applied to OTDR ranging. The co-wavelength single-fiber bidirectional devices in the above two applications both adopt the scheme of "45-degree filter + absorption sheet", and the 45-degree filter adopts a proportional transmission and reflection film, with transmission and reflection ratios of 3:7 / 4:6 / 5:5, etc. The optical power loss of transmission and reception is too large (>3dB), which reduces the transceiver performance and transmission distance of the product. At the same time, adopting the scheme of "45-degree filter + absorption sheet" cannot completely solve the problem of optical crosstalk of co-wavelength transceiver. The transmission and reflection ratio of the filter makes it extremely difficult to balance the performance of transmission or reception. In view of the above problems, a solution is proposed below. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a single-fiber bidirectional device with low crosstalk and long distance for co-wavelength transceiver integration, which has the advantages of low optical loss, long transmission distance, and small optical crosstalk.

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

[0006] A low-crosstalk long-distance single-fiber bidirectional transceiver device with the same wavelength, comprising a base. One side of the base is provided with a laser adjustment ring and a tube body, and the tube body is installed at one end of the base through the laser adjustment ring. A laser diode is installed inside the tube body. One end of the laser diode is provided with a first focusing lens. The other side of the base is provided with an optical fiber adapter and an adapter adjustment ring, and the optical fiber adapter is installed at the other end of the base through the adapter adjustment ring. The laser diode and the optical fiber adapter are both communicated with the inner cavity. A circulator is arranged inside the base. One end of the optical fiber adapter is installed with a first collimating lens, and the first collimating lens is located on one side of the circulator. A second collimating lens is arranged inside the base, and the second collimating lens is located between the circulator and the laser diode. A detection component is arranged at the upper end of the base.

[0007] Preferably, the detection component includes a detector. A fixed tube is arranged at the upper end of the base, and the fixed tube is fixed to the upper end of the base through heat-curing glue. The detector is installed at the upper end of the fixed tube, and a second focusing lens is arranged at the lower end of the fixed tube.

[0008] Preferably, the circulator is provided with a first port, a second port and a third port. The first port is adapted to the laser diode, the second port is adapted to the optical fiber adapter, and the third port is adapted to the detector.

[0009] Preferably, both the circulator and the second collimating lens are connected to the base by adhesive curing.

[0010] The beneficial effects of the present utility model are as follows: Utilizing the working principle of the optical circulator to replace the 45° filter for beam splitting (transmitting and reflecting in proportion), effectively solving the problems of large insertion loss and large crosstalk, greatly improving the optical power and sensitivity, significantly reducing the optical loss, with the wavelength-division loss of the same wavelength being less than 1 dB and the transmission distance being long, and the transmission distance can reach more than 100 km. Greatly reducing the optical crosstalk, making the optical crosstalk < -40 dB. Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of the embodiment;

[0012] Figure 2 It is a sectional view of the embodiment;

[0013] Figure 3 It is a partial structural sectional view of the embodiment.

[0014] Reference numerals: 1, base; 2, laser adjustment ring; 3, tube body; 4, laser diode; 5, first focusing lens; 6, fiber optic adapter; 7, adapter adjustment ring; 8, circulator; 9, first collimating lens; 10, second collimating lens; 11, detection assembly; 12, detector; 13, fixed tube; 14, second focusing lens; 15, first port; 16, second port; 17, third port. Detailed implementation mode

[0015] The following is only the preferred implementation mode of the present invention, and the protection scope is not limited to this embodiment. All technical solutions within the idea of the present invention shall fall within 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" refer to the directions towards or away from the geometric center of a specific component respectively.

[0016] As Figures 1 to 3 shown, a low-crosstalk long-distance single-fiber bidirectional device with the same wavelength for transceiver integration includes a base 1. A circulator 8 is arranged in the base 1, and a second collimating lens 10 is arranged in the base 1. The staff can install the circulator 8 and the second collimating lens 10 into the base 1 successively, and both the circulator 8 and the second collimating lens 10 are fixed in the base 1 by means of adhesive curing. On the other side of the base 1, there are a fiber optic adapter 6 and an adapter adjustment ring 7, and the fiber optic adapter 6 is installed at the other end of the base 1 through the adapter adjustment ring 7. Then, the fiber optic adapter 6 can be installed into the adapter adjustment ring 7, and then the adapter adjustment ring 7 and the base 1 can be sleeved and fixed between the adapter adjustment ring 7 and the base 1 by welding, so as to realize the connection between the fiber optic adapter 6 and the base 1.

[0017] On one side of the base 1, there are a laser adjustment ring 2 and a tube body 3, and the tube body 3 is installed at one end of the base 1 through the adjustment laser ring. A laser diode 4 is installed in the tube body 3. Then, the laser diode 4 can be welded in the tube body 3, and then the tube body 3 can be installed into the adjustment laser ring, and the adjustment laser ring and the base 1 are fixed by means of coupling welding. Thus, the connection between the laser diode 4 and the base 1 is realized.

