WO2022057352A1

WO2022057352A1 - Single-fiber bidirectional multi-channel transmission optical module system

Info

Publication number: WO2022057352A1
Application number: PCT/CN2021/101385
Authority: WO
Inventors: 胡定坤; 李林科; 吴天书; 杨现文; 张健
Original assignee: 武汉联特科技股份有限公司
Priority date: 2020-09-17
Filing date: 2021-06-22
Publication date: 2022-03-24
Also published as: CN112180521A

Abstract

A single-fiber bidirectional multi-channel transmission optical module system, comprising optical modules (1) and a single-mode optical fiber (2), wherein there are two optical modules (1) which are interconnected by means of the single-mode optical fiber (2). The optical module (1) comprises an emission light path and a reception light path, wherein the emission light path comprises an emission unit assembly (13), an optical filter assembly (12) and an optical port (11); and the reception light path comprises a reception unit assembly (14), an optical filter assembly (12) and an optical port (11). The emission light path is used for combining, by means of the emission unit assembly (13), multiple light beams with different wavelengths that are generated by the current optical module (1) into one emission light beam with the same propagation direction, emitting the emission light beam to the single-mode optical fiber (2) by means of the optical filter assembly (12) and the optical port (11) in sequence, and transmitting the emission light beam to the other optical module (1) by means of the single-mode optical fiber (2). The reception light path is used for receiving the emission light beam of the other optical module (1) by means of the single-mode optical fiber (2) and taking same as a reception light beam of the current optical module (1), transmitting the reception light beam to the reception unit assembly (14) by means of the optical port (11) and the optical filter assembly (12) in sequence, and dividing, by means of the reception unit assembly (14), the reception light beam into multiple original light beams with different wavelengths.

Description

A single-fiber bidirectional multi-channel transmission optical module system

technical field

The invention relates to the field of optical fiber communication, in particular to a single-fiber bidirectional multi-channel transmission optical module system.

Background technique

With the process of digitization, the processing, storage and transmission of data have developed rapidly. The rapid growth of search services and video services with large data volumes has greatly driven the development of data centers based on supercomputers and storage. The design idea of the central optical module is to provide higher access density through smaller volume and lower cost, and ultimately improve user access capacity.

High-speed bidirectional multi-channel wavelength division multiplexing transmission optical modules have broad market application prospects. High-speed bidirectional multi-channel wavelength division multiplexing transmission optical module, the optical intercommunication between two optical modules is realized by a single optical fiber. In comparison, if one optical fiber is used, the work that can be completed by the original two optical fibers can be completed. The transmission capacity of the existing optical fiber is doubled, which will greatly save optical fiber resources.

SUMMARY OF THE INVENTION

In view of the technical defects and technical disadvantages existing in the prior art, the embodiments of the present invention provide a single-fiber bidirectional multi-channel transmission optical module system that overcomes the above problems or at least partially solves the above problems, and the specific solutions are as follows:

A single-fiber bidirectional multi-channel transmission optical module system, the system includes an optical module and a single-mode optical fiber, the optical modules are two, and the two optical modules are interconnected by a single-mode optical fiber; the optical module includes an emission optical path and a receiving optical path. an optical path, the transmitting optical path includes a transmitting unit assembly, an optical filter assembly and an optical port, and the receiving optical path includes a receiving unit assembly, an optical filter assembly and an optical port;

The emission light path is used to synthesize multiple light beams with different wavelengths generated by the current optical module through the emission unit component to synthesize a light beam with the same propagation direction, that is, the emission light beam, and the emission light beam is sequentially emitted to the single light beam through the optical filter assembly and the optical port. Mode fiber, which is transmitted to another optical module interconnected through single-mode fiber;

The receiving optical path is used to receive the emission beam from another interconnected optical module through a single-mode optical fiber, and as the receiving beam of the current optical module, the receiving beam is sequentially transmitted to the receiving unit assembly through the optical port and the filter assembly. , the received light beam is divided into original multi-path light beams with different wavelengths by the receiving unit assembly.

