WAVELENGTH DIVISION MULTIPLEXED PASSIVE OPTICAL NETWORK WITH WAVELENGTH TRACKING APPARATUS AND METHOD FOR WAVELENGTH TRACKING THEREOF

摘要

The present invention relates to a wavelength division multiplexing passive optical network, and its wavelength tracking method comprising a wavelength-tracking device.; Wavelength tracking method of the present invention multiplexes a plurality of multiplexed optical signals to the station with the central base station, the multiplexed downstream optical signals transmitted by the central office comprising a multiplexer to a downlink transmission having a group demultiplexer and outputting for each channel wavelength division multiplexing passive in the optical network, multiplexing the downstream transmission optical signal having a wavelength and an integer multiple of the FSR light for a wavelength tracking with the off wavelength by (free spectral range) with the downstream transmission optical signal comprising a local base station by the steps of: transmitting to the base station area; It demultiplexes the multiplexed optical signal, the downstream transmission optical signal is received and reflected by the optical wavelength tracking for each channel process to send back to the central base station and; The wavelength for receiving the tracking light coming back to the central office so as to maximize the received power is characterized in that it comprises the step of controlling the temperature of the multiplexer.