Low loss lateral optical waveguide intersections

Details Low loss lateral optical waveguide intersections Low loss lateral optical waveguide intersections

2002-10-23

2009-08-18

Doan, Jennifer (Department: 2874)

Optical waveguides

Integrated optical circuit

C385S043000, C385S123000, C385S125000, C385S129000

Reexamination Certificate

active

07577320

ABSTRACT:
A geometrically shaped optical waveguide crossing or intersection with minimal transmission loss is described. A symmetrically tapered waveguide intersection is used to minimize loss in the intersecting region where at least two optical waveguides cross one another at 90° or nearly 90°. The present invention embodies a waveguide crossing that includes tapering the width of the waveguides as they approach the intersecting region, forcing the propagating light to contract, thereby reducing asymmetric field distortions, and thus reducing transmission loss and effectively minimizing crosstalk. This is accomplished by focusing the propagating light through a perpendicular or near perpendicular in at least two waveguide intersection by simple linear tapering rather than by the use of a lens or other previously used devices.

REFERENCES:
patent: 6198860 (2001-03-01), Johnson et al.
patent: 6445845 (2002-09-01), Sakata et al.
patent: 6813419 (2004-11-01), Matsushima et al.
patent: 7040814 (2006-05-01), Morimoto et al.
patent: 10103273 (2002-08-01), None
patent: 05-060929 (1993-12-01), None

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