A high-speed transceiver module for 5G mid-haul transmission

Abstract

The present invention proposes a high-speed transceiver module for 5G mid-transmission, the transceiver module comprising a receiving optical path for receiving signals and a transmitting optical path for sending signals; the receiving optical path and the transmitting optical path share the transceiver port of the transceiver module; a collimator is arranged inside the transceiver port to collimate the light entering the transceiver port into parallel light; the transmitting end of the transceiver module is provided with a laser chip for sending signals, and the receiving end is provided with an optoelectronic receiving chip for receiving signals, the optical signal sent by the laser chip is first converted into parallel light by the lens part at the beginning of the transmitting optical path, and then reaches the transceiver port through the transmitting optical path for emission; the optical signal received by the transceiver port is collimated into parallel light and then reaches the optoelectronic receiving chip through the receiving optical path; the present invention can use a small-angle filter to realize the effective separation or synthesis of signals with narrow wavelength intervals, and obtain the effective combination and demultiplexing of two optical signals with narrow wavelength intervals through a shorter optical path, while obtaining a higher coupling efficiency.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber communication technology, and in particular to a high-speed transceiver module for 5G mid-transmission. Background Art

[0002] With the increasing popularity of fiber optic networks, especially the rapid implementation of 5G networks and point-to-point data transmission, especially the large-scale deployment of 5G mid-haul and front-haul nodes, the market demand for single-fiber bidirectional components with narrow wavelength intervals is also increasing.

[0003] In the current 5G network, the fronthaul network is the transmission between AAU (active antenna processing unit) and DU (distribution unit), and the midhaul network is the transmission between DU (distribution unit) and CU (centralized unit). The midhaul network processes a large amount of information, requires high speed, and uses 50G bidirectional. In addition, it is a long-distance transmission, so a wavelength near zero dispersion is used. The smaller the dispersion, the better, so the wavelength interval is narrow. The wavelength of LAN WDM is used for high-speed, long-distance, and low-dispersion transmission. It has a mature industrial foundation for application. Therefore, the standard wavelength of LAN WDM is used in the 5G midhaul network. The wavelengths of 1295.56nm and 1309.14nm are used as the wavelengths of the transmitter and receiver respectively, with a wavelength interval of 13.58nm, which is a narrow wavelength interval. If the wavelength bandwidth of 1.3nm is deducted, the actual wavelength interval is 12.28nm.

[0004] Currently, single-fiber bidirectional components on the market use two wavelength optical signals with a wide wavelength interval. For example, FTTH (fiber to the home) uses 1310nm and 1490nm wavelength signals with a wavelength interval of more than 100nm.

[0005] In the traditional dual-wavelength single-fiber bidirectional optical transceiver module component structure, the wavelengths of the transmitting and receiving ends need to be wide enough, otherwise the transmitted wavelength signal or the reflected wavelength signal cannot be effectively separated. Summary of the invention

[0006] The present invention proposes a high-speed transceiver module for 5G mid-transmission, which can use a small-angle filter to effectively separate or synthesize signals with narrow wavelength intervals, and obtain effective combination and demultiplexing of two optical signals with narrow wavelength intervals through a shorter optical path, while obtaining a higher coupling efficiency.

[0007] The present invention adopts the following technical solutions.

[0008] A high-speed transceiver module for 5G mid-transmission, the transceiver module comprising a receiving optical path for receiving signals and a transmitting optical path for sending signals; the receiving optical path and the transmitting optical path share a transceiver port (1) of the transceiver module; a collimator is arranged inside the transceiver port to collimate light entering the transceiver port into parallel light; a transmitting end (2) of the transceiver module is provided with a laser chip (21) for sending signals, and a receiving end (3) is provided with a photoelectric receiving chip (31) for receiving signals; the optical signal sent by the laser chip (21) is first converted into parallel light by a lens portion (5) at the beginning of the transmitting optical path, and then reaches the transceiver port for emission via the transmitting optical path; the optical signal received by the transceiver port is collimated into parallel light and then reaches the photoelectric receiving chip via the receiving optical path.

