Patent ID: 6347165
Filing Date: 2002-02-12
Classification: G02B

Abstract:
A wavelength demultiplexer:an optical power distributor for evenly dividing multiplexed input light by intensity; a plurality of optical waveguides for transmitting said divided multiplexed light and causing constant optical path length differences among adjacent waveguides, each optical waveguide comprising a straight optical waveguide and including two parts of different effective refractive indices, each of said straight optical waveguides having a unique difference in the length of said two parts, said difference in length of said two parts being determined by the following equation; &Dgr;Lk=n1l1k,k+1+n2l2k,k+1 where &Dgr;Lk is the optical path length difference of optical waveguides, n1 is the effective refractive index of material 1, n2 is the effective refractive index of material 2, l1k,k+1 is the difference in length of adjacent optical waveguides of material 1, and l2k,k+1 is the difference in length of adjacent optical waveguides of material 2; andan optical power combiner for receiving output signals of said plurality of optical waveguides and separating said output signals by phase.