Optical transmission/reception system and optical transmission/reception method

Patent metadata

Field	Value
Publication number	US-2024223921-A1
Application number	US-202118289174-A
Country	US
Kind code	A1
Filing date	May 10, 2021
Priority date	May 10, 2021
Publication date	Jul 4, 2024
Grant date	—

Abstract

In an optical transmitter ( 10 a ), an error correction and coding unit ( 11 ) performs error correction and coding on data. A framer unit ( 13 ) adds header information to n pieces of error-corrected and coded data to generate a frame signal (Fm). A frame dividing unit ( 14 ) divides the data of the frame signal into n pieces D 1 to Dn, 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 ( 5 t 1 to 5 tn ) convert the n frame signals into optical signals of different wavelengths and transmit them to n optical transmission paths ( 17 a to 17 n ). Optical reception units ( 9 r 1 to 9 rn ) of an optical receiver ( 10 b ) receive n optical signals and convert them into n frame signals of electrical signals. A frame synthesizing unit ( 20 ) determines whether at least one of the n frame signals has an correct CRC value without an error.

First claim

1 . An optical transmission/reception system comprising: an optical transmitter having n optical transmission units which transmit optical signals; and an optical receiver having n optical reception units which are connected to the n optical transmission units via optical transmission paths and receive the n optical signals transmitted via the optical transmission paths,
wherein the optical transmitter includes a frame division unit which divides data of a first frame signal framed by adding header information to data into n pieces, replicates the header information by the number of the n divisions, adds the replicated header information to head of each piece of n-divided data, adds different cyclic redundancy check (CRC) values to end of each data to form a frame, and generates n frame signals that are framed electrical signals, the n optical transmission units 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 receive the optical signals of n wavelengths from the optical transmission paths and convert the optical signals into n frame signals of electrical signals, and the optical receiver includes a frame synthesizing unit which determines 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, synthesizes 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.

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 which multiplexes n optical signals of different wavelengths from the n optical transmission units, the optical receiver includes an optical demultiplexing unit that demultiplexes 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 which performs error correction and coding on data from the optical transmission path, and a framer unit which adds header information to the error correction-encoded data to form a frame, and outputs the framed data to the frame division unit, and the optical receiver includes a deframer unit which outputs 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 which performs 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 instructs that the entire frame signal should 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 which transmit optical signals; and an optical receiver having n optical reception units which are connected to the n optical transmission units through n optical transmission paths and receive the n optical signals transmitted via the optical transmission paths,
wherein the optical transmission paths have the same length, the optical transmitter executes a step of 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 a step of 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 a step of 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 a step of 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.

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 executes a step of 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 executes a step of 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 executes a step of outputting data obtained by synthesizing n pieces of data after removing header information from the generated second frame signal, and
a step of performing error correction and decoding on the output data.

Assignees

• Nippon Telegraph & Telephone

Inventors

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

Classifications

• H04L1/0061

  Error detection codes · CPC title

• H04Q11/0003 Primary

  Details · 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