WO2012051847A1

WO2012051847A1 - Method and system for delay line interference adjustment in 100g optical communication system

Info

Publication number: WO2012051847A1
Application number: PCT/CN2011/073835
Authority: WO
Inventors: 康凯; 沈百林
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-10-21
Filing date: 2011-05-09
Publication date: 2012-04-26
Also published as: CN101997634A; CN101997634B

Abstract

The present invention discloses a method and system for delay line interference adjustment in the 100G optical communication system. The method includes the following steps: dividing 20 logical channels which are bearing Optical Transport Unit 4 (OTU4) service and are processed by a framer into multi-paths which correspond to a plurality of receivers of the 100G optical communication system respectively; judging whether each path generates a warning signal or not; and if the path generates a warning signal, performing the delay line interference adjustment according to the indication of the warning signal by the receiver corresponding to the path which generates the warning signal. By the above technical solutions, the delay line interference adjustment of the 100G optical communication system is realized.

Description

Method and system for delay line interference adjustment of 100G optical communication system

The present invention relates to the field of wavelength division transmission technologies, and in particular, to a method and system for delay line interference adjustment of a 100G optical communication system. Background technique

With the rapid growth of the bandwidth demand of the bearer network, 100G has gradually become the future development direction. For the 100G OTN (Optical Transport Network) standard, ITUT has developed an ODU4/OTU4 related package definition for the DSO/wavelength conversion unit OTU. The OTU4 rate is approximately 112 Gb/s, which cannot be processed by the electrical device. At such a high rate, the code rate can be reduced to 1/4 of the total signal rate by combining multiple wavelengths, multi-level modulation, multi-polarization multiplexing, and the like. At present, the 100G line side optical module generally adopts a non-coherent modulation scheme. When using a non-coherent modulation scheme, the two subcarriers are separated by 50 GHz, the single wave rate is 56 Gb/s, and each subcarrier signal phase shift keying is modulated, and the actual code is used. The rate is 28 G baud.

The DQPSK modulation module needs to perform delay line interference DLI adjustment. The difference between the line side optical module in the 100G optical communication system and the delay line interference adjustment of the 40G single wavelength optical module in the prior art is: 40G optical communication system single wavelength optical module only The framer needs to provide an LOF (loss of frame) alarm signal as an indication to implement delay line interference adjustment of the optical module, and the line side optical module in the 100G optical communication system includes multiple receivers, and the existing In the technology, the method of delay line interference adjustment of the 40G optical communication system cannot be applied to the adjustment of the delay line interference of the line side optical module of the 100G optical communication system. Summary of the invention

The invention provides a method and a system for delay line interference adjustment of a 100G optical communication system, and realizes delay line interference adjustment of a 100G optical communication system.

In order to solve the above technical problems, the present invention uses the following technical solutions:

A method for delay line interference adjustment of a 100G optical communication system, the method comprising: dividing, by a framer, 20 logical channels carrying OTU4 services into multiple channels corresponding to multiple receivers of the 100G optical communication system;

Determining whether each channel generates an alarm signal, such as generating an alarm signal, the receiver corresponding to one of the roads generating the alarm signal performs delay line interference adjustment according to the indication of the alarm signal.

The plurality of receivers of the 100G optical communication system include two receivers, and the 20 logical channels carrying the OTU4 service processed by the framer are divided into two paths corresponding to the two receivers respectively, the two Each path in the road includes 10 logical channels.

Determining whether each channel generates an alarm signal, such as generating an alarm signal, and the method corresponding to the receiver corresponding to the one that generates the alarm signal to perform delay line interference adjustment according to the indication of the alarm signal includes:

Each frame of each logical channel is framed;

Determine whether each logical channel of each path finds a frame header;

For each way, if there is a logical channel that does not find the frame header, then the path generates a frame loss LOF alarm signal;

Generating Frame Loss The receiver corresponding to one of the LOF alarm signals performs delay line interference adjustment based on the indication of the frame loss LOF alarm signal.

