Patent ID: 7292752
Filing Date: 2007-11-06
Classification: G02B,G02F

Abstract:
1. A tuneable grating assisted directional optical coupler to couple a transmission signal, comprising: a first waveguide comprising a first core and a first cladding, said first waveguide having a first effective refractive index; a second waveguide comprising a second core and a second cladding, said second waveguide having a second effective refractive index, different from said first effective index, and being in substantially close proximity to said first waveguide in a predetermined region to provide coupling therebetween; and a periodic perturbation positioned in said coupling region for causing said coupling to be wavelength selective for a given wavelength as a function of said first and/or said second effective refractive index; said second cladding of said second waveguide comprising a tuneable material and said first cladding of said first waveguide comprising a non-tuneable material.