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

Abstract

The present invention relates to a high-speed transceiver module for 5G fronthaul and a control method thereof, comprising a transmitting end, a receiving end, an input-output end and an optical core component; the optical signal output by the input-output end passes through the optical core component and is received by the receiving end; the optical signal emitted by the transmitting end passes through the optical core component and is received by the input-output end. The present invention avoids interference between adjacent wavelengths with ultra-narrow intervals, achieves high isolation and high return loss of adjacent wavelengths with ultra-narrow intervals, and enables a high-speed transceiver module with a 7nm interval and a 2nm transition band of the fronthaul module in the 5G sub-item standard to be realized.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber communication technology, and in particular to a 5G fronthaul high-speed transceiver module and a control method thereof. 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 adjacent wavelength single-fiber bidirectional components is also increasing.

[0003] In order to meet the current popular 5G fronthaul network needs, in the 5G fronthaul solution, only one optical fiber is laid from the base station to the computer room. The base station equipment can be 6-wave or 12-wave, and then several corresponding wavelengths are selected according to the needs of business development. Both the base station and the computer room need to use the splitter and combiner module to multiplex the light of different wavelengths from the optical module into one optical fiber, and split the light of different wavelengths from the optical fiber into each optical module. The typical application of the currently proposed 5G fronthaul solution is to use a 6-wave CWDM solution with wavelengths separated by 20nm, and the wavelengths are 1271nm, 1291nm, 1311nm, 1331nm, 1351nm, and 1371nm respectively.

[0004] For fronthaul, there are 5G independent networking and 4G hybrid networking. In the case of hybrid networking, a base station actually has 4G signals and 5G signals. A 4G base station has 6 wavelengths, and 5G also needs 6 wavelengths. In order to facilitate base station compatibility in the future, 12 wavelengths are required when 4G and 5G are hybrid networked. The innovative Open-WDM / MWDM solution proposed is based on the existing six-channel CWDM 20nm channel wavelength spacing. The solution is to increase and decrease the 3.5nm wavelength offset. Each channel transmits two wavelength signals of CW-3.5nm and CW+3.5nm, forming a 12-wave signal wavelength division multiplexing module with non-equidistant wavelength spacing, such as Figure 1 The 12 wavelengths shown.

[0005] Currently, the single-fiber bidirectional components on the market all use two wavelengths of optical signals with a very wide wavelength interval.

[0006] The principle of the simplest structure of single-fiber bidirectional optical transceiver module components, such as Figure 2As shown, the optical signal enters the optical component from the common end 1 through the optical fiber. In the optical component, the first filter 11 is at a 45-degree angle to the optical path. The light beam passes through the first filter 11 and is reflected 90 degrees. It is then filtered by the second filter 12, and then the light beam is received by the receiving end 3. The receiving end 3 uses a PD photodiode as a light detector for photoelectric conversion to convert the optical signal into an electrical signal. The transmitting end 2 uses a laser diode, and the light beam from the transmitting end 2 is transmitted through the first filter 11 into the common end 1.

[0007] The principle of the traditional dual-wavelength single-fiber bidirectional optical transceiver module assembly is as follows Figure 3 As shown, other principles and descriptions are the same Figure 2 ,In order to increase signal stability and reduce various interferences during transmission, an optical isolator 13 (consisting of a magnetic ring, two polarizers, and a magnetic rotator) is placed at the front end of the transmitter 2 , so that the line interference will not be 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, in order to meet application requirements, the wavelengths of the transmitting and receiving ends must be wide enough, otherwise the transmitted wavelength signal or the reflected wavelength signal cannot be effectively separated. Summary of the invention

[0009] In view of this, the object of the present invention is to provide a high-speed transceiver module for 5G fronthaul and a control method thereof, so as to avoid interference between adjacent wavelengths with ultra-narrow intervals and achieve high isolation and high return loss between adjacent wavelengths with ultra-narrow intervals.

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

[0011] A high-speed transceiver module for 5G fronthaul includes a transmitting end, a receiving end, an input / output end, and an optical core component; the optical signal output by the input / output end passes through the optical core component and is received by the receiving end; the optical signal emitted by the transmitting end passes through the optical core component and is received by the input / output end.

[0012] Furthermore, the optical core component includes a first polarization beam splitter prism, a second polarization beam splitter prism, a 0° narrowband filter, a magnetic rotator, a 22.5° 1 / 2 wave plate and a magnetic plate.

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

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

[0015] Furthermore, the input and output ends are input and output on the polarization splitting surface of the second polarization splitting prism.

[0016] Furthermore, the input and output ends are input and output on the reflection surface of the second polarization beam splitter prism.

