Optical transmission/reception system and optical transmission/reception method

Patent metadata

Field	Value
Publication number	US-12598405-B2
Application number	US-202118289174-A
Country	US
Kind code	B2
Filing date	May 10, 2021
Priority date	May 10, 2021
Publication date	Apr 7, 2026
Grant date	Apr 7, 2026

Abstract

In an optical transmitter, an error correction and coding unit performs error correction and coding on data. A framer unit adds header information to n pieces of error-corrected and coded data to generate a frame signal. A frame dividing unit divides the data of the frame signal into n pieces, adds the header information to head of each of the n pieces of divided data, and generates n frame signals obtained by adding different CRC values to end. Optical transmission units convert the n frame signals into optical signals of different wavelengths and transmit them to n optical transmission paths. Optical reception units of an optical receiver receive n optical signals and convert them into n frame signals of electrical signals. A frame synthesizing unit determines whether at least one of the n frame signals has an correct CRC value without an error.

First claim

The invention claimed is:

1 . An optical transmission/reception system comprising: an optical transmitter having n optical transmission units configured to transmit optical signals; and an optical receiver having n optical reception units that are connected to the n optical transmission units via optical transmission paths and configured to receive the n optical signals transmitted via the optical transmission paths,
wherein the optical transmitter includes a frame division unit configured to divide data of a first frame signal framed by adding header information to data into n pieces, replicate the header information by the number of the n divisions, add the replicated header information to head of each piece of n-divided data, add different cyclic redundancy check (CRC) values to end of each data to form a frame, and generate n frame signals that are framed electrical signals, the n optical transmission units are configured to convert each of the n frame signals into optical signals having different wavelengths and transmit the optical signals to the optical transmission path, the n optical reception units are configured to receive the optical signals of n wavelengths from the optical transmission paths and convert the optical signals into n frame signals of electrical signals, the optical receiver includes a frame synthesizing unit configured to determine whether there is a correct CRC value without errors in at least one of the converted n frame signals, and when it is determined that at least one CRC value is correct without errors, the frame synthesizing unit is further configured to synthesize n pieces of data of all the n frame signals with header information of the frame signal of the correct CRC value to generate a second frame signal, and wherein n is a positive integer.

2 . The optical transmission/reception system according to claim 1 ,
wherein the number of the optical transmission paths is n, and the optical transmission paths have the same length.

3 . The optical transmission/reception system according to claim 1 ,
wherein the optical transmitter further includes an optical multiplexing unit configured to multiplex n optical signals of different wavelengths from the n optical transmission units, the optical receiver includes an optical demultiplexing unit configured to demultiplex the multiplexed n optical signals, and in place of the optical transmission path, the optical multiplexing unit and the optical demultiplexing unit are connected by one optical transmission path.

4 . The optical transmission/reception system according to claim 1 , wherein the optical transmitter includes
an error correction and coding unit configured to perform error correction and coding on data from the optical transmission path, and a framer unit configured to add header information to the error correction-encoded data to form a frame, and output the framed data to the frame division unit, and the optical receiver includes a deframer unit configured to output data obtained by synthesizing n pieces of data after removing header information from the second frame signal generated by the frame synthesizing unit, and an error correction and decoding unit configured to perform error correction and decoding on the data output from the deframer unit.

5 . The optical transmission/reception system according to claim 1 ,
wherein the frame synthesizing unit is configured to instruct the entire frame signal to be re-transmitted when all CRC values have errors.

6 . An optical transmission/reception method of an optical transceiver system comprising: an optical transmitter having n optical transmission units configured to transmit optical signals; and an optical receiver having n optical reception units that are connected to the n optical transmission units through n optical transmission paths and are configured to receive the n optical signals transmitted via the optical transmission paths,
wherein the optical transmission paths have the same length, the optical transmitter is configured to perform operations comprising dividing data of a first frame signal framed by adding header information to data into n pieces, replicating the header information by the number of the n divisions, adding the replicated header information to head of each piece of n-divided data, adding different cyclic redundancy check (CRC) values to end of each data to form a frame, and generating n frame signals that are framed electrical signals, and converting each of the n frame signals into optical signals having different wavelengths and transmitting the optical signals to the n optical transmission paths, and the optical receiver executes receiving the optical signals of n wavelengths from the n optical transmission paths and converting the optical signals into n frame signals of electrical signals, and determining whether there is a correct CRC value without errors in at least one of the converted n frame signals, and when it is determined that at least one CRC value is correct without errors, synthesizing n pieces of data of all the n frame signals with header information of the frame signal of the correct CRC value to generate a second frame signal, and wherein n is a positive integer.

7 . The optical transmission/reception method according to claim 6 ,
wherein the optical transmitter and the optical receiver are connected by one optical transmission path instead of the n optical transmission paths, the optical transmitter is further configured to perform operations comprising multiplexing optical signals of n wavelengths obtained by converting each of the n frame signals into optical signals of different wavelengths, and transmitting the multiplexed signal to the one optical transmission path, and the optical receiver is configured to perform operations comprising demultiplexing the multiplexed signal from the one optical transmission path into optical signals of n wavelengths.

8 . The optical transmission/reception method according to claim 6 , wherein the optical receiver is further configured to perform operations comprising
outputting data obtained by synthesizing n pieces of data after removing header information from the generated second frame signal, and performing error correction and decoding on the output data.

Assignees

• Ntt Inc

Inventors

• Matsuda Toshiya
• Nakagawa Masahiro
• Masumoto Kana
• Nishiyama Kota

Classifications

• H04L1/0061

  Error detection codes · CPC title

• H04L1/00

  Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)} · CPC title

• H04L1/16

  in which the return channel carries supervisory signals, e.g. repetition request signals · CPC title

• H04Q11/0003 Primary

  Details · CPC title