Patent ID: 7113703

Claim:
An optical transmission system comprising a transmitting-end optical transmission device, a receiving-end optical transmission device and an optical transmission line connecting the transmitting-end and receiving-end optical transmission devices, the transmitting-end optical transmission device comprising: encoding means having k input and n output, for generating (n−k) error correction bits for transmission data on k channels and adding the (n−k) error correction bits to the transmission data so as to form a sequence of n data; multiplexing and frame generating means connected to the encoding means, for adding a frame synchronization information to each data in the sequence of the n data and time-division-multiplexing the n data; and electrical-optical converting means connected to the multiplexing and frame generating means, for converting the time-division-multiplexed n data into n optical signals so as to deliver the n optical signals to the optical transmission line, and the receiving-end optical transmission device comprising: optical-electrical converting means for converting the n optical signals via the optical transmission line to electrical signals; separating means connected to the optical-electrical converting means, for separating the electrical signals into a sequence of n data by detecting the frame synchronization information; and decoding means connected to the separating means, for performing error correction decoding for a sequence of k data from said separated sequence of the n data using a sequence of (n−k) data from said separated sequence of the n data.