Determining whether each channel generates an alarm signal, for example, generating an alarm signal, and the method corresponding to the receiver corresponding to the one that generates the alarm signal to perform delay line interference adjustment according to the indication of the alarm signal further includes:

For each way, if each logical channel finds a frame header, then the logic that passes the path The logical channel identifier LLM of the channel determines whether the two optical paths of the I and Q carried by the path are orthogonal; if not, the path generates an OLA (Out of Lane Alignment) alarm signal;

Channel alignment failure occurs. The receiver corresponding to one channel of the OLA alarm signal performs delay line interference adjustment according to the indication of the channel alignment failure OLA alarm signal.

If the logical channel identification LLM of each logical channel of the path determines that the I and Q optical paths of the path are the same or have a phase difference of 180. Then, the receiver corresponding to the path adjusts the I or Q phase shift of the interference of the delay line according to the indication of the channel alignment failure OLA alarm signal generated by the path. .

A system for delay line interference adjustment of a 100G optical communication system, comprising a logical channel grouping module, a signal judging module, and a plurality of receivers, wherein:

The logical channel grouping module is configured to divide 20 logical channels carrying the OTU4 service processed by the framer into multiple channels corresponding to the plurality of receivers of the 100G optical communication system;

The signal judging module is configured to determine whether each channel generates an alarm signal, such as generating an alarm signal, where the alarm signal is used to indicate that the receiver corresponding to the path that generates the alarm signal implements delay line interference adjustment;

The plurality of receivers are respectively configured to perform delay line interference adjustment according to an indication of an alarm signal generated by the corresponding path.

The plurality of receivers comprise two receivers, and the logical channel grouping module is configured to divide the 20 logical channels carrying the OTU4 service processed by the framer into two paths corresponding to the two receivers respectively.

The signal judging module is configured to: respectively frame each logical channel of each path to determine whether each logical channel of each path finds a frame header, and for each path, if a logical channel does not find a frame header, the path is generated. The frame loses the LOF alarm signal, and the frame loss LOF alarm signal is used to indicate that the receiver corresponding to the path that generates the frame loss LOF alarm signal implements delay line interference adjustment. The signal judging module is further configured to: if each of the logical channels finds a frame header, the logical channel identifier LLM of each logical channel of the path determines whether the optical paths of the I and Q of the path are orthogonal, if no Then, the channel generates a channel alignment failure OLA alarm signal, and the channel alignment failure OLA alarm signal is used to indicate that the receiver corresponding to the channel that generates the channel alignment failure OLA alarm signal implements delay line interference adjustment.

If the signal judging module judges that the I and Q optical paths of the path are the same or different by 180° through the logical channel identification LLM of each logical channel of the path, the channel corresponding to the path corresponding to the path is faulty. The indication of the alarm signal adjusts the I or Q phase shift of the delay line interference by 90. .

The invention provides a method and a system for delay line interference adjustment of a 100G optical communication system. The method divides 20 logical channels of an OTU4 service carrying a 100G optical communication system processed by a framer into multiple receivers of a 100G optical communication system. Corresponding multiple channels determine whether each channel generates an alarm signal. If an alarm signal is generated, the receiver corresponding to the one that generates the alarm signal performs delay line interference adjustment according to the alarm signal, and solves the delay line interference adjustment of the 100G optical communication system. The problem. DRAWINGS

1 is a schematic diagram of generating an alarm signal according to an embodiment of the present invention;

2 is a flowchart of generating an LOF alarm signal and an OLA alarm signal according to an embodiment of the present invention; FIG. 3 is a flowchart of adjusting delay line interference according to an OLA alarm signal according to an embodiment of the present invention; FIG. 4 is an OLA alarm according to another embodiment of the present invention; A flow chart for signal adjustment delay line interference. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings.

Embodiment 1: In this embodiment, the 20 logical channels carrying the OTU4 service processed by the framer of the 100G optical communication system are divided into two paths corresponding to the two receivers of the 100G optical communication system, and each path includes 10 logical channels.