[0017] Furthermore, a 0° narrowband filter is provided between the receiving end and the optical core component.

[0018] Furthermore, the transmitting end adopts a combination of a flat-window laser diode and a non-spherical lens or a combination of a negative lens and a focusing light laser diode.

[0019] A control method for a high-speed transceiver module of a 5G fronthaul, wherein a single polarization state light beam is emitted from a transmitting end, and the single polarization state light beam is divided into a vertical polarization light beam and a parallel polarization light beam; a divergent light beam light signal emitted from the transmitting end is converted into a parallel light beam light signal after passing through a positive lens; a vertical polarization light beam emitted from the transmitting end is reflected by a polarization splitting surface of a first polarization splitting prism and reaches a reflecting surface of the first polarization splitting prism, and is reflected by the reflecting surface and reaches a 22.5°1 / 2 wave plate, and is converted into a parallel polarization light beam after passing through the 22.5°1 / 2 wave plate and a magnetic rotator plate. After the parallel polarized light beam reaches the second polarization beam splitter prism, it is transmitted through the polarization beam splitting surface of the second polarization beam splitter prism and then received by the input and output ends; the parallel polarized light beam is transmitted through the polarization beam splitting surface 4 of the first polarization beam splitter prism and then reaches the 22.5°1 / 2 wave plate, and after passing through the 22.5°1 / 2 wave plate and the magnetic rotatory plate, it becomes a vertical polarized light beam, and after the vertical polarized light beam reaches the second polarization beam splitter prism, it is reflected by the reflection surface of the second polarization beam splitter prism and then reaches the polarization beam splitting surface of the second polarization beam splitter prism, and is reflected by the polarization beam splitting surface and then received by the input and output ends.

[0020] The input and output ends input a beam of light in any polarization state, wherein the parallel polarized light beam is transmitted through the polarization splitting surface of the second polarization splitting prism and reaches the magnetic rotator plate, after passing through the magnetic rotator plate and the 22.5°1 / 2 wave plate, the parallel polarized light beam reaches the first polarization splitting prism, after being reflected by the reflection surface of the first polarization splitting prism, reaches the polarization splitting surface of the first polarization splitting prism, and is received by the receiving end after being transmitted through the polarization splitting surface; wherein the vertical polarized light beam is reflected through the polarization splitting surface of the second polarization splitting prism and reaches the reflection surface of the second polarization splitting prism, after being reflected by the reflection surface, reaches the magnetic rotator plate, after passing through the magnetic rotator plate and the 22.5°1 / 2 wave plate, the vertical polarized light beam reaches the first polarization splitting prism, after being reflected by the polarization splitting surface of the first polarization splitting prism, is received by the receiving end.

[0021] A control method for a high-speed transceiver module of a 5G fronthaul, wherein the transmitting end emits a single polarization state light beam, which is divided into a vertical polarization light beam and a parallel polarization light beam; the divergent light beam light signal emitted by the transmitting end is converted into a parallel light beam light signal after passing through a positive lens; the vertical polarization light beam emitted by the transmitting end is reflected by the polarization splitting surface of a first polarization splitting prism and reaches the reflecting surface of the first polarization splitting prism, and after being reflected by the reflecting surface, it reaches a 22.5°1 / 2 wave plate, and after passing through the 22.5°1 / 2 wave plate and a magnetic rotation plate, it is still a vertical polarization light beam, and after the vertical polarization light beam reaches a second polarization splitting prism, it passes through the second The polarization splitting surface of the polarization splitting prism is reflected and reaches the reflecting surface of the second polarization splitting prism, and is received by the input and output ends after being reflected by the reflecting surface; the parallel polarized light beam is transmitted through the polarization splitting surface of the first polarization splitting prism and reaches the 22.5°1 / 2 wave plate, and after passing through the 22.5°1 / 2 wave plate and the magnetic rotatory plate, it is still a parallel polarized light beam, and after the parallel polarized light beam reaches the second polarization splitting prism, it is reflected by the reflecting surface of the second polarization splitting prism and reaches the polarization splitting surface 421 of the second polarization splitting prism, and reaches the reflecting surface of the second polarization splitting prism after being transmitted through the polarization splitting surface, and is received by the input and output ends after being reflected by the reflecting surface;

