Patent ID: 6618537
Filing Date: 2003-09-09
Classification: G02B

Abstract:
A method of fabricating an optical waveguide structure, comprising:forming on a silicon substrate an optical waveguide core between lower and upper cladding layers of silicon oxide, each of said core and said lower and upper cladding layers formed by plasma enhanced chemical vapor deposition from silicon, oxygen and dopant containing atmospheres, deposition of said lower and upper cladding layer utilizing boron and phosphorous sources; annealing the waveguide core and the lower cladding layer such that the waveguide core is converted to optical quality glass, and forming the upper cladding layer by a succession of alternating deposition and annealing steps to conformally cover said waveguide core, to produce a waveguide structure such that said core has a higher refractive index than the refractive indices of each of the lower and upper cladding layers sufficient to enable waveguiding of optical signals introduced into said core.