A high-speed transceiver module for 5G fronthaul and a control method thereof

Abstract

The application relates to a 5G front transmission high-speed transceiver module and a control method thereof, which comprises a transmitting end, a receiving end, an input / output end and an optical kernel component; optical signals output by the input / output end are received by the receiving end after passing through the optical kernel component; and optical signals emitted by the transmitting end are received by the input / output end after passing through the optical kernel component. The application avoids interference between adjacent wavelengths with ultra-narrow intervals, realizes high isolation and high return loss of adjacent wavelengths with ultra-narrow intervals, and enables the realization of a high-speed transceiver module with a 7nm interval and a 2nm transition band in a front transmission module in a 5G sub-item standard.

Description

Technical Field

[0001] This invention relates to the field of optical fiber communication technology, specifically to a high-speed transceiver module for 5G fronthaul and its control method. Background Technology

[0002] With the increasing prevalence of fiber optic networks, especially the rapid implementation of 5G networks and point-to-point data transmission, particularly the large-scale deployment of 5G midhaul and fronthaul nodes, the market demand for adjacent wavelength single-fiber bidirectional components is growing.

[0003] To meet the current demands of the popular 5G fronthaul network, the 5G fronthaul solution deploys only one optical fiber from the base station to the equipment room. The base station equipment can use either 6 or 12 wavelengths, and then selects the appropriate number of wavelengths based on the needs of business operations. Both the base station and the equipment room need to use multiplexing and demultiplexing modules to multiplex light of different wavelengths from the optical modules into a single optical fiber, and to demultiplex light of different wavelengths from the optical fiber to various optical modules. The typical application of the currently proposed 5G fronthaul solution is a 6-wavelength CWDM scheme, with wavelengths spaced 20nm apart, namely 1271nm, 1291nm, 1311nm, 1331nm, 1351nm, and 1371nm.

[0004] The fronthaul includes both standalone 5G networks and hybrid networks with 4G. In hybrid networks, a single base station actually carries both 4G and 5G signals. A 4G base station requires 6 wavelengths, and 5G also requires 6 wavelengths. For easier base station compatibility in the future, hybrid 4G and 5G networks require 12 wavelengths. The proposed innovative Open-WDM / MWDM solution, based on the existing six-channel CWDM 20nm channel wavelength spacing, adjusts the wavelength offset by 3.5nm up and down. Each channel transmits two wavelength signals, CW-3.5nm and CW+3.5nm, forming a 12-wavelength multiplexing module with non-equidistant wavelength spacing, such as... Figure 1 The 12 wavelengths shown.

[0005] Currently, single-fiber bidirectional modules on the market consist of two optical signals with a wide wavelength gap.

[0006] The principle of the simplest single-fiber bidirectional optical transceiver module component, such as... Figure 2As shown, the optical signal enters the optical assembly through the common end 1 via an optical fiber. In the optical assembly, the first filter 11 is at a 45-degree angle to the optical path. The light beam undergoes a 90-degree reflection after passing through the first filter 11, and then is filtered by the second filter 12 before being received by the receiver 3. The receiver 3 uses a PD photodiode as a photodetector for photoelectric conversion, transforming the optical signal into an electrical signal. The transmitter 2 uses a laser diode, and the light beam from the transmitter 2 is transmitted through the first filter 11 into the common end 1.

[0007] The principle of traditional dual-wavelength single-fiber bidirectional optical transceiver modules is as follows: Figure 3 As shown, other principles and descriptions are the same. Figure 2 To increase signal stability and reduce various interferences during transmission, an optical isolator 13 (consisting of a magnetic ring, two polarizers, and a magneto-optical plate) is placed at the front end of the transmitter 2 to prevent line interference from being reflected back to the laser diode.

