SYSTEME DE TRANSMISSION OPTIQUE AVEC AJUSTEMENT DE GAIN

摘要

An optical transmission system with gain adjustment comprises an optical device for adjusting the gain of an ALC load channel conveyed in a wavelength division multiplex (WDM) of a transmission line. The gain adjustment device comprises an optical demultiplexer and an optical multiplexer having filter elements adapted to filtering some or all of the channels constituting the multiplex conveyed in the transmission line, a device for measuring the optical power of the ALC load channel, and a device for adjusting the power of the ALC load channel and controlled to compensate for the loss of power from the load channel on passing through the filter device. Such a system serves to improve the effectiveness of the load channel conveyed in a WDM line in order to guarantee that the total optical power of the multiplex is kept constant.