Patent ID: 7983564

Claim:
A transmission system for transmitting a first optical signal modulated by a first transmitter and a second optical signal modulated by a second transmitter through a same transmission line, the first optical signal being modulated by phase modulation, and the second optical signal being modulated by intensity modulation, the transmission system comprising: a wavelength division multiplexing unit for generating a multiplexed optical signal obtained by multiplexing the first optical signal and the second optical signal by wavelength division multiplexing; and a dispersion compensating unit for adjusting an amount of dispersion compensation of the multiplexed optical signal so that an absolute value of an amount of residual dispersion per span generated in the multiplexed optical signal is a threshold or more in transmitting the multiplexed optical signal through the transmission line, and wherein the amount of dispersion compensation adjusted based on a time slot in which the second transmitter transmits the second optical signal, and a wavelength interval between the first optical signal and the second optical signal which are multiplexed at the wavelength division multiplexing unit.