Addition manner null of the channel in the wavelength division multiplex transmission system, and this wavelength division multiplex transmission

摘要

PROBLEM TO BE SOLVED: To provide a wavelength division multiplex transmission system where a level of an output side is not affected with a wavelength even when optical signals with different wavelengths are multiplexed.;SOLUTION: An optical multiplexer 17 multiplexes control lights J1, J2,..., J8 with multiplex signal lights F1, F2,..., F8 and outputs a multiplexed signal light K. In this case, optical demultiplexers 131, 132,..., 138, light receiving sections 141, 142,..., 148, level control section 151, 152,..., 158, and control light generating sections 161, 162,..., 168, adjust power of the control lights J1, J2,..., J8 with a complementary level with respect to the level of the optical power of the signal light by each of groups GR1, GR2,..., GR8 to make the level of the optical power of the multiplexed signal light K constant so that a wavelength characteristic in a relay transmission line 18 is flat.;COPYRIGHT: (C)2002,JPO