WAVELENGTH MULTIPLEXER/DEMULTIPLEXER, AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a wavelength multiplexer/demultiplexer having low loss and its manufacturing method. SOLUTION: When a photonic crystal filter 30 is to be optically connected to a demultiplexing side waveguide 3a of a wavelength multiplexer/demultiplexer main body 41, either of the transmission wavelength band of the waveguide 3a or the transmission wavelength band of the photonic crystals of the filter 30 is made wider than the other, no precision alignment for optical axes is required and positioning operations are easily conducted. Since the wavelength band of a channel as each transmission wavelength is determined by a narrower band, connection loss is suppressed. COPYRIGHT: (C)2005,JPO&NCIPI