[0008] In the traditional structure, because the first filter 11 must be incident at 45° to achieve transmission and reflection of different wavelengths, the wavelengths of the transmitting and receiving ends must be wide enough to meet the application requirements; otherwise, the transmitted or reflected wavelength signals will not be effectively separated. Summary of the Invention

[0009] In view of this, the purpose of this invention is to provide a high-speed transceiver module for 5G fronthaul and its control method, which avoids interference between adjacent wavelengths with ultra-narrow spacing and achieves high isolation and high return loss between adjacent wavelengths with ultra-narrow spacing.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A high-speed transceiver module for 5G fronthaul includes a transmitter, a receiver, an input / output terminal, and an optical core component; the optical signal output from the input / output terminal is received by the receiver after passing through the optical core component; the optical signal emitted by the transmitter is received by the input / output terminal after passing through the optical core component.

[0012] Furthermore, the optical core assembly includes a first polarizing beam splitter, a second polarizing beam splitter, a 0° narrowband filter, a magnetorheological plate, a 22.5° 1 / 2 wave plate, and a magnetic plate.

[0013] Furthermore, the second polarizing beam splitter is a trapezoid with right-angled sides.

[0014] Furthermore, the second polarizing beam splitter is a parallelogram.

[0015] Furthermore, the input and output terminals are located at the polarization beam-splitting surface of the second polarization beam-splitting prism.

[0016] Furthermore, the input and output terminals are located on the reflecting surface of the second polarizing beam splitter.

[0017] Furthermore, a 0° narrowband filter is provided between the receiver and the optical core assembly.

[0018] Furthermore, the transmitting end employs a combination of a flat-window laser diode and an aspherical lens, or a combination of a negative lens and a converging laser diode.

[0019] A control method for a high-speed transceiver module for 5G fronthaul, wherein the transmitting end emits a single-polarized light beam, which is split into a vertically polarized beam and a parallel-polarized beam; the divergent light signal emitted by the transmitting end is converted into a parallel-polarized light signal after passing through a positive lens; the vertically polarized beam emitted by the transmitting end is reflected by the polarization splitting surface of a first polarizing beam splitter and reaches the reflecting surface of the first polarizing beam splitter, and after reflection by the reflecting surface, reaches a 22.5° 1 / 2 waveplate, and after passing through the 22.5° 1 / 2 waveplate and a magnetorheological plate, it becomes a parallel-polarized beam. After a parallel-direction polarized beam reaches the second polarizing beam splitter, it is transmitted through the polarization splitting surface of the second polarizing beam splitter and then received by the input / output terminal. The parallel-direction polarized beam is transmitted through the polarization splitting surface 4 of the first polarizing beam splitter and then reaches the 22.5° 1 / 2 waveplate. After passing through the 22.5° 1 / 2 waveplate and the magneto-optic plate, it becomes a vertically polarized beam. The vertically polarized beam reaches the second polarizing beam splitter and is reflected by the reflecting surface of the second polarizing beam splitter. It then reaches the polarization splitting surface of the second polarizing beam splitter and is reflected by the polarization splitting surface and received by the input / output terminal.

[0020] The input from the input / output terminals is an arbitrary polarization beam. The parallel-polarized beam is transmitted through the polarization splitting surface of the second polarization beam splitter and reaches the magneto-optical plate. After passing through the magneto-optical plate and the 22.5° 1 / 2 waveplate, the parallel-polarized beam reaches the first polarization beam splitter. After being reflected by the reflecting surface of the first polarization beam splitter, it reaches the polarization splitting surface of the first polarization beam splitter and is transmitted through the polarization splitting surface before being received by the receiving end. The perpendicular-polarized beam is reflected by the polarization splitting surface of the second polarization beam splitter and reaches the reflecting surface of the second polarization beam splitter. After being reflected by the reflecting surface, it reaches the magneto-optical plate. After passing through the magneto-optical plate and the 22.5° 1 / 2 waveplate, the perpendicular-polarized beam reaches the first polarization beam splitter and is reflected by the polarization splitting surface of the first polarization beam splitter before being received by the receiving end.

