BIDIRECTIONAL ADD/DROP MULTIPLEXER OF WAVELENGTH ALTERNATION SYSTEM

摘要

PURPOSE: A bidirectional add/drop multiplexer of a wavelength alternation system is provided to perform bidirectional transmissions, and to reduce the number of optical elements, then to interleave channels for configuring forward and reverse optical signals, thereby increasing efficiency of optical fiber and wavelength bands. CONSTITUTION: The first interleaver(545) outputs a forward optical signal to the second end, and outputs a reverse optical signal through the first end. The second interleaver(585) interleaves the forward optical signal and the reverse optical signal by wavelength, and outputs the interleaved signals through the third end. An add/drop multiplexer adds a channel selected in the interleaved optical signals, or drops the selected channel. The third interleaver(590) outputs the reverse optical signal to the first interleaver(545), and outputs the rest forward optical signal through the third end. The fourth interleaver(595) outputs a reverse optical signal to the second interleaver(585), and outputs a forward optical signal to the second end.