[0022] The input and output ends input a beam of arbitrary polarization state, wherein the parallel polarized beam is reflected by the reflection surface of the second polarization beam splitter prism and reaches the polarization beam splitting surface of the second polarization beam splitter prism, and is transmitted by the polarization beam splitting surface and reaches the reflection surface of the second polarization beam splitter prism, and is reflected by the reflection surface and reaches the magnetic rotator plate, and is transformed into a vertical polarized beam after passing through the magnetic rotator plate and the 22.5°1 / 2 wave plate, and the vertical polarized beam reaches the first polarization beam splitter prism, and is reflected by the polarization beam splitting surface of the first polarization beam splitter prism and is received by the receiving end; wherein the vertical polarized beam is reflected by the reflection surface of the second polarization beam splitter prism and reaches the polarization beam splitting surface of the second polarization beam splitter prism, and is reflected by the polarization beam splitting surface and reaches the magnetic rotator plate, and is transformed into a parallel polarized beam after passing through the magnetic rotator plate and the 22.5°1 / 2 wave plate, and the parallel polarized beam reaches the first polarization beam splitter prism, and is reflected by the reflection surface of the first polarization beam splitter prism and reaches the polarization beam splitting surface of the first polarization beam splitter prism, and is transmitted by the polarization beam splitting surface and is received by the receiving end.

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

[0024] The present invention uses an optical core component composed of optical elements such as a polarization beam splitter prism, a magnetic rotator and a wave plate, and adopts collimated light in the optical path, so that ultra-narrow interval adjacent wavelengths can be effectively separated; a 0° narrow-band filter is placed at the receiving end to avoid interference between ultra-narrow interval adjacent wavelengths, achieve high isolation and high return loss between ultra-narrow interval adjacent wavelengths, and realize a high-speed transceiver module with a 7nm interval and a 2nm transition band of the fronthaul module in the 5G sub-item standard. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0028] Figure 4 This is a schematic diagram of the optical principle of a high-speed transceiver module for 5G fronthaul according to the first embodiment 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 the second embodiment 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 It is another optical principle schematic diagram of parallel light output at the emission end according to an embodiment of the present invention.

[0032] In the figure: input and output end-1, transmitting end-2, laser chip-21 of transmitting end 2, positive lens-22,

[0033] Receiving end-3, optoelectronic receiving chip-31 of receiving end 3, positive lens-32, first polarization beam splitter prism-41, second polarization beam splitter prism-42, 0° narrowband filter-5, 22.5°1 / 2 wave plate-6, magnetic rotator plate-7, negative lens-8. DETAILED DESCRIPTION

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

[0035] The present invention provides a high-speed transceiver module for 5G fronthaul, comprising an input and output terminal 1, a transmitting terminal 2, a laser chip 21 of the transmitting terminal 2, a positive lens 22, a receiving terminal 3, an optoelectronic receiving chip 31 of the receiving terminal 3, a positive lens 32, and an optical core component. The optical core component comprises a first polarization beam splitter prism 41, a second polarization beam splitter prism 42, a 0° narrowband filter 5, a 22.5° 1 / 2 wave plate 6, and a magnetic optical rotation plate 7.

[0036] Example 1, please refer to Figure 4 , this embodiment includes an input and output end 1, a transmitting end 2, a laser chip 21 of the transmitting end 2, a positive lens 22, a receiving end 3, a photoelectric receiving chip 31 of the receiving end 3, a positive lens 32, and an optical core component. The optical core component includes a first polarization beam splitter prism 41, a second polarization beam splitter prism 42, a 0° narrowband filter 5, a 22.5° 1 / 2 wave plate 6, and a magnetic rotation plate 7. The optical core component is glued and fixed on the magnetic plate. The transmitting end 2 emits a single polarization state light beam, which is divided into a vertical polarization light beam and a parallel polarization light beam. The divergent light beam light signal emitted by the laser chip 21 of the transmitting end 2 is converted into a parallel light beam light signal after passing through the positive lens 22. The vertical polarized light beam emitted by the transmitting end 2 is reflected by the polarization splitting surface 411 of the first polarization splitting prism 41 and reaches the reflecting surface 412 of the first polarization splitting prism 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 magnetic rotatory plate 7, it becomes a parallel polarized light beam. After reaching the second polarization splitting prism 42, the parallel polarized light beam is transmitted through the polarization splitting surface 421 of the second polarization splitting prism 42 and then connected to the input and output end 1. The parallel polarized light beam is transmitted through the polarization splitting surface 411 of the first polarization splitting prism 41 and reaches the 22.5°1 / 2 wave plate 6. After passing through the 22.5°1 / 2 wave plate 6 and the magnetic rotatory plate 7, it becomes a vertical polarized light beam. After the vertical polarized light beam reaches the second polarization splitting prism 42, it is reflected by the reflection surface 422 of the second polarization splitting prism 42 and reaches the polarization splitting surface 421 of the second polarization splitting prism 42. After being reflected by the polarization splitting surface 421, it is received by the input and output 1.