Further, the emission beam includes four wavelengths, respectively λ1, λ2, λ3 and λ4; the receiving beam includes four wavelengths, respectively λ5, λ6, λ7 and λ8;

Further, the filter assembly includes a three-piece synthetic filter assembly, and the three-piece synthetic filter assembly includes a first filter assembly, a second filter assembly, and a third filter assembly, so The first filter assembly, the second filter assembly and the third filter assembly are encircled into a triangle; the emission light beams emitted by the emission unit assembly are sequentially emitted through the first filter assembly and the second filter assembly to the optical port; the receiving beam incident from the optical port passes through the second filter assembly, the first filter assembly and the third filter assembly in sequence and then enters the receiving unit assembly; the emission beam emitted from the transmitting unit assembly passes through the first An optical filter assembly and a second optical filter assembly are parallel to the emission beam and exit to the optical port; the receiving beam incident from the optical port passes through the second optical filter assembly and the first optical filter assembly in turn and is perpendicular to the optical port. The received light beam is incident on the third filter assembly.

Further, the transmitting unit assembly includes multiple laser diodes, a plurality of first coupling lenses, an optical multiplexing component MUX, and an isolator Isolator;

The multi-channel laser diode is used as a carrier for signal transmission, and is used to transmit multiple channels of light beams with different wavelengths, and transmit the multiple channels of different wavelength light beams to a plurality of first coupling lenses respectively;

The first coupling lens is used for beam shaping the received light beam, shaping the divergent light into parallel light, and outputting it to the optical multiplexing component MUX;

The optical multiplexing component MUX is used for synthesizing multiple parallel beams emitted by the plurality of first coupling lenses into one, as the emission beam, and the combined emission beam enters the isolator Isolator;

The isolator is used to prevent the reflected light on the optical transmission link from entering the laser diode, affecting its corresponding high-frequency performance, and the emitted light beam passing through the isolator enters the optical filter assembly.

Further, the receiving unit component includes an optical demultiplexing component DEMUX, a plurality of second coupling lenses and a plurality of photodiodes;

Described optical demultiplexing assembly DEMUX is used for the received light beam to be divided into the light beam of original multiple paths of different wavelengths, and the multiple paths of different wavelength light beams after splitting enter a plurality of second coupling lenses respectively;

The second coupling lens is used for converting the incoming parallel light into convergent light, and the multiple-path light beams with different wavelengths are condensed by the corresponding second coupling lens and enter the photodiode;

The photodiode is used to realize the conversion of optical signals into electrical signals, so as to realize the optical path conversion of multiple optical signals.

Further, the filter assembly also includes a bandpass filter, the bandpass filter is located between the three-piece synthetic filter assembly and the receiving unit assembly, and the receiving beam passes through the optical port, the three-piece type and the receiving unit in sequence. The synthetic filter assembly and the band-pass filter are transmitted to the receiving unit assembly, and the band-pass filter is used for selective filtering to filter out astigmatism in the received light beam.

Further, the optical filter assembly also includes an optical path bending prism, the optical path bending prism is located between the bandpass filter and the receiving unit assembly, and the receiving beam passes through the optical port and the three-piece synthetic filter assembly in sequence. , a bandpass filter and an optical path bending prism are transmitted to the receiving unit assembly, and the optical path bending prism is used to reflect the light beam emitted by the bandpass filter to the receiving unit assembly.

Further, the system further includes an optical adapter and a third coupling lens, and the optical adapter and the third coupling lens are located between the filter assembly and the optical port;

The received light beam incident from the optical port is incident on the third coupling lens after passing through the optical adapter, and after being shaped into parallel light by the third coupling lens, it is incident on the filter assembly;

After the emission beam emitted from the emission unit assembly is shaped by the third coupling lens, the corresponding light energy is coupled into the optical adapter, and then exits to the optical port through the optical adapter.

Further, the optical module adopts QSFP, QSFP-DD or OSFP package.

The present invention has the following beneficial effects:

The invention defines a single-fiber bidirectional multi-channel wavelength division multiplexing transmission optical module in the limited package size required by the multi-source agreement (MSA). High-speed optical signals are interconnected between two optical modules through single-mode optical fibers, thereby realizing signal communication with each other. The optical module includes a transmitting unit component, a receiving unit component and an optical filter component, and each unit component contains a plurality of optical sub-unit components. The optical structure of the existing optical module is complex, and the positioning accuracy of each component is high. After the components are fixed, the displacement deviation is required to be small, which brings about the problem of complicated procedures and is not conducive to mass production. It is more conducive to the quality and cost control of optical packaging.

