阅读说明：本技术 一种相干光多路复用的1+1保护装置及方法 (1+1 protection device and method for coherent light multiplexing ) 是由 胡佩钢 王亚军 于 2020-05-29 设计创作，主要内容包括：本发明公开了一种相干光多路复用的1+1保护装置及方法,装置包括：N路复用/解复用单元,每路复用/解复用单元均包括复用子单元和解复用子单元；N路中转端口,与N路复用/解复用单元一一对应并连接,每路中转端口均包括与复用/解复用单元对应的复用传输单元和解复用传输单元；两路传输端口；第一光分路器,其包括与N路中转端口连接的N个输入端口和与两路传输端口连接的两个输出端口；光开关,其分别通过两个输入接口与两路传输端口的输入单元连接；第二光分路器,为1×N光分路器,其具有与光开关的输出接口连接的一个输入端口和与N路中转端口的解复用传输单元连接的N个输出端口,该方案实施可靠、插损低,且传输性能好。(The invention discloses a 1+1 protection device and a method for coherent light multiplexing, wherein the device comprises: each path of multiplexing/demultiplexing unit comprises a multiplexing subunit and a demultiplexing subunit; n-path transit ports which are in one-to-one correspondence with the N-path multiplexing/demultiplexing units and are connected with the N-path multiplexing/demultiplexing units, and each path of transit port comprises a multiplexing transmission unit and a demultiplexing transmission unit which correspond to the multiplexing/demultiplexing units; two transmission ports; the first optical splitter comprises N input ports connected with the N-path transit ports and two output ports connected with the two-path transmission ports; the optical switch is respectively connected with the input units of the two transmission ports through two input interfaces; the second optical splitter is a 1 XN optical splitter and is provided with one input port connected with the output interface of the optical switch and N output ports connected with the demultiplexing and transmission units of the N paths of transit ports.)

1. A 1+1 protection device for coherent optical multiplexing, comprising: it includes:

each path of multiplexing/demultiplexing unit comprises a multiplexing subunit and a demultiplexing subunit;

the N-path transit ports are in one-to-one correspondence with the N-path multiplexing/demultiplexing units and are connected with the N-path multiplexing/demultiplexing units, and each path of transit port comprises a multiplexing transmission unit and a demultiplexing transmission unit, wherein the multiplexing transmission unit is used for receiving signals transmitted by the multiplexing sub-units which are butted with the multiplexing transmission unit, and the demultiplexing transmission unit is used for transmitting the signals to the demultiplexing sub-units which are butted with the demultiplexing transmission unit;

two transmission ports, each transmission port comprising an output unit and an input unit;

the first optical splitter is an Nx 2 optical splitter and comprises N input ports and two output ports, wherein the N input ports of the first optical splitter are connected with the multiplexing transmission unit of the N-path transfer unit, and the two output ports of the first optical splitter are respectively connected with the output units of the two paths of transmission ports;

the optical switch is a 2 x 1 optical switch, is provided with two input interfaces and one output interface, and is respectively connected with the input units of the two transmission ports through the two input interfaces;

and the second optical splitter is a 1 XN optical splitter and is provided with an input port and N output ports, the input port of the second optical splitter is connected with the output interface of the optical switch, and the N output ports of the second optical splitter are respectively connected with the demultiplexing transmission unit of the N-path transit port.

2. The 1+1 protection device for coherent optical multiplexing according to claim 1, wherein: the optical switch further comprises a packaging shell, wherein the packaging shell is used for packaging the N-path transfer port, the two-path transmission port, the first optical splitter, the optical switch and the second optical splitter into an integral structure.

3. The 1+1 protection device for coherent optical multiplexing according to claim 1, wherein: and a first optical amplifier is arranged between the optical switch and the second optical splitter.

4. The 1+1 protection device for coherent optical multiplexing according to claim 1, wherein: and a second optical amplifier is also arranged between the N output ports of the second optical splitter and the demultiplexing transmission unit of the N-path transit port.

