A FREQUENCY CALIBRATION METHOD FOR MULTILOCATION OPTICAL FDM NETWORKS

A simple laser frequency calibration method is proposed for optical fr equency-division-multiplexing communications networks where users are at remote locations. We calibrate the frequency of a transmitter laser by tuning it to a resonant peak of a Fabry-Perot etalon and determini ng the mode number of the resonant peak. We use a distributed frequenc y reference and a local Fabry-Perot etalon whose cavity length is slig htly changed during the measurement. This method provides a high measu rement accuracy with a cavity length change of less than 5%.