Description of drawings

FIG. 1 is a schematic diagram of optical interconnection of two optical modules according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of components of a packaging system provided by an embodiment of the present invention;

3 is a schematic diagram of an optical system corresponding to a package provided by an embodiment of the present invention;

4 is an optical path diagram of an optical module system provided by an embodiment of the present invention;

5 is an optical path diagram of an emission beam passing through an optical filter assembly provided by an embodiment of the present invention;

6 is an optical path diagram of a received light beam passing through an optical filter assembly provided by an embodiment of the present invention;

In the figure: 1. Optical module, 2. Single-mode fiber, 11, Optical port, 12, Filter assembly, 13, Transmitter unit assembly, 14, Receiver unit assembly, 15, Flexible circuit board FPC, 16, PCBA board, 17. Optical Adapter, 18. Third Coupling Lens, 121, Three-piece Synthetic Filter Assembly, 122, Bandpass Filter, 123, Optical Path Bending Prism, 131, Isolator, 132, Optical Multiplexing Assembly MUX, 133, first coupling lens, 134, laser diode, 141, optical demultiplexing component DEMUX, 142, second coupling lens, 143, reflector, 144, photodiode, 145, TIA.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The invention defines a single-fiber bidirectional multi-channel transmission optical module system, which adopts QSFP, QSFP-DD or OSFP package and adopts single-mode LC interface. When two optical modules 1 use single-mode optical fibers 2 for optical interconnection, high-speed and long-distance The basic structure of transmission, as shown in Figure 1, includes an optical module 1 and a single-mode optical fiber 2. There are two optical modules 1, and the two optical modules 1 are interconnected through the single-mode optical fiber 2; the optical module 1 includes a transmission Optical path and receiving optical path, the transmitting optical path includes a transmitting unit assembly 13, an optical filter assembly 12 and an optical port 11, and the receiving optical path includes a receiving unit assembly 14, an optical filter assembly 12 and an optical port 11;

The emitting light path is used to synthesize multiple light beams of different wavelengths generated by the current optical module 1 through the emitting unit assembly 13 to synthesize a light beam with the same propagation direction, that is, the emitted light beam, and pass the emitted light beam through the filter element 12 and the optical port in turn. 11 is emitted to the single-mode fiber 2, and is transmitted to another interconnected optical module 1 through the single-mode fiber 2;

The receiving optical path is used to receive the emission beam from another interconnected optical module 1 through the single-mode optical fiber 2, and as the receiving beam of the current optical module 1, the received beam passes through the optical port 11 and the filter assembly 12 in turn. It is transmitted to the receiving unit assembly 14, and the receiving unit assembly 14 divides the received light beam into the original multi-path light beams with different wavelengths.

As shown in FIG. 1 , the current optical module 1 generates multiple beams of different wavelengths, namely λ1, λ2, λ3 and λ4, and the emitted beams include four wavelengths, namely λ1, λ2, λ3 and λ4. The emitted light beam of the other optical module 1 includes four wavelengths, namely λ5, λ6, λ7 and λ8.

The optical interconnection of the two optical modules 1 is shown in FIG. 2 , and the two optical modules 1 are a first optical module and a second optical module.

The first optical module can emit four beams of different wavelengths and receive four beams of different wavelengths generated by the second optical module. The wavelengths corresponding to the four beams of different wavelengths emitted by the first optical module are λ1, λ2, λ3, λ4, the four beams pass through the optical multiplexing component MUX132 inside the module, and synthesize a beam with the same propagation direction, that is, the emission beam. The chip assembly 12 is then transmitted to the optical port 11 of the module; the received beam received through the optical port 11 of the first optical module includes four wavelengths of λ5, λ6, λ7, and λ8, and the received beam is transmitted to the optical filter assembly 12. The optical filter assembly 12. Realize direction selection, transmit the received beam to the optical demultiplexing component DEMUX141, and the optical demultiplexing component DEMUX141 divides one beam into four beams with wavelengths of λ5, λ6, λ7, and λ8.

The second optical module can emit four beams of different wavelengths and receive four beams of different wavelengths generated by the first optical module. The wavelengths corresponding to the four beams of different wavelengths emitted by the second optical module are λ5, λ6, λ7, λ8, the four beams pass through the optical multiplexing component MUX132 inside the module, and synthesize one beam with the same propagation direction, that is, the emission beam of the second optical module, which is transmitted to the filter assembly 12 and then transmitted to the module optical port 11 ; The receiving beam received by the optical port 11 of the second optical module includes four wavelengths of λ1, λ2, λ3 and λ4, and the receiving beam is transmitted to the filter assembly 12, and the filter assembly 12 realizes direction selection, and transmits the received beam. To the optical demultiplexing component DEMUX141, the optical demultiplexing component DEMUX141 divides one beam into four beams with wavelengths of λ1, λ2, λ3, and λ4.