5. The 1+1 protection device for coherent optical multiplexing according to claim 1, wherein: the multiplexing/demultiplexing unit is an AWG/AAWG module with a filtering function, a WSS module, a cascaded TFF module or a 1: N optical coupling module without filtering.

6. The 1+1 protection device for coherent optical multiplexing according to claim 1, wherein: the N is more than 2.

7. A method of operating a coherent optical multiplexed 1+1 protection device according to any one of claims 1 to 6, characterized by: it at least comprises one of the following components:

(1) the optical signal enters the multiplexing transmission unit of the N-path transit port through the multiplexing subunit of the N-path multiplexing/demultiplexing unit, then is coupled to enter the first optical splitter, and then is divided into two paths of optical signals by the first optical splitter and respectively enters the output units of the two paths of transmission ports for output;

(2) the optical signal is input through the input units of the two transmission ports, is selectively input into the second optical splitter by the optical switch, is divided into N paths by the second optical splitter, is respectively input into the demultiplexing transmission units of the N paths of transit ports, and is then correspondingly output into the demultiplexing subunits of the N paths of multiplexing/demultiplexing units.

Technical Field

The invention relates to the technical field of optical devices, in particular to a 1+1 protection device and a method for coherent light multiplexing.

Background

A conventional optical multiplex signal 1+1 protection scheme typically includes a signal port and two ports protected by 1+1, as shown in fig. 1 or fig. 2, which has a relatively high insertion loss and a problem that signal transmission quality cannot be stably ensured during multi-channel signal transmission.

Disclosure of Invention

In view of the situation of the prior art, the invention aims to provide a 1+1 protection method for coherent optical path multiplexing with good optical performance and low loss.

In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:

a 1+1 protection device for coherent optical multiplexing, comprising:

each path of multiplexing/demultiplexing unit comprises a multiplexing subunit and a demultiplexing subunit;

the N-path transit ports are in one-to-one correspondence with the N-path multiplexing/demultiplexing units and are connected with the N-path multiplexing/demultiplexing units, and each path of transit port comprises a multiplexing transmission unit and a demultiplexing transmission unit, wherein the multiplexing transmission unit is used for receiving signals transmitted by the multiplexing sub-units which are butted with the multiplexing transmission unit, and the demultiplexing transmission unit is used for transmitting the signals to the demultiplexing sub-units which are butted with the demultiplexing transmission unit;

two transmission ports, each transmission port comprising an output unit and an input unit;

the first optical splitter is an Nx 2 optical splitter and comprises N input ports and two output ports, wherein the N input ports of the first optical splitter are connected with the multiplexing transmission unit of the N-path transfer unit, and the two output ports of the first optical splitter are respectively connected with the output units of the two paths of transmission ports;

the optical switch is a 2 x 1 optical switch, is provided with two input interfaces and one output interface, and is respectively connected with the input units of the two transmission ports through the two input interfaces;

and the second optical splitter is a 1 XN optical splitter and is provided with an input port and N output ports, the input port of the second optical splitter is connected with the output interface of the optical switch, and the N output ports of the second optical splitter are respectively connected with the demultiplexing transmission unit of the N-path transit port.

As a possible implementation scheme, the optical switch further comprises a packaging shell, and the packaging shell is used for packaging the N-path transfer port, the two-path transmission port, the first optical splitter, the optical switch and the second optical splitter into an integrated structure.

As a possible implementation scheme, a first optical amplifier is further arranged between the optical switch and the second optical splitter.

As a possible implementation, further, a second optical amplifier is further disposed between the N output ports of the second optical splitter and the demultiplexing/transmission unit of the N-way transit port.

As a possible implementation, further, the multiplexing/demultiplexing unit is an AWG/AAWG module with filtering function, a WSS module, a cascaded TFF module, or a 1: N optical coupling module without filtering.

As a possible embodiment, further, N is 2 or more.