[0018] On the upper end of the base 1, there is a detection assembly 11. The detection assembly 11 includes a detector 12. On the upper end of the base 1, there is a fixed tube 13, and the fixed tube 13 is fixed on the upper end of the base 1 by heat-curing glue. The detector 12 is installed on the upper end of the fixed tube 13. By installing the detector 12 on the upper end of the fixed tube 13, and then the fixed tube 13 can be fixed on the base 1 by means of glue heat-curing, so as to realize the connection between the detector 12 and the base 1.

[0019] One end of the laser diode 4 is provided with a first focusing lens 5. The laser diode 4 and the fiber optic adapter 6 are both connected to the inner cavity. One end of the fiber optic adapter 6 is installed with a first collimating lens 9, and the first collimating lens 9 is located on one side of the circulator 8, and the second collimating lens 10 is located between the circulator 8 and the laser diode 4. The lower end of the fixed tube 13 is provided with a second focusing lens 14. The circulator 8 is provided with a first port 15, a second port 16 and a third port 17. The first port 15 is adapted to the laser diode 4, the second port 16 is adapted to the fiber optic adapter 6, and the third port 17 is adapted to the detector 12.

[0020] The working principle of the present utility model:

[0021] Working of the transmitting end: The light emitted by the laser diode 4 passes through the first focusing lens 5 and becomes converging light and is emitted, and then is converted into collimated light by the second collimating lens 10 and enters the first port 15 of the circulator 8. After passing through the internal optical path of the circulator 8, it is output from the second port 16, and then passes through the first collimating lens 9 and is output from the fiber optic adapter 6.

[0022] Working of the receiving end: The externally input light passes through the fiber optic adapter 6 and the second collimating lens 10 and is converted into parallel light, and then enters the second port 16 of the circulator 8. After passing through the internal optical path of the circulator 8, it is output from the third port 17, and then the light can be converged onto the detector 12 through the second focusing lens 14.

[0023] Utilizing the working principle of the optical circulator 8 to replace the 45° filter for beam splitting (transmitting and reflecting according to a ratio). Effectively solve the problems of large insertion loss and large crosstalk, greatly improve the optical power and sensitivity, significantly reduce the optical loss, and the wavelength division loss of the same wavelength is less than 1 dB. The transmission distance is long, and the transmission distance can reach more than 100 km. Significantly reduce the optical crosstalk, making the optical crosstalk < -40 dB.

[0024] For the specific embodiments described above, the technical problems solved, the technical solutions and the beneficial effects of the present utility model are further described in detail. 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 principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A low crosstalk, long-distance, same-wavelength, transceiver, single-fiber, bidirectional device, characterized in that: The invention comprises a base (1), wherein a laser adjustment ring (2) and a tube body (3) are arranged on one side of the base (1), and the tube body (3) is installed on one end of the base (1) by adjusting the laser ring, a laser diode (4) is installed in the tube body (3), and a first focusing lens (5) is arranged on one end of the laser diode (4), and an optical fiber adapter (6) and an adapter adjustment ring (7) are arranged on the other side of the base (1), and the optical fiber adapter (6) is installed on the base (1) by the adapter adjustment ring (7). At the other end, the laser diode (4) and the optical fiber adapter (6) are both connected to the inner cavity, a circulator (8) is arranged in the base (1), a first collimating lens (9) is installed at one end of the optical fiber adapter (6), and the first collimating lens (9) is located on one side of the circulator (8), a second collimating lens (10) is arranged in the base (1), and the second collimating lens (10) is located between the circulator (8) and the laser diode (4), and a detection component (11) is arranged at the upper end of the base (1).

2. According to claim 1, a low crosstalk, long-distance, same-wavelength, transceiver-integrated single-fiber bidirectional device, characterized in that: The detection assembly (11) comprises a detector (12); a fixing tube (13) is arranged at the upper end of the base (1), and the fixing tube (13) is fixed to the upper end of the base (1) by means of a heat-curing adhesive; the detector (12) is mounted on the upper end of the fixing tube (13); and a second focusing lens (14) is arranged at the lower end of the fixing tube (13).

3. According to claim 2, a low crosstalk, long-distance, same-wavelength, transceiver-integrated single-fiber bidirectional device, characterized in that: The circulator (8) is provided with a first port (15), a second port (16) and a third port (17); the first port (15) is adapted to the laser diode (4), the second port (16) is adapted to the optical fiber adapter (6), and the third port (17) is adapted to the detector (12).

4. According to claim 3, a low crosstalk, long-distance, same-wavelength, transceiver integrated single-fiber bidirectional device, characterized in that: The circulator (8) and the second collimating lens (10) are both connected to the base (1) by adhesive curing.

Images