Abstract: An optical transmission system comprises an optical transmitter (1) for launching optical signals into an optical fibre, and drive means (4 to 9) for driving the optical transmitter independently with first and second electrical signals. The drive means is such that the optical transmitter (1) transmits first and second optical signals corresponding to the first and second electrical signals.
Type:
Grant
Filed:
October 1, 1991
Date of Patent:
December 19, 1995
Assignee:
British Telecommunications public limited company