Patent ID: 6606433
Filing Date: 2003-08-12
Classification: G02B,G02F,H04J

Abstract:
An optical multi/demultiplexer including M arrayed waveguide gratings and a waveguide type circulating filter connected in cascade, each of the arrayed waveguide gratings having a same channel spacing and a center wavelength of a channel shifted by an amount of 1/M of the channel spacing, and the waveguide type circulating filter having M periodic output transmission spectra with a repetition period identical to the channel spacing, wherein said waveguide type circulating filter comprising:two optical waveguides; (N+1) directional couplers for coupling said optical waveguides at (N+1) different locations, where N is an integer greater than one; and means for providing said optical waveguides at N locations between said directional couplers with an optical path length difference.