Patent ID: 6278813
Filing Date: 2001-08-21
Classification: G02B,H04J

Abstract:
A wavelength division multi/demultiplexer for multi/demultiplexing incident light to emit demultiplexed light from each of a plurality of light output ends, comprising:a first wavelength division multi/demultiplexing circuit having at least one light input end and a plurality of light output ends; andat least one second wavelength division multi/demultiplexing circuit of an arrayed waveguide grating type formed on a substrate, including a plurality of light input and output ends, one or two light multiplexing and demultiplexing sections, and a plurality of arrayed waveguides, and having a transmission bandwidth different from that of said first wavelength division multi/demultiplexing circuit, the transmission bandwidth indicating the width of a light frequency that can pass through each light input and output end, whereinsaid first wavelength division multi/demultiplexing circuit and at least one of said second wavelength division multi/demultiplexing circuits are optically connected together, and wherein the light output ends of the final second wavelength division multi/demultiplexing circuit are used as the light output ends of said wavelength division multi/demultiplexer.