Method for forming and apparatus comprising optical...

Optical waveguides – Planar optical waveguide

Reexamination Certificate

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C385S014000, C385S037000, C385S132000, C065S429000, C216S002000, C216S024000

Reexamination Certificate

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07027703

ABSTRACT:
A method for forming and apparatus comprising a free space coupler region having a plurality of optical waveguides coupled to the space coupler region at an interface region, the waveguides converging with one another to the interface region, and a trench formed between adjacent waveguides, the depth of the trench or trenches extending from an outer point to the interface region and monotonically decreasing in depth from the outer point to the interface region.

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