A method of operating a coherent optical multiplexed 1+1 protection device, comprising at least one of:

(1) the optical signal enters the multiplexing transmission unit of the N-path transit port through the multiplexing subunit of the N-path multiplexing/demultiplexing unit, then is coupled to enter the first optical splitter, and then is divided into two paths of optical signals by the first optical splitter and respectively enters the output units of the two paths of transmission ports for output;

(2) the optical signal is input through the input units of the two transmission ports, is selectively input into the second optical splitter by the optical switch, is divided into N paths by the second optical splitter, is respectively input into the demultiplexing transmission units of the N paths of transit ports, and is then correspondingly output into the demultiplexing subunits of the N paths of multiplexing/demultiplexing units.

Each unit of the multipath optical add-drop unit and the multipath optical add-drop unit of the scheme can support multiple wavelengths of combined and divided waves (through filtering or coupling). These wavelength division multiplexed signals are optically coupled and then shunted to the working and protection ports for a 1+1 transmit function. In the downlink direction, the wavelength division multiplexing signal of one of the working or protection paths is selected and then broadcast to a plurality of optical uplink and downlink units, so as to realize the selective receiving function of 1+1 optical protection.

The scheme integrates and combines a plurality of functional units, reduces optical loss, improves the number of ports of the uplink and the downlink, keeps good optical performance, and is suitable for the uplink and downlink application of high-speed high-order modulation coherent light with high performance requirements. The method is also suitable for the multiplex section line protection application of a coherent optical interface with lower transmitting power used by multiple add/drop units, such as a 400G ZR interface.

In the application of the upper path and the lower path of coherent wavelengths, the lower path of the multiplexing and demultiplexing unit does not need to filter each single wavelength, so that the spectrum utilization rate can be increased through an optical coupling mode.

In the optical path where multiple multiplexing units use the same filter in the drop, the optical protection unit can optionally use an optical amplifier to compensate for the loss of the protection and broadcast unit, thereby increasing the optical power at the drop wavelength to improve performance.

By adopting the technical scheme, compared with the prior art, the invention has the beneficial effects that: the scheme is a novel multi-wavelength signal 1+1 protection scheme for multiplexing, is suitable for multi-port add-drop functions of coherent light wavelength, and has small insertion loss, full spectrum width and multipath expansion; the typical optical add/drop direction of the scheme adopts an Nx 2 optical splitter, a plurality of add/drop ports and two paths of 1+1 protection ports, and the typical 2 x 2 scheme can reduce insertion loss more than 3dB than the traditional structure, and is suitable for an add/drop scheme of coherent optical band multiplexing section optical protection, the add/drop solution comprises a multiplexing and demultiplexing unit for providing the number of the add/drop ports to an Nx 2 coupling and demultiplexing unit for reducing the add loss and reducing the drop loss through integrated protection selection and optical branching and improving the system performance.

Drawings

The invention will be further explained with reference to the drawings and the detailed description below:

FIG. 1 is a schematic diagram of one of the prior art;

FIG. 2 is a schematic diagram of a second prior art;

FIG. 3 is a schematic view of embodiment 1 of the present invention;

FIG. 4 is a schematic view of embodiment 2 of the present invention;

FIG. 5 is a schematic view of embodiment 3 of the present invention;

fig. 6 is a schematic diagram of embodiment 4 of the present invention.