[0037] The input of the input and output end 1 is a beam of light in any polarization state. The parallel polarized light beam is transmitted through the polarization splitting surface 421 of the second polarization splitting prism 42 and reaches the magnetic rotator plate 7. After passing through the magnetic rotator plate 7 and the 22.5° 1 / 2 wave plate 6, the parallel polarized light beam reaches the first polarization splitting prism 41, and is reflected by the reflection surface 412 of the first polarization splitting prism 41 and reaches the polarization splitting surface 411 of the first polarization splitting prism 41. After being transmitted through the polarization splitting surface 411, the polarized light beam is received by the receiving The vertical polarized light beam is reflected by the polarization splitting surface 421 of the second polarization splitting prism 42 and reaches the reflecting surface 422 of the second polarization splitting prism 42, and then reaches the magnetic rotatory plate 7 after being reflected by the reflecting surface 422. After passing through the magnetic rotatory plate 7 and the 22.5°1 / 2 wave plate 6, the vertical polarized light beam reaches the first polarization splitting prism 41, and then is received by the receiving end photodetector 3 after being reflected by the polarization splitting surface 411 of the first polarization splitting prism 41.

[0038] Example 2, please refer to Figure 5 The optical path principle of this embodiment is the same as that of the first embodiment, except that the shape of the second polarization beam splitter prism 42 is slightly different from that of the first embodiment. The second polarization beam splitter prism 42 of the first embodiment is a trapezoid with right angles, while the second polarization beam splitter prism 42 of the second embodiment is a parallelogram.

[0039] Example 3, reference Figure 6 In this embodiment, the shape of the second polarization beam splitter prism 42 is the same as that of the second embodiment, which is a parallelogram. In this embodiment, the input and output end 1 is input and output at the reflection surface 423 of the second polarization beam splitter prism 42. Figure 6 As shown; in embodiments one and two, the input and output end 1 is input and output at the polarization splitting surface 421 of the second polarization splitting prism 42, such as Figure 4 and Figure 5 The magnetic field direction of the magnetic sheet in the third embodiment is different from that of the magnetic sheets in the first and second embodiments. Due to the different magnetic field directions, the polarization state rotation direction of the light beam by the magnetic optical rotation sheet 7 is also different.

[0040] In this embodiment, the transmitting end 2 emits a single polarization state light beam, which is divided into a vertical polarization state light beam and a parallel polarization state light beam. The divergent light beam light signal emitted by the laser chip 21 of the transmitting end 2 is converted into a parallel light beam light signal after passing through the positive lens 22. The vertical polarization light beam emitted by the transmitting end 2 is reflected by the polarization splitting surface 411 of the first polarization splitting prism 41 and reaches the reflection surface 412 of the first polarization splitting prism 41. After being reflected by the reflection 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 magnetic rotation plate 7, it is still a vertical polarization light beam. After reaching the second polarization splitting prism 42, the vertical polarization light beam is reflected by the polarization splitting surface 421 of the second polarization splitting prism 42 and reaches the reflection surface 423 of the second polarization splitting prism 42. After being reflected by the reflection surface 423, it is connected to the input and output end 1. Receive; the parallel polarized light beam is transmitted through the polarization splitting surface 411 of the first polarization splitting prism 41 and reaches the 22.5°1 / 2 wave plate 6. After passing through the 22.5°1 / 2 wave plate 6 and the magnetic rotation plate 7, it is still a parallel polarized light beam. After the parallel polarized light beam reaches the second polarization splitting prism 42, it is reflected by the reflection surface 422 of the second polarization splitting prism 42 and reaches the polarization splitting surface 421 of the second polarization splitting prism 42. After being transmitted through the polarization splitting surface 421, it reaches the reflection surface 423 of the second polarization splitting prism 42, and is reflected by the reflection surface 423 and received by the input and output 1.

