BIDIRECTIONAL WAVELENGTH DIVISION MULTIPLEXING SYSTEM, ESPECIALLY INCLUDING BRAGG REFLECTOR LASER AS LIGHT SOURCE

摘要

PURPOSE: A bidirectional wavelength division multiplexing(WDM) system is provided, which includes an economic light source more stable as to temperature variation. CONSTITUTION: According to the bidirectional wavelength division multiplexing(WDM) system, a central base station(100) includes down stream Bragg reflector lasers(111,112) generating a plurality of down stream channels. The central base station multiplexes the down stream channels as down stream optical signals and demultiplexes received upper stream optical signals as a plurality of upper stream channels having different wavelength each other. A local base station(200) demultiplexes the down stream optical signals received from the central base station as a plurality of down stream channels, and multiplexes the plurality of upper stream channels having different wavelength as upper stream optical signals and then outputs them to the central base station. And upper stream Bragg reflector lasers(331,332) output wavelength-locked upper stream channels to the local base station, and a plurality of subscribers(301,302) detect the corresponding down stream channel received from the local base station.