Figure 2 is a schematic diagram of the components of the packaging system, including the PCBA board 16, the receiving unit component 14, the transmitting unit component 13, the filter component 12 and the flexible circuit board FPC15, wherein the receiving unit component and the transmitting unit component pass through the flexible circuit respectively. The board FPC15 is electrically connected to the PCBA board.

The optical system corresponding to the package is shown in Figure 3. From left to right, the transmitting end includes a flexible circuit board FPC15, four laser diodes 134, four first coupling lenses 133, an optical multiplexing component MUX132, an isolator Isolator131, and filters. Assembly 12 , optical adapter 17 and optical port 11 . From left to right, the receiving end includes a flexible circuit board FPC15, four TIA145 and four photodiodes 144, four mirrors 143, four second coupling lenses 142, an optical demultiplexing component DEMUX141, an optical path bending prism 123, a bandpass The optical filter 122 , the optical filter assembly 12 , the third coupling lens 18 , the optical adapter 17 and the optical port 11 .

The optical circuit diagram of the optical module 1 system is shown in FIG. 4 , the four first coupling lenses 133 are Lens1, Lens2, Lens3 and Lens4 respectively, the four laser diodes are LD1, LD2, LD3 and LD4 respectively, and the four photodiodes 144 are respectively PD1, PD2, PD3 and PD4, the four second coupling lenses 142 are Lens5, Lens6, Lens7 and Lens8 respectively; the wavelengths corresponding to the four emission beams are λ1, λ2, λ3 and λ4 respectively, after the four first coupling lenses After Lens1, Lens2, Lens3, Lens4 are formed into parallel beams, they are incident on the optical multiplexing component MUX132 for multiplexing to form a beam of light in the same transmission direction, and then pass through the isolator Isolator131 and transmit to the three-piece synthetic filter assembly 121 , and then shaped by the third coupling lens 18 , and the corresponding light energy is coupled into the optical adapter 17 . The wavelengths corresponding to the received light beams are λ5, λ6, λ7, and λ8, respectively, and are incident on the third coupling lens 18 through the optical adapter 17, and after being shaped into parallel light by the third coupling lens 18, incident on the three-piece synthetic filter assembly 121 , and after selective filtering by the bandpass filter 122, it is transmitted to the optical path bending prism 123, and after the optical path bending action of the optical path bending prism 123, it is incident on the optical demultiplexing component DEMUX141 for demultiplexing, corresponding to different wavelengths. The light energy is respectively shaped into condensed light by four second coupling lenses Lens5, Lens6, Lens7 and Lens8, and then coupled into the four photodiodes PD1, PD2, PD3 and PD4 respectively.

The filter assembly 12 includes a three-piece synthetic filter assembly 121, and the three-piece synthetic filter assembly 121 includes a first filter assembly, a second filter assembly and a third filter assembly , the first filter assembly, the second filter assembly and the third filter assembly form a triangle; the parallel light passing through the isolator Isolator 131 enters the three-piece synthetic filter assembly 121, and the corresponding beam transmits The path is shown in FIG. 5 , and the light beams are emitted through the first filter assembly and the second filter assembly in sequence. The parallel light passing through the third coupling lens 18 is incident on the three-piece synthetic filter assembly 12 , and the corresponding beam transmission path is shown in FIG. 6 . The plate assembly and the third filter assembly are then incident on the receiving unit assembly 14 .

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection of the present invention. within the range.

Claims

A single-fiber bidirectional multi-channel transmission optical module system, characterized in that the system includes an optical module and a single-mode optical fiber, the optical modules are two, and the two optical modules are interconnected by the single-mode optical fiber; the optical module includes A transmitting optical path and a receiving optical path, the transmitting optical path includes a transmitting unit assembly, an optical filter assembly and an optical port, and the receiving optical path includes a receiving unit assembly, an optical filter assembly and an optical port;

The emission light path is used to synthesize multiple light beams with different wavelengths generated by the current optical module through the emission unit component to synthesize a light beam with the same propagation direction, that is, the emission light beam, and the emission light beam is sequentially emitted to the single light beam through the optical filter assembly and the optical port. Mode fiber, which is transmitted to another optical module interconnected through single-mode fiber;