[0009] When the receiving port and the transceiver port of the photoelectric receiving chip (31) are located on the same straight line, in the receiving optical path, after the incident light is collimated into parallel light A by the transceiver port (1), the parallel light A is first transmitted through the first filter (41) and then incident on the positive lens (32) in front of the photoelectric receiving chip (31), and then converged by the positive lens (32) into an optical signal incident on the receiving port of the photoelectric receiving chip (31);

[0010] In this structure, in the emission optical path, the laser light emitted by the laser chip (21) is first converted into parallel light B by the lens portion (5), and then emitted to the first reflector (42) through the free space isolator (6); the parallel light B is first reflected by the first reflector (42) to the first filter (41), and then reflected by the first filter (41) to the transceiver port for emission.

[0011] When the receiving port and the transmitting and receiving port of the photoelectric receiving chip (31) are located on the same straight line, the first optical filter (41) is a small-angle optical filter capable of separating or synthesizing two optical signals with a narrow wavelength interval.

[0012] A second reflector (44) may be additionally provided at the output end of the free space isolator (6), wherein the second reflector (44) reflects the parallel light B to adjust the emission direction of the parallel light B.

[0013] When the optical signal transmitting end of the laser chip (21) and the transceiver port are located on the same straight line, in the transmitting optical path, the laser light emitted by the laser chip (21) is first converted into parallel light B by the lens portion (5), then emitted to the first optical filter (41) by the free space isolator (6), and then transmitted through the first optical filter (41) to reach the transceiver port for emission;

[0014] In this structure, in the receiving optical path, after the incident light is collimated into parallel light A by the transceiver port (1), the parallel light A first passes through the first filter (41) to the first reflector (42), is then reflected by the first reflector (42) to the second filter (43), is transmitted through the second filter (43) to the positive lens (32) in front of the photoelectric receiving chip (31), and is then converged by the positive lens (32) to form an optical signal incident on the receiving port of the photoelectric receiving chip (31).

[0015] When the optical signal transmitting end and the transmitting and receiving port of the laser chip (21) are located on the same straight line, the first optical filter (41) is a small-angle optical filter capable of separating or synthesizing two optical signals with a narrow wavelength interval; and the second optical filter (43) is a 0-degree optical filter.

[0016] The lens portion (5) is a lens group or a single aspherical lens. When the lens portion is a lens group, the laser light emitted by the laser chip (21) is first converted into convergent light by a convex lens (22), and the convergent light is then converted into parallel light B by a negative lens (7).

[0017] The laser chip at the transmitting end of the transceiver module includes a laser diode, and the photoelectric receiving chip at the receiving end includes a photodiode.

[0018] The laser diode may be a laser diode with a cooling package, and the photodiode may be an avalanche photodiode.

[0019] The present invention uses a small-angle filter to effectively separate or synthesize signals with narrow wavelength intervals, and can obtain effective combination and demultiplexing of two optical signals with narrow wavelength intervals through a shorter optical path, while obtaining higher coupling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0021] Attached Figure 1 This is a schematic diagram when the receiving port and the transmitting and receiving port of the optoelectronic receiving chip are located on the same straight line;

[0022] Attached Figure 2 It is a schematic diagram when the receiving port and the transmitting and receiving port of the optoelectronic receiving chip are located on the same straight line and a second reflector is added to the free space isolator;

[0023] Attached Figure 3 This is a schematic diagram of the laser chip when the optical signal transmitting end and the transmitting and receiving port are located on the same straight line;

[0024] Attached Figure 4 is a schematic diagram when the lens portion is a lens group;

[0025] In the figure: 1-transceiver port; 2-transmitter; 3-receiver; 5-lens part; 6-free space isolator; 7-negative lens; 21-laser chip; 22-convex lens; 31-photoelectric receiving chip; 32-positive lens; 41-first filter; 42-first reflector; 43-second filter; 44-second reflector. DETAILED DESCRIPTION

[0026] like Figure 1-4 As shown, a high-speed transceiver module for 5G mid-transmission, the transceiver module includes a receiving optical path for receiving signals and a transmitting optical path for sending signals; the receiving optical path and the transmitting optical path share the transceiver port 1 of the transceiver module; a collimator is arranged inside the transceiver port to collimate the light entering the transceiver port into parallel light; the transmitting end 2 of the transceiver module is provided with a laser chip 21 for sending signals, and the receiving end 3 is provided with an optoelectronic receiving chip 31 for receiving signals. The optical signal sent by the laser chip 21 is first converted into parallel light by the lens part 5 at the beginning of the transmitting optical path, and then reaches the transceiver port through the transmitting optical path for emission; the optical signal received by the transceiver port is collimated into parallel light and then reaches the optoelectronic receiving chip through the receiving optical path.