[0041] The input of the input and output end 1 is a beam of light in any polarization state, wherein the parallel polarized light beam is reflected by the reflection surface 423 of the second polarization beam splitter prism 42 and reaches the polarization beam splitting surface 421 of the second polarization beam splitter prism 42, and then reaches the reflection surface 422 of the second polarization beam splitter prism 42 after being transmitted through the polarization beam splitting surface 421, and then reaches the magnetic rotator plate 7 after being reflected by the reflection surface 422, and then becomes a vertical polarized light beam after passing through the magnetic rotator plate 7 and the 22.5° 1 / 2 wave plate 6, and then reaches the first polarization beam splitter prism 41, and then is reflected by the polarization beam splitting surface 411 of the first polarization beam splitter prism 41 and then is transmitted by the receiving end light beam. The photodetector 3 receives the vertical polarized light beam, which is reflected by the reflection surface 423 of the second polarization beam splitter prism 42 and reaches the polarization beam splitting surface 421 of the second polarization beam splitter prism 42, and reaches the magnetic rotator plate 7 after being reflected by the polarization beam splitting surface 421, and becomes a parallel polarized light beam after passing through the magnetic rotator plate 7 and the 22.5° 1 / 2 wave plate 6, and reaches the first polarization beam splitter prism 41, and reaches the polarization beam splitting surface 411 of the first polarization beam splitter prism 41 after being reflected by the reflection surface 412 of the first polarization beam splitter prism 41, and is received by the receiving end photodetector 3 after being transmitted through the polarization beam splitting surface 411.

[0042] Please refer to Figure 7, another optical principle diagram of the parallel light output of the transmitting end of the embodiment of the present invention. The divergent light beam signal emitted by the laser chip 21 of the transmitting end 2 is converted into a convergent light beam signal after passing through the positive lens 22, and the convergent 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 according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A control method for a high-speed transceiver module of a 5G fronthaul, characterized in that: The high-speed transceiver module includes a transmitting end, a receiving end, an input / output end and an optical core component; the optical signal output by the input / output end passes through the optical core component and is received by the receiving end; the optical signal emitted by the transmitting end passes through the optical core component and is received by the input / output end; The optical core assembly includes a first polarization beam splitter prism, a second polarization beam splitter prism, a magnetic optical rotation plate, a 22.5° 1 / 2 wave plate and a magnetic plate; The input and output ends are input and output at the polarization splitting surface of the second polarization splitting prism; The control method of the high-speed transceiver module is specifically as follows: The transmitting end emits a single polarization state light beam, which is divided into a vertical polarization light beam and a parallel polarization light beam; the divergent light beam light signal emitted by the transmitting end is converted into a parallel light beam light signal after passing through a positive lens; the vertical polarization light beam emitted by the transmitting end is reflected by the polarization splitting surface of the first polarization splitting prism and reaches the reflecting surface of the first polarization splitting prism, and then reaches the 22.5°1 / 2 wave plate after being reflected by the reflecting surface, and then becomes a parallel polarization light beam after passing through the 22.5°1 / 2 wave plate and the magnetic rotation plate, and the parallel polarization light beam arrives After reaching the second polarization beam splitter prism, it is transmitted through the polarization beam splitting surface of the second polarization beam splitter prism and then received by the input and output ends; the parallel polarized light beam is transmitted through the polarization beam splitting surface of the first polarization beam splitter prism and then reaches the 22.5°1 / 2 wave plate, and after passing through the 22.5°1 / 2 wave plate and the magnetic rotatory plate, it becomes a vertical polarized light beam, and after reaching the second polarization beam splitter prism, the vertical polarized light beam is reflected by the reflection surface of the second polarization beam splitter prism and then reaches the polarization beam splitting surface of the second polarization beam splitter prism, and then is reflected by the polarization beam splitting surface and then received by the input and output ends; The input and output ends input a beam of light in any polarization state, wherein the parallel polarized light beam is transmitted through the polarization splitting surface of the second polarization splitting prism and reaches the magnetic rotator plate, after passing through the magnetic rotator plate and the 22.5°1 / 2 wave plate, the parallel polarized light beam reaches the first polarization splitting prism, after being reflected by the reflection surface of the first polarization splitting prism, reaches the polarization splitting surface of the first polarization splitting prism, and is received by the receiving end after being transmitted through the polarization splitting surface; wherein the vertical polarized light beam is reflected through the polarization splitting surface of the second polarization splitting prism and reaches the reflection surface of the second polarization splitting prism, after being reflected by the reflection surface, reaches the magnetic rotator plate, after passing through the magnetic rotator plate and the 22.5°1 / 2 wave plate, the vertical polarized light beam reaches the first polarization splitting prism, after being reflected by the polarization splitting surface of the first polarization splitting prism, is received by the receiving end.

2. The control method of a high-speed transceiver module for 5G fronthaul according to claim 1, characterized in that: The second polarization beam splitting prism is a trapezoid or a parallelogram with right-angled sides.

3. The control method of 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 of a high-speed transceiver module for 5G fronthaul according to claim 1, characterized in that: A 0° narrowband filter is arranged between the receiving end and the optical core component.

5. The control method of a high-speed transceiver module for 5G fronthaul according to claim 1, characterized in that: The transmitting end adopts a combination of a flat window laser diode and a non-spherical lens or a combination of a negative lens and a focusing light laser diode.

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