The receiving optical path is used to receive the emission beam from another interconnected optical module through a single-mode optical fiber, and as the receiving beam of the current optical module, the receiving beam is sequentially transmitted to the receiving unit assembly through the optical port and the filter assembly. , the received light beam is divided into original multi-path light beams with different wavelengths by the receiving unit assembly.
The single-fiber bidirectional multi-channel transmission optical module system according to claim 1, wherein the emission beam includes four wavelengths, respectively λ1, λ2, λ3 and λ4; the receiving beam includes four wavelengths, respectively are λ5, λ6, λ7 and λ8.
The single-fiber bidirectional multi-channel transmission optical module system according to claim 1, wherein the filter assembly comprises a three-piece synthetic filter assembly, and the three-piece synthetic filter assembly includes a first filter A filter assembly, a second filter assembly and a third filter assembly, the first filter assembly, the second filter assembly and the third filter assembly form a triangle; The emission beam passes through the first filter assembly and the second filter assembly in turn and exits to the optical port; the receiving beam incident from the optical port sequentially passes through the second filter assembly, the first filter assembly and the third filter assembly The chip assembly is then incident on the receiving unit assembly.
The single-fiber bidirectional multi-channel transmission optical module system according to claim 1, wherein the transmitting unit component comprises multiple laser diodes, a plurality of first coupling lenses, an optical multiplexing component MUX and an isolator Isolator ;

The multi-channel laser diode is used as a carrier for signal transmission, and is used to transmit multiple channels of light beams with different wavelengths, and transmit the multiple channels of different wavelength light beams to a plurality of first coupling lenses respectively;

The first coupling lens is used for beam shaping the received light beam, shaping the divergent light into parallel light, and outputting it to the optical multiplexing component MUX;

The optical multiplexing component MUX is used for synthesizing multiple parallel beams emitted by the plurality of first coupling lenses into one, as the emission beam, and the combined emission beam enters the isolator Isolator;

The isolator is used to prevent the reflected light on the optical transmission link from entering the laser diode, and the emitted light beam passing through the isolator enters the filter assembly.
The single-fiber bidirectional multi-channel transmission optical module system according to claim 1, wherein the receiving unit component comprises an optical demultiplexing component DEMUX, a plurality of second coupling lenses and a plurality of photodiodes;

The optical demultiplexing component DEMUX is used to divide the received light beams into original multi-path light beams with different wavelengths, and the multi-path light beams with different wavelengths after splitting enter a plurality of second coupling lenses respectively;

The second coupling lens is used for converting the incoming parallel light into convergent light, and the multiple-path light beams with different wavelengths are condensed by the corresponding second coupling lens and enter the photodiode;

The photodiode is used to realize the conversion of optical signals into electrical signals, so as to realize the optical path conversion of multiple optical signals.
The single-fiber bidirectional multi-channel transmission optical module system according to claim 3, wherein the filter assembly further comprises a band-pass filter, and the band-pass filter is located in a three-piece synthetic filter Between the component and the receiving unit component, the received light beam is transmitted to the receiving unit component through the optical port, the three-piece synthetic filter component and the band-pass filter in sequence, and the band-pass filter is used for selective filtering. Removes astigmatism in the received beam.
The single-fiber bidirectional multi-channel transmission optical module system according to claim 6, wherein the filter assembly further comprises an optical path bending prism, and the optical path bending prism is located in the bandpass filter and the receiving unit assembly In between, the received light beam is transmitted to the receiving unit assembly through the optical port, the three-piece synthetic filter assembly, the bandpass filter and the optical path bending prism in sequence, and the optical path bending prism is used to output the bandpass filter. The light beam is reflected to the receiving unit assembly.
The single-fiber bidirectional multi-channel transmission optical module system according to claim 1, wherein the system further comprises an optical adapter and a third coupling lens, and the optical adapter and the third coupling lens are located at the filter assembly and the optical port between;

The received light beam incident from the optical port is incident on the third coupling lens after passing through the optical adapter, and after being shaped into parallel light by the third coupling lens, it is incident on the filter assembly;

After the emission beam emitted from the emission unit assembly is shaped by the third coupling lens, the corresponding light energy is coupled into the optical adapter, and then exits to the optical port through the optical adapter.
The single-fiber bidirectional multi-channel transmission optical module system according to claim 1, wherein the optical module adopts QSFP, QSFP-DD or OSFP package.