[0027] When the receiving port and the transceiver port of the photoelectric receiving chip 31 are located on the same straight line, in the receiving optical path, after the incident light is collimated into parallel light A by the transceiver port 1, the parallel light A is first transmitted through the first filter 41 and then incident on the positive lens 32 in front of the photoelectric receiving chip 31, and then converged by the positive lens 32 into an optical signal incident on the receiving port of the photoelectric receiving chip 31;

[0028] Under this structure, in the emission light path, the laser emitted by the laser chip 21 is first converted into parallel light B by the lens portion 5, and then emitted to the first reflector 42 through the free space isolator 6. The parallel light B is first reflected by the first reflector 42 to the first filter 41, and then reflected by the first filter 41 to the transceiver port for emission.

[0029] When the receiving port and the transmitting and receiving port of the optoelectronic receiving chip 31 are located on the same straight line, the first optical filter 41 is a small-angle optical filter that can separate or synthesize two optical signals with a narrow wavelength interval.

[0030] A second reflector 44 may be provided at the output end of the free space isolator 6 , and the second reflector 44 reflects the parallel light B to adjust the emission direction of the parallel light B.

[0031] When the optical signal transmitting end of the laser chip 21 and the transceiver port are located on the same straight line, in the transmitting optical path, the laser emitted by the laser chip 21 is first converted into parallel light B by the lens portion 5, then emitted to the first filter 41 by the free space isolator 6, and then transmitted by the first filter 41 to reach the transceiver port for emission;

[0032] Under this structure, in the receiving optical path, after the incident light is collimated into parallel light A by the transceiver port 1, the parallel light A first passes through the first filter 41 to the first reflector 42, is then reflected by the first reflector 42 to the second filter 43, is transmitted through the second filter 43 to the positive lens 32 in front of the optoelectronic receiving chip 31, and is then converged by the positive lens 32 to be an optical signal incident on the receiving port of the optoelectronic receiving chip 31.

[0033] When the optical signal transmitting end and the receiving and transmitting port of the laser chip 21 are located on the same straight line, the first filter 41 is a small-angle filter that can separate or synthesize two optical signals with a narrow wavelength interval; the second filter 43 is a 0-degree filter.

[0034] The lens portion 5 is a lens group or a single aspherical lens. When the lens portion is a lens group, the laser emitted by the laser chip 21 is first converted into convergent light by the convex lens 22, and the convergent light is then converted into parallel light B by the negative lens 7.

[0035] The laser chip at the transmitting end of the transceiver module includes a laser diode, and the photoelectric receiving chip at the receiving end includes a photodiode.

[0036] The laser diode may be a laser diode with a cooling package, and the photodiode may be an avalanche photodiode.

[0037] In this example, if Figure 1 As shown, when the receiving port and the transceiver port of the optoelectronic receiving chip 31 are located on the same straight line, the transmitting end is on the side and the receiving end is directly behind the input and output ends. In this structure, the isolation of the receiving end is sufficient to meet the requirements, and there is no need to add a 0-degree filter to increase the isolation. This structure is simple and easy to debug.

[0038] In this example, if Figure 2 As shown, the receiving port and the transceiver port of the optoelectronic receiving chip 31 are located on the same straight line, and when the transmitting end and the receiving end are both directly behind the input and output ends, the overall space of this structure is larger, and the receiving end does not need to add a 0-degree filter to increase isolation.

[0039] In this example, if Figure 3 As shown, when the optical signal transmitting end of the laser chip 21 is located on the same straight line as the transceiver port, the transmitting end is directly behind the input and output ends, and the receiving end is on the side. In order to increase the isolation of the receiving end in this structure, a 0-degree filter needs to be added in front of the receiving end. This structure is completely compatible with the existing optical transceiver module in appearance, and the package shape requirements remain unchanged.

