Arrangements for reducing wavelength sensitivity in...

Optical waveguides – Integrated optical circuit

Reexamination Certificate

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C385S030000, C385S031000, C385S033000, C385S036000, C385S043000, C385S129000, C385S130000

Reexamination Certificate

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06917730

ABSTRACT:
An optical coupling system for use with multiple wavelength optical signals provides improved coupling efficiency between a free-space optical beam and a relatively thin, surface layer of an SOI structure (“SOI layer”), allowing for sufficient coupling efficiency (greater than 50%) over a predetermined wavelength range. An evanescent coupling layer, disposed between a coupling prism and an SOI layer, is particularly configured to improve the coupling efficiency. In one embodiment, the thickness of the evanescent layer is reduced below an optimum value for a single wavelength, the reduced thickness improving coupling efficiency over a predetermined wavelength range around a defined center wavelength. Alternatively, a tapered thickness evanescent coupling layer may be used to improve coupling efficiency (or a combination of reduced thickness and tapered configuration). Optical beam steering can be combined with a modified evanescent coupling layer to control the input beam launch angle and further improve coupling efficiency.

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patent: WO 2004097902 (2004-11-01), None

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