Patent ID: 6421151
Filing Date: 2002-07-16
Classification: H04B

Abstract:
A method of wavelength stabilization for multichannel optical transmission systems, in which for each channel of a plurality of channels there is a transmitter with a source of laser light which produces an optical carrier signal with a wavelength predetermined for each respective channel, comprising the steps of:modulating the optical carrier signal of each channel with a modulation signal to produce a plurality of modulated optical carrier signals, where the modulation signal has a modulation frequency which is predetermined for each channel; combining the plurality of modulated optical carrier signals using a wavelength selective multiplexer to produce an optical total signal; converting at least part of the optical total signal into an electrical total signal; mixing the electrical total signal with the modulation frequencies that are predetermined for each of the channels, the modulation frequencies being directly input to the mixer; determining an amplitude of the signal based on the output of said mixing step; and controlling a wavelength of the channel to be stabilized using the amplitude.