Claims

1. A high-speed transceiver module for 5G mid-transmission, characterized in that: The transceiver module comprises a receiving optical path for receiving signals and a transmitting optical path for sending signals; the receiving optical path and the transmitting optical path share a transceiver port (1) of the transceiver module; a collimator is provided in the transceiver port to collimate the light entering the transceiver port into parallel light; the transmitting end (2) of the transceiver module is provided with a laser chip (21) for sending signals, and the receiving end (3) is provided with a photoelectric receiving chip (31) for receiving signals; the optical signal sent by the laser chip (21) is first converted into parallel light by a lens portion (5) at the beginning of the transmitting optical path, and then reaches the transceiver port through the transmitting optical path for emission; the optical signal received by the transceiver port is collimated into parallel light and then reaches the photoelectric receiving chip through the receiving optical path; When the receiving port and the transceiver port of the photoelectric receiving chip (31) are located on the same straight line, in the receiving optical path, after the incident light is collimated into parallel light A by the transceiver port (1), the parallel light A is first transmitted through the first filter (41) and then incident on the positive lens (32) in front of the photoelectric receiving chip (31), and then converged by the positive lens (32) into an optical signal incident on the receiving port of the photoelectric receiving chip (31); In this structure, in the emission optical path, the laser light emitted by the laser chip (21) is first converted into parallel light B by the lens portion (5), and then emitted to the first reflector (42) through the free space isolator (6); the parallel light B is first reflected by the first reflector (42) to the first filter (41), and then reflected by the first filter (41) to the transceiver port for emission; The laser chip at the transmitting end of the transceiver module includes a laser diode, and the photoelectric receiving chip at the receiving end includes a photodiode.

2. A high-speed transceiver module for 5G mid-transmission according to claim 1, characterized in that: When the receiving port and the transmitting and receiving port of the photoelectric receiving chip (31) are located on the same straight line, the first optical filter (41) is a small-angle optical filter capable of separating or synthesizing two optical signals with a narrow wavelength interval.

3. A high-speed transceiver module for 5G mid-transmission according to claim 1, characterized in that: A second reflector (44) is additionally provided at the output end of the free space isolator (6), and the second reflector (44) reflects the parallel light B to adjust the emission direction of the parallel light B.

4. A high-speed transceiver module for 5G mid-transmission according to claim 1, characterized in that: When the optical signal transmitting end of the laser chip (21) and the transceiver port are located on the same straight line, in the transmitting optical path, the laser light emitted by the laser chip (21) is first converted into parallel light B by the lens portion (5), then emitted to the first optical filter (41) by the free space isolator (6), and then transmitted through the first optical filter (41) to reach the transceiver port for emission; In this structure, in the receiving optical path, after the incident light is collimated into parallel light A by the transceiver port (1), the parallel light A first passes through the first filter (41) to the first reflector (42), is then reflected by the first reflector (42) to the second filter (43), is transmitted through the second filter (43) to the positive lens (32) in front of the photoelectric receiving chip (31), and is then converged by the positive lens (32) to form an optical signal incident on the receiving port of the photoelectric receiving chip (31).

5. A high-speed transceiver module for 5G mid-transmission according to claim 4, characterized in that: When the optical signal transmitting end and the transmitting and receiving port of the laser chip (21) are located on the same straight line, the first optical filter (41) is a small-angle optical filter capable of separating or synthesizing two optical signals with a narrow wavelength interval; and the second optical filter (43) is a 0-degree optical filter.

6. A high-speed transceiver module for 5G mid-transmission according to claim 1, characterized in that: The lens portion (5) is a lens group or a single aspherical lens. When the lens portion is a lens group, the laser light emitted by the laser chip (21) is first converted into convergent light by a convex lens (22), and the convergent light is then converted into parallel light B by a negative lens (7).

7. A high-speed transceiver module for 5G mid-transmission according to claim 1, characterized in that: The laser diode is a laser diode with a cooling package, and the photodiode is an avalanche photodiode.

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