FIG. 1 is a schematic diagram of generating an alarm signal according to an embodiment of the present invention, as shown in FIG. 1:

The line side optical module of the 100G optical communication system divides the received four optical signals of the OTU4 service into two sets of inputs, which are an RZ-DQPSK(x) receiver and an RZ-DQPSK(y) receiver, respectively. One receiver receives two optical signals of I and Q, and each receiver converts the two I and Q optical signals received by the receiver into two electrical signals by photoelectric conversion, and four of them are converted into two by two receivers. The electrical signal is then processed by the 4:10 DEMUX demultiplexing module, converted into 10 electrical signals, and input to the framer. The framer divides the 10 electrical signals into 20 logical channels according to the optical transport network OTN protocol. The 20 logical channels refer to 20 logical channels that carry the OTU4 service processed by the framer;

The logical channel grouping module in the framer divides the 0-9 channels of 20 logical channels into a group to represent the X channel, and the 10-19 channels are divided into a group to represent the y channel, and the signal judging module separately performs the X channel and the y channel. Judging, determining whether each channel generates an alarm signal, such as generating an alarm signal, and the receiver corresponding to the road generating the alarm signal implements delay line interference adjustment according to the indication of the alarm signal, that is, if the X channel generates an alarm signal, the X channel The generated alarm signal is used to indicate the delay line interference adjustment of the RZ-DQPSK(x) receiver. If the y way generates an alarm signal, the alarm signal generated by the y channel is used to indicate the delay line interference of the RZ-DQPSK(y) receiver. Adjustment.

2 is a flow chart of generating a LOF signal and an OLA signal according to an embodiment of the present invention, as shown in FIG. 2:

Step 201: Determine 10 logical channels of each of the X road and the y road, respectively, and determine whether each of the 10 logical channels finds a frame header;

Step 202: If the X path has a logical channel and no frame header is found, the X path generates an LOF_x signal; if the y path has a logical channel and no frame header is found, the y path generates an LOF_y signal; Step 203: The LOF_x signal is used to indicate that the RZ-DQPSK(x) receiver of the line side optical module performs delay line interference adjustment; the LOF_y signal is used to indicate the delay line of the RZ-DQPSK(y) receiver of the line side optical module. Interference adjustment.

Step 204: If the logical path of each X channel is found, the logical channel identification LLM of each logical channel of the X channel determines whether the I and Q optical paths of the X path are orthogonal; if each logical channel of the y channel finds the frame header And determining, by the logical channel identifier LLM of each logical channel of the y way, whether the two optical paths of the y road are orthogonal;

Step 205: If the I and Q optical paths of the X path are not orthogonal, the X path generates an OLA_x signal; if the I and Q paths of the y path are not orthogonal, the y path generates an OLA_y signal;

Step 206: The OLA_x signal is used to indicate delay line interference adjustment of the RZ-DQPSK(x) receiver of the line side optical module; the OLA_y signal is used to indicate the delay line of the RZ-DQPSK(y) receiver of the line side optical module. Interference adjustment.

This embodiment solves the problem of the delay line interference adjustment indication signal generated by the 100G optical communication system.

Embodiment 2:

FIG. 3 is a flowchart of adjusting delay line interference according to an OLA signal according to an embodiment of the present invention, as shown in FIG. 3:

In this embodiment, the implementation 1 is performed. Further, if the logical channel identification LLM of each logical channel of each channel determines that the I and Q optical paths of each path are the same, the OLA alarm signal is generated by the path, and the OLA alarm signal is generated. The corresponding receiver adjusts the I or Q phase shift of the delay line interference by 90° according to the indication of the OLA alarm signal. The flow is as follows:

Step 301, starting detection;

Step 302: Detect whether there are 0, 1, 2, 3, 4, and 0, 1, 2, 3, and 4 repetitions of the logical channel identifier LLM of the 10 logical channels of the X path. If yes, execute step 303. If no, Then performing step 304; Step 303, generating an OLA_x alarm signal, and the RZ-DQPSK(x) receiver adjusts the I or Q phase shift of the delay line interference by 90°;

Step 304: Detect whether there are 5, 6, 7, 8, 9, and 5, 6, 7, 8, and 9 repetitions of the logical channel identifier LLM of the 10 logical channels of the X path. If yes, execute step 305. If no, Then perform step 306;

