Patent ID: 6904219
Filing Date: 2005-06-07
Classification: C03B,G02B,H01S

Abstract:
1. A planar waveguide comprising: a doped core region having a first refractive index and substantially elongated along a first axis compared to a second orthogonal axis; said core region being embedded in a first cladding region; said first cladding region having a refractive index substantially matched to said first refractive index; a second outer cladding surrounding said first cladding with a second refractive index lower than said first refractive index; a partial third depressed inner cladding region embedded in said first cladding region, having a refractive index lower than said first refractive index; the partial third depressed inner cladding region at least partially surrounding and having an intimate contact with said core region comprising gaps located at least at opposite distal ends of said core region along said first axis.