This paper summarizes and compares four kinds of bidirectional wavelength optical add drop multiplexers (OADMs) based on some technique papers. We introduce the principles and structures of them. They are (1) OADM using FBGs and multiport optical circulators; (2) OADM using waveguide grating routers and FBG; (3) OADM using AWG; (4) OADM using DMUX/MUX and optical switchs.
关键词
光分插复用器光纤光栅光环形器
Keywords
optical add drop multiplexerfiber Bragg gratingoptical circulator