Step 305: Generate an OLA_x alarm signal, and the RZ-DQPSK(x) receiver adjusts the delay line interference I or Q phase shift by 90°;

Step 306: Detect whether there are 10, 11, 12, 13, 14, and 10, 11, 12, 13, and 14 LLMs of the 10 logical channels of the y channel. If yes, execute step 307. If no, perform steps. 308;

Step 307: Generate an OLA_y alarm signal, and the RZ-DQPSK(y) receiver adjusts the I or Q phase shift 90 of the delay line interference according to the OLA_y alarm signal. ;

Step 308: Detect whether there are 15, 16, 17, 18, 19, and 15, 16, 17, 18, 19 repetitions of the LLMs of the 10 logical channels of the y way. If yes, execute step 309. If no, perform steps. 310;

Step 309: Generate an OLA_y alarm signal, and the RZ-DQPSK(y) receiver adjusts the I or Q phase shift 90 of the delay line interference according to the OLA_y alarm signal. ;

Step 310, end.

4 is a flow chart of adjusting delay line interference according to an OLA signal according to another embodiment of the present invention. As shown in FIG. 4, the implementation 1 is performed. Further, if each channel I is determined by the logical channel identifier LLM of each logical channel of each path. The phase difference between the two optical paths and Q is 180. Then, the path generates an OLA alarm signal, and the receiver corresponding to the path generating the OLA alarm signal adjusts the I or Q phase shift 90 of the delay line interference according to the indication of the OLA alarm signal. , the process is as follows:

Step 401, start detecting;

Step 402: Detect whether the logical channel identifier LLM of the 10 logical channels of the X path has 0, 1, 2, 3, 4 and 11, 12, 13, 14, 15 , if yes, step 403 is performed, if no, step 404 is performed;

Step 403: Generate an OLA_x alarm signal, and the RZ-DQPSK(x) receiver adjusts the delay line interference I or Q phase shift by 90°;

Step 404: Detect a logical channel identifier of the 10 logical channels of the X path, and the LLM is present.

6, 7, 8, 9, and 6, 7, 8, 9, 10, if yes, step 405 is performed, if no, step 406 is performed;

Step 405: Generate an OLA_x alarm signal, and the RZ-DQPSK(x) receiver adjusts the delay line interference I or Q phase shift by 90°;

Step 406: Detect whether there are 1, 2, 3, 4, 5, and 10, 11, 12, 13, and 14 LLMs of the 10 logical channels of the y way. If yes, execute step 407. If no, perform step 408. ;

Step 407: Generate an OLA_y alarm signal, and the RZ-DQPSK(y) receiver adjusts the I or Q phase shift 90 of the delay line interference according to the OLA_y alarm signal. ;

Step 408: Detect whether the LLMs of the 10 logical channels of the y channel exist 15, 16, 17,

18, 19 and 0, 16, 17, 18, 19, if yes, step 409 is performed, if no, step 410 is performed;

Step 409: Generate an OLA_y alarm signal, and the RZ-DQPSK(y) receiver adjusts the I or Q phase shift 90 of the delay line interference according to the OLA_y alarm signal. ;

Step 410, end.

The delay line interference adjustment according to the indication of the LOF alarm signal refers to the prior art.

The present invention is not limited to two receivers of the line side optical module of the 100G optical communication system. When the line side optical module of the 100G optical communication system includes multiple receivers, the 20 logical channels carrying the OTU4 service processed by the framer can be divided into The multiple receivers of the 100G optical communication system respectively correspond to multiple channels, and determine whether each channel generates an alarm signal. If an alarm signal is generated, an alarm is generated. The receiver corresponding to one of the signals performs delay line interference adjustment according to the alarm signal. For example, when the line side optical module of the 100G optical communication system includes an even number of receivers such as 4, 6, 8, 10, etc., the corresponding framer is processed. The 20 logical channels carrying the OTU4 service are equally divided into 4, 6, 8, 10, etc., to determine whether each channel generates an alarm signal. If an alarm signal is generated, the receiver corresponding to the one that generates the alarm signal performs according to the alarm signal. Delay line interference adjustment. A system for delay line interference adjustment of a 100G optical communication system, including a logical channel grouping module, a signal judging module, a plurality of receivers, the logical channel grouping module and/or the signal judging module are not limited to the present invention. In the foregoing embodiment, the logical channel grouping module and/or the signal judging module are not limited to the above embodiment of the present invention, and are disposed in a framer of a 100G optical communication system, and may be disposed in other modules of the 100G optical communication system, and The framer establishes a signal transmission link.