Detailed Description

Example 1

As shown in fig. 3, the 1+1 protection device for coherent optical multiplexing of the present embodiment includes:

the multiplexing/demultiplexing unit 1 of 2 routes, each route of multiplexing/demultiplexing unit includes a multiplexing subunit 11 and a demultiplexing subunit 12;

the 2-path transit ports 2 are in one-to-one correspondence with the N-path multiplexing/demultiplexing units 1 and connected, and each path of transit port 2 comprises a multiplexing transmission unit 21 and a demultiplexing transmission unit 22, wherein the multiplexing transmission unit 21 is used for receiving signals transmitted by the multiplexing sub-units connected with the multiplexing transmission unit 11, and the demultiplexing transmission unit 22 is used for transmitting the signals to the demultiplexing sub-units 12 connected with the demultiplexing transmission unit;

two transmission ports 3, each of which includes an output unit 31 and an input unit 32;

the first optical splitter 4 is a 2 × 2 optical splitter and includes two input ports and two output ports, wherein N input ports of the first optical splitter 4 are connected to the multiplexing transmission unit 21 of the 2-way relay unit 2, and two output ports of the first optical splitter 4 are respectively connected to the output units 31 of the two-way transmission port 3;

the optical switch 5 is a 2 × 1 optical switch, has two input interfaces and one output interface, and is connected to the input units 32 of the two transmission ports 3 through the two input interfaces respectively;

the second optical splitter 6 is a 1 × 2 optical splitter, and has one input port and two output ports, the input port of the second optical splitter 6 is connected to the output interface of the optical switch 5, and 2 output ports of the second optical splitter 6 are respectively connected to the demultiplexing transmission unit 22 of the N-way transit port 2.

As a possible implementation scheme, the optical switch further includes a packaging casing for packaging the 2-way relay port 2, the two-way transmission port 3, the first optical splitter 4, the optical switch 5, and the second optical splitter 6 into an integrated structure.

In addition, as a possible implementation, further, the multiplexing/demultiplexing unit 1 may be an AWG/AAWG module with filtering function, a WSS module, a cascaded TFF module, or a 1: N optical coupling module without filtering.

The operation method of the coherent light multiplexing 1+1 protection device at least comprises one of the following steps:

(1) the optical signal enters the multiplexing transmission unit 21 of the N-path transit 2 port through the multiplexing subunit 11 of the 2-path multiplexing/demultiplexing unit 1, then is coupled into the first optical splitter 4, and then is divided into two paths by the first optical splitter 4 and enters the output units 31 of the two paths of transmission ports 3 respectively for output;

(2) the optical signal is input through the input unit 32 of the two transmission ports 3, and is selectively input into the second optical splitter 6 by the optical switch 5, the input optical signal is split into 2 paths by the second optical splitter 6, and is respectively input into the demultiplexing transmission units 22 of the 2 paths of transit ports, and then is correspondingly output into the demultiplexing subunits 12 of the 2 paths of multiplexing/demultiplexing units 1.

Example 2

As shown in fig. 4, this embodiment is substantially the same as embodiment 1, except that: as a possible implementation, a first optical amplifier is further disposed between the optical switch 5 and the second optical splitter 6.

The 2-path multiplexing/demultiplexing units 1, 2-path transit ports 2, two-path transmission ports 3, the first optical splitter 4, the optical switch 5 and the second optical splitter 6 in the embodiment are the same as those in embodiment 1.

Example 3

As shown in fig. 5, this embodiment is substantially the same as embodiment 1, except that: a second optical amplifier 8 is further disposed between the 2 output ports of the second optical splitter 6 and the demultiplexing/transmission unit 22 of the 2-way transit port 2.

The 2-path multiplexing/demultiplexing units 1, 2-path transit ports 2, two-path transmission ports 3, the first optical splitter 4, the optical switch 5 and the second optical splitter 6 in the embodiment are the same as those in embodiment 1.

Example 4

As shown in fig. 6, this embodiment is substantially the same as embodiment 1, except that: n in this embodiment is greater than 2.

The N-way multiplexing/demultiplexing unit 1, the N-way transit port 2, the two-way transmission port 3, the first optical splitter 4, the optical switch 5, and the second optical splitter 6 of the present embodiment are substantially the same as those of embodiment 1, and are different in that the number of corresponding ports is different.

The foregoing is directed to embodiments of the present invention, and equivalents, modifications, substitutions and variations such as will occur to those skilled in the art, which fall within the scope and spirit of the appended claims.