Optical waveguide structure

Details Optical waveguide structure Optical waveguide structure

2007-01-09

2007-01-09

Pak, Sung (Department: 2874)

Optical waveguides

Planar optical waveguide

C385S131000

Reexamination Certificate

active

10619556

ABSTRACT:
A waveguide structure according to the invention comprises a core layer (10), having a refractive index ncore, and an array of rods (11) in the core layer having a refractive index nrods. The refractive indices satisfy the inequality: nrods>ncore. In a planar waveguide structure buffer (12) and cladding (13) layers are included, having a refractive index nbufferand ncladdingrespectively. The refractive indices then satisfy the inequality: nrods>ncore>ncladdingand nbuffer. This condition provides greater vertical confinement of the E-field of an optical signal passing through the waveguide. Furthermore, it allows waveguides to be formed of a glassy material having a similar refractive index and core dimensions to that of a fiber. A high refractive index contrast within the photonic crystal region is used while totally eliminating the need for mode conversion to launch light in and out of the waveguide.

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