[0021] A control method for a high-speed transceiver module for 5G fronthaul, wherein the transmitting end emits a single-polarized light beam, which is split into a vertically polarized beam and a parallel-polarized beam; the divergent light signal emitted by the transmitting end is converted into a parallel light signal after passing through a positive lens; the vertically polarized beam emitted by the transmitting end is reflected by the polarization splitting surface of a first polarization beam splitter and reaches the reflecting surface of the first polarization beam splitter, and after reflection by the reflecting surface, reaches a 22.5° 1 / 2 waveplate, and after passing through the 22.5° 1 / 2 waveplate and a magneto-optical plate, it is still a vertically polarized beam; the vertically polarized beam reaches a second polarization beam splitter and is then... The beam is reflected from the polarization splitting surface of the first polarization splitting prism and then to the reflecting surface of the second polarization splitting prism. After being reflected by the reflecting surface, it is received by the input / output terminal. The parallel polarized beam is transmitted through the polarization splitting surface of the first polarization splitting prism and then to the 22.5° 1 / 2 waveplate. After passing through the 22.5° 1 / 2 waveplate and the magneto-optical plate, it is still a parallel polarized beam. After reaching the second polarization splitting prism, it is reflected by the reflecting surface of the second polarization splitting prism and then to the polarization splitting surface 421 of the second polarization splitting prism. After being transmitted through the polarization splitting surface, it reaches the reflecting surface of the second polarization splitting prism and is received by the input / output terminal after being reflected by the reflecting surface.

[0022] The input from the input / output terminals is an arbitrary polarization beam. The parallel-polarized beam is reflected by the reflecting surface of the second polarizing beam splitter and reaches its polarization splitting surface. After transmission through the polarization splitting surface, it reaches the reflecting surface of the second polarizing beam splitter, is reflected again, and reaches the magneto-optical plate. After passing through the magneto-optical plate and a 22.5° 1 / 2 waveplate, it becomes a vertically polarized beam. This vertically polarized beam reaches the first polarizing beam splitter, is reflected by its polarization splitting surface, and is received by the receiving end. The vertically polarized beam is reflected by the reflecting surface of the second polarizing beam splitter and reaches its polarization splitting surface. After reflection by the polarization splitting surface, it reaches the magneto-optical plate, passes through the magneto-optical plate and a 22.5° 1 / 2 waveplate, becomes a parallel-polarized beam, reaches the first polarizing beam splitter, is reflected by its reflecting surface, reaches its polarization splitting surface, is transmitted through the polarization splitting surface, and is received by the receiving end.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] This invention uses an optical core assembly composed of optical elements such as a polarizing beam splitter prism, a magneto-optical plate, and a waveplate, and employs collimated light in the optical path to effectively separate adjacent wavelengths with ultra-narrow spacing. A 0° narrowband filter is placed at the receiving end to avoid interference between adjacent wavelengths with ultra-narrow spacing, achieving high isolation and high return loss between adjacent wavelengths with ultra-narrow spacing. This enables the high-speed transceiver module with a 7nm spacing and 2nm transition band in the fronthaul module of the 5G sub-standard to be realized. Attached Figure Description

[0025] Figure 1 List of 12 wavelengths required for current 4G and 5G hybrid networking.

[0026] Figure 2 A schematic diagram of the optical principle of the simplest single-fiber bidirectional dual-wavelength optical transceiver module.

[0027] Figure 3 A schematic diagram of the optical principle of a traditional single-fiber bidirectional dual-wavelength optical transceiver module.

[0028] Figure 4 This is a schematic diagram of the optical principle of a high-speed transceiver module for 5G fronthaul according to Embodiment 1 of the present invention.

[0029] Figure 5 This is a schematic diagram of the optical principle of a high-speed transceiver module for 5G fronthaul according to Embodiment 2 of the present invention.

[0030] Figure 6 This is a schematic diagram of the optical principle of a high-speed transceiver module for 5G fronthaul according to Embodiment 3 of the present invention.

[0031] Figure 7 This is a schematic diagram of another optical principle for parallel light output at the transmitter in one embodiment of the present invention.

[0032] In the diagram: Input / output terminal -1, transmitter -2, laser chip of transmitter 2 -21, positive lens -22.

