Patent ID: 6885823
Filing Date: 2005-04-26
Classification: G02B

Abstract:
1. An optical multiplexing/demultiplexing unit used in an optical communication system having one or more such units, comprising: a first waveguide configured to input a first optical wave in which a plurality of wavelengths corresponding to multiple channels are multiplexed; a first filter connected with the first waveguide, said first filter configured to separate the first optical wave from the first waveguide into a second optical wave in a first wavelength band and a third optical wave in a second wavelength band; the second optical wave including adjacent wavelengths in a part of the plurality of wavelengths and the third optical wave including adjacent wavelengths in the other part of the plurality of wavelengths; a second filter connected with the first filter, said second filter configured to separate the second optical wave from the first filter into a fourth optical wave in a third wavelength band and a fifth optical wave in a fourth wavelength band; the fourth optical wave including adjacent wavelengths in a part of the plurality of wavelengths of the second optical wave and the fifth optical wave including adjacent wavelengths in the other part of the plurality of wavelengths of the second optical wave; an optical-demultiplexer adapted to demultiplex the third optical wave into optical waves each of a single wavelength; a second waveguide connected with the second filter, said second waveguide directing the fourth optical wave to a succeeding unit; and a third waveguide connected with the second filter, said third waveguide directing the fifth optical wave to a succeeding unit.