ADD/DROP OPTICAL MULTIPLEXER AND METHOD FOR ADDING CHANNEL

摘要

PROBLEM TO BE SOLVED: To realize both an add/drop function and an add and continue function for WADM node of an optical communication network at the same time. SOLUTION: This invention provides a configuration including two duplicate port waveguide grating routers(WGR) and a plurality of attenuation switches. The one WGR is configured as a 1×2N demultiplexer and the other as a 2N×1 multiplexer. Each WGR includes a plurality of duplicate input or output waveguides and the respective pairs have nearly the same spectral characteristic. The 1st output waveguides of the 1st WGR are connected to the input waveguides of the 2nd WGR and the attenuation switches are provided between them to cut off a specific wavelength. The 2nd output waveguide of the 1st WGR act like drop waveguide and the 2nd waveguides of the 2nd WGR act like add waveguides to realize the add/drop function.