[0033] Receiver-3, photoelectric receiving chip of receiver-31, positive lens-32, first polarizing beam splitter-41, second polarizing beam splitter-42, 0° narrowband filter-5, 22.5° 1 / 2 wave plate-6, magnetoresistive plate-7, negative lens-8. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0035] This invention provides a high-speed transceiver module for 5G fronthaul, including an input / output terminal 1, a transmitter 2, a laser chip 21 and a positive lens 22 of the transmitter 2, a receiver 3, an optoelectronic receiver chip 31 and a positive lens 32 of the receiver 3, and an optical core assembly. The optical core assembly includes a first polarizing beam splitter 41, a second polarizing beam splitter 42, a 0° narrowband filter 5, a 22.5° half-wave plate 6, and a magnetorheological plate 7.

[0036] Example 1, please refer to Figure 4 This embodiment includes an input / output terminal 1, a transmitter 2, a laser chip 21 and a positive lens 22 at the transmitter 2, a receiver 3, a photoelectric receiving chip 31 and a positive lens 32 at the receiver 3, and an optical core assembly. The optical core assembly includes a first polarizing beam splitter 41, a second polarizing beam splitter 42, a 0° narrowband filter 5, a 22.5° 1 / 2 waveplate 6, and a magneto-optical rotator 7. The optical core assembly is attached and fixed to a magnetic sheet. The transmitter 2 emits a single-polarized beam, which is split into a vertically polarized beam and a parallel-polarized beam. The divergent beam signal emitted by the laser chip 21 at the transmitter 2 is converted into a parallel beam signal after passing through the positive lens 22. The vertically polarized beam emitted from transmitter 2 is reflected by the polarization splitting surface 411 of the first polarizing beam splitter 41 and reaches the reflecting surface 412 of the first polarizing beam splitter 41. After being reflected by the reflecting surface 412, it reaches the 22.5° 1 / 2 wave plate 6. After passing through the 22.5° 1 / 2 wave plate 6 and the magneto-optical plate 7, it becomes a parallel polarized beam. The parallel polarized beam reaches the second polarizing beam splitter 42 and is transmitted through the polarization splitting surface 421 of the second polarizing beam splitter 42 before being connected to the input / output terminal 1. The parallel-polarized beam is transmitted through the polarization splitting surface 411 of the first polarization beam splitter 41 and reaches the 22.5° 1 / 2 wave plate 6. After passing through the 22.5° 1 / 2 wave plate 6 and the magneto-optical plate 7, it becomes a vertically polarized beam. The vertically polarized beam reaches the second polarization beam splitter 42 and is reflected by the reflecting surface 422 of the second polarization beam splitter 42. It then reaches the polarization splitting surface 421 of the second polarization beam splitter 42 and is received by the input / output 1 after being reflected by the polarization splitting surface 421.

[0037] The input from input / output terminal 1 is an arbitrary polarization beam. The parallel-polarized beam is transmitted through the polarization splitting surface 421 of the second polarization beam splitter 42 and reaches the magneto-optical rotator 7. After passing through the magneto-optical rotator 7 and the 22.5° 1 / 2 waveplate 6, the parallel-polarized beam reaches the first polarization beam splitter 41. After being reflected by the reflecting surface 412 of the first polarization beam splitter 41, it reaches the polarization splitting surface 411 of the first polarization beam splitter 41. After being transmitted through the polarization splitting surface 411, it is received... The photodetector 3 receives the vertically polarized beam, which is reflected by the polarization splitting surface 421 of the second polarization beam splitter 42 and then reaches the reflecting surface 422 of the second polarization beam splitter 42. After being reflected by the reflecting surface 422, it reaches the magneto-optical rotator 7. After passing through the magneto-optical rotator 7 and the 22.5° 1 / 2 wave plate 6, the vertically polarized beam reaches the first polarization beam splitter 41. After being reflected by the polarization splitting surface 411 of the first polarization beam splitter 41, it is received by the photodetector 3.

[0038] Example 2, please refer to Figure 5 The optical path principle in this embodiment is the same as in Embodiment 1, except that the shape of the second polarizing beam splitter 42 is slightly different from that in Embodiment 1. The second polarizing beam splitter 42 in Embodiment 1 is a trapezoid with right-angled sides, while the second polarizing beam splitter 42 in Embodiment 2 is a parallelogram.

