Error-correction multiplexing apparatus, error-correction demultiplexing apparatus, optical transmission system using them, and error-correction multiplexing transmission method

An error correction demultiplexer comprising:

• a demultiplexer that demultiplexes first serial data stream into first parallel data stream, wherein the first serial data stream is multiplexed with a plurality of error correcting codes, and each error correcting code is calculated from data in different direction of a matrix formed by second parallel data stream;
• a decoder that decodes the first parallel data stream into third parallel data stream based on the error correcting codes;
• and
• a multiplexer that multiplexes the third parallel data stream into second serial data stream, and outputs the second serial data stream.

An optical transmission system comprising:

• a first optical receiver that converts first optical signals into electrical signals to generate first serial data stream;
• an error correction multiplexer that includes
• a first demultiplexer that demultiplexes the first serial data stream into first parallel data stream constituting a matrix;
• a first encoder that calculates a first error correcting code from data in a first direction of the matrix, and adds the first error correcting code to the first parallel data stream;
• a second encoder that calculates a second error correcting code from data in a second direction of the matrix, and adds the second error correcting code to the first parallel data stream;
• and
• a first multiplexer that multiplexes the first parallel data stream that is error-correction-coded based on the first error correcting code and the second error correcting code into second serial data stream, and outputs the second serial data stream;
• a first optical transmitter that converts the second serial data stream into second optical signals;
• an optical transmission line to transmit the second optical signals;
• a second optical receiver that converts the second optical signals input through the optical transmission line into electrical signals to generate third serial data stream;
• an error correction demultiplexer that includes
• a second demultiplexer that demultiplexes the third serial data stream into second parallel data stream;
• a decoder that decodes the second parallel data stream into third parallel data stream based on the error correcting codes;
• and
• a second multiplexer that multiplexes the third parallel data stream into fourth serial data stream, and outputs the fourth serial data stream;
• and
• a second optical transmitter that converts the fourth serial data stream into third optical signals.

A method of error correction multiplexing transmission comprising:

• demultiplexing first serial data stream into first parallel data stream constituting a first matrix;
• calculating a first error correcting code from data in a first direction of the matrix;
• adding the first error correcting code to the first parallel data stream;
• calculating a second error correcting code from data in a second direction of the matrix;
• adding the second error correcting code to the first parallel data stream;
• and
• multiplexing the first parallel data stream into second serial data stream.