The above is a further detailed description of the present invention in connection with the specific embodiments, and the specific embodiments of the present invention are not limited to the description. It is to be understood by those skilled in the art that the present invention may be practiced without departing from the spirit and scope of the invention.

Claims

Claim

A method for delay line interference adjustment of a 100G optical communication system, characterized in that the method comprises:

The 20 logical channels carrying the OTU4 service processed by the framer are divided into multiple channels corresponding to the plurality of receivers of the 100G optical communication system respectively;

2. The method according to claim 1, wherein the plurality of receivers of the 100G optical communication system comprise two receivers, and the 20 logical channels carrying the OTU4 service processed by the framer are divided into Two receivers respectively correspond to two paths, and each of the two channels includes 10 logical channels.

The method according to claim 1 or 2, wherein, determining whether each channel generates an alarm signal, such as generating an alarm signal, the receiver corresponding to one way generating the alarm signal performs delay line interference according to the indication of the alarm signal The methods of adjustment include:

Each frame of each logical channel is framed;

Determine whether each logical channel of each path finds a frame header;

4. The method according to claim 3, wherein, determining whether each channel generates an alarm signal, such as generating an alarm signal, the receiver corresponding to one way generating the alarm signal performs delay line interference adjustment according to the indication of the alarm signal. The method also includes:

For each path, if each of the logical channels finds a frame header, the logical channel identification LLM of each logical channel of the path determines whether the optical paths of the I and Q of the path are orthogonal; If no, the channel generates a channel alignment failure OLA alarm signal;

5. The method according to claim 4, wherein if the logical channel identification LLM of each logical channel of the path determines that the I and Q optical paths of the path are the same or different by 180°, the corresponding reception of the path The machine adjusts the I or Q phase shift of the delay line interference by 90° according to the indication of the channel alignment failure OLA alarm signal generated by the path.

6. A system for delay line interference adjustment of a 100G optical communication system, comprising: a logical channel grouping module, a signal judging module, and a plurality of receivers, wherein:

The logical channel grouping module is configured to divide the 20 logical channels carrying the OTU4 service processed by the framer into multiple channels corresponding to the plurality of receivers of the 100G optical communication system;

The plurality of receivers respectively perform delay line interference adjustment based on an indication of an alarm signal generated by the corresponding path.

7. The system of claim 6, wherein the plurality of receivers comprise two receivers, the logical channel grouping module dividing the 20 logical channels of the framer processed OTU4 service into and Two channels corresponding to the two receivers are respectively described.

8. The system according to claim 6 or 7, wherein the signal judging module respectively frames each logical channel of each path to determine whether each logical channel of each path finds a frame header, and for each path, if If there is a logical channel, the frame header is not found, and the path generates a frame loss LOF alarm signal, and the frame loss LOF alarm signal indicates that the receiver corresponding to the path that generates the frame loss LOF alarm signal implements delay line interference adjustment.

9. The system according to claim 8, wherein the signal determining module is further configured to perform: For each path, if each logical channel finds a frame header, the logical channel identification LLM of each logical channel of the path determines whether the I and Q optical paths of the path are orthogonal. If not, the path generates channel alignment failure OLA. The alarm signal, the channel alignment failure OLA alarm signal indicates that the receiver corresponding to the path that generates the channel alignment failure OLA alarm signal implements delay line interference adjustment.

10. The system according to claim 9, wherein, if the signal judging module judges that the two optical paths of the I and Q of the path are the same or different by 180° through the logical channel identification LLM of each logical channel of the path, the road station The corresponding receiver adjusts the I or Q phase shift 90 of the delay line interference based on the indication of the channel alignment failure OLA alarm signal generated by the path. .