[0039] Example 3, Reference Figure 6 In this embodiment, the second polarizing beam splitter 42 has the same shape as in Embodiment 2, which is a parallelogram. In this embodiment, input / output terminal 1 is located at the reflecting surface 423 of the second polarizing beam splitter 42, such as... Figure 6 As shown; however, in embodiments one and two, input / output terminal 1 is input / output at the polarization beam-splitting surface 421 of the second polarization beam-splitting prism 42, as shown. Figure 4 and Figure 5 As shown. The magnetic field direction of the magnetic sheet in Example 3 is different from that in Examples 1 and 2. Because the magnetic field direction is different, the polarization state rotation direction of the light beam by the magnetic optical rotator 7 is also different.

[0040] In this embodiment, the transmitter 2 emits a single-polarized beam, which is split into a vertically polarized beam and a parallel-polarized beam. The divergent beam signal emitted by the laser chip 21 of the transmitter 2 is converted into a parallel beam signal after passing through the positive lens 22. The vertically polarized beam emitted by the transmitter 2 is reflected by the polarization splitting surface 411 of the first polarization beam splitter 41 and reaches the reflecting surface 412 of the first polarization beam splitter 41. After being reflected by the reflecting surface 412, it reaches the 22.5° 1 / 2 waveplate 6. After passing through the 22.5° 1 / 2 waveplate 6 and the magneto-optical plate 7, it is still a vertically polarized beam. The vertically polarized beam reaches the second polarization beam splitter 42 and is reflected by the polarization splitting surface 421 of the second polarization beam splitter 42 and reaches the reflecting surface 423 of the second polarization beam splitter 42. After being reflected by the reflecting surface 423, it is connected to the input / output terminal 1. The parallel-polarized beam is transmitted through the polarization splitting surface 411 of the first polarization beam splitter 41 and reaches the 22.5° 1 / 2 wave plate 6. After passing through the 22.5° 1 / 2 wave plate 6 and the magneto-optical plate 7, it is still a parallel-polarized beam. The parallel-polarized beam reaches the second polarization beam splitter 42 and is reflected by the reflecting surface 422 of the second polarization beam splitter 42 and reaches the polarization splitting surface 421 of the second polarization beam splitter 42. After being transmitted through the polarization splitting surface 421, it reaches the reflecting surface 423 of the second polarization beam splitter 42 and is received by the input / output 1 after being reflected by the reflecting surface 423.

[0041] The input from input / output terminal 1 is an arbitrary polarization beam. The parallel-polarized beam is reflected by the reflecting surface 423 of the second polarizing beam splitter 42 and reaches the polarization splitting surface 421 of the second polarizing beam splitter 42. After transmission through the polarization splitting surface 421, it reaches the reflecting surface 422 of the second polarizing beam splitter 42. After reflection by the reflecting surface 422, it reaches the magneto-optical rotator 7. After passing through the magneto-optical rotator 7 and the 22.5° 1 / 2 waveplate 6, it becomes a vertically polarized beam. The vertically polarized beam reaches the first polarizing beam splitter 41. After reflection by the polarization splitting surface 411 of the first polarizing beam splitter 41, it is received by the receiving end. The photodetector 3 receives the vertically polarized beam, which is reflected by the reflecting surface 423 of the second polarizing beam splitter 42 and reaches the polarizing beam splitting surface 421 of the second polarizing beam splitter 42. After being reflected by the polarizing beam splitting surface 421, it reaches the magneto-optical rotator 7. After passing through the magneto-optical rotator 7 and the 22.5° 1 / 2 waveplate 6, it becomes a parallel polarized beam. The parallel polarized beam reaches the first polarizing beam splitter 41, is reflected by the reflecting surface 412 of the first polarizing beam splitter 41, and reaches the polarizing beam splitting surface 411 of the first polarizing beam splitter 41. After being transmitted through the polarizing beam splitting surface 411, it is received by the photodetector 3 at the receiving end.

[0042] Please refer to Figure 7This is a schematic diagram of another optical principle for parallel light output from the transmitter in this embodiment of the invention. The divergent light beam signal emitted by the laser chip 21 of the transmitter 2 is converted into a converging light beam signal after passing through the positive lens 22, and the converging light beam signal is converted into a parallel light beam signal after passing through the negative lens 8.

[0043] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be included in the scope of the present invention.

Claims

1. A control method for a high-speed transceiver module for 5G fronthaul, characterized in that, The high-speed transceiver module includes a transmitter, a receiver, an input / output terminal, and an optical core component; the optical signal output from the input / output terminal is received by the receiver after passing through the optical core component; the optical signal emitted by the transmitter is received by the input / output terminal after passing through the optical core component. The optical core assembly includes a first polarizing beam splitter, a second polarizing beam splitter, a magneto-optical plate, a 22.5° 1 / 2 wave plate, and a magnetic plate; The input and output terminals are input and output at the reflecting surface of the second polarizing beam splitter; The control method for the high-speed transceiver module is as follows: The transmitting end emits a single-polarized light beam, which is split into a vertically polarized beam and a parallel-polarized beam. The divergent light signal emitted by the transmitting end is converted into a parallel light signal after passing through a positive lens. The vertically polarized beam emitted by the transmitting end is reflected by the polarization splitting surface of the first polarization beam splitter and then reaches the reflecting surface of the first polarization beam splitter. After being reflected by the reflecting surface, it reaches the 22.5° 1 / 2 waveplate. After passing through the 22.5° 1 / 2 waveplate and the magneto-optical plate, it is still a vertically polarized beam. The vertically polarized beam reaches the second polarization beam splitter and is then polarized by the second polarization beam splitter. The beam is reflected by the first polarizing beam splitter and then reaches the reflecting surface of the second polarizing beam splitter. After being reflected by the reflecting surface, it is received by the input and output terminals. The parallel polarized beam is transmitted through the polarizing beam splitter of the first polarizing beam splitter and reaches the 22.5° 1 / 2 waveplate. After passing through the 22.5° 1 / 2 waveplate and the magneto-optic plate, it is still a parallel polarized beam. The parallel polarized beam reaches the second polarizing beam splitter and is reflected by the reflecting surface of the second polarizing beam splitter. After being transmitted through the polarizing beam splitter, it reaches the reflecting surface of the second polarizing beam splitter and is received by the input and output terminals after being reflected by the reflecting surface. The input from the input / output terminals is an arbitrary polarization beam. The parallel-polarized beam is reflected by the reflecting surface of the second polarizing beam splitter and reaches its polarization splitting surface. After transmission through the polarization splitting surface, it reaches the reflecting surface of the second polarizing beam splitter, is reflected again, and reaches the magneto-optical plate. After passing through the magneto-optical plate and a 22.5° 1 / 2 waveplate, it becomes a vertically polarized beam. This vertically polarized beam reaches the first polarizing beam splitter, is reflected by its polarization splitting surface, and is received by the receiving end. The vertically polarized beam is reflected by the reflecting surface of the second polarizing beam splitter and reaches its polarization splitting surface. After reflection by the polarization splitting surface, it reaches the magneto-optical plate, passes through the magneto-optical plate and a 22.5° 1 / 2 waveplate, becomes a parallel-polarized beam, reaches the first polarizing beam splitter, is reflected by its reflecting surface, reaches its polarization splitting surface, is transmitted through the polarization splitting surface, and is received by the receiving end.

2. The control method for a high-speed transceiver module for 5G fronthaul according to claim 1, characterized in that: The second polarizing beam splitter is a parallelogram.

3. The control method for a high-speed transceiver module for 5G fronthaul according to claim 1, characterized in that: The optical core assembly also includes a 0° narrowband filter.

4. The control method for a high-speed transceiver module for 5G fronthaul according to claim 1, characterized in that: A 0° narrowband filter is provided between the receiver and the optical core assembly.

5. The control method for a high-speed transceiver module for 5G fronthaul according to claim 1, characterized in that: The transmitter uses a combination of a flat-window laser diode and an aspherical lens, or a combination of a negative lens and a converging laser diode.

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