Optical waveguide device

Details Optical waveguide device Optical waveguide device

1994-08-02

1995-07-25

Bovernick, Rodney B.

Optical waveguides

With optical coupler

Input/output coupler

385 14, 385 31, 359569, G02B 634

Patent

active

054369916

ABSTRACT:
An optical waveguide device for coupling an external wave with a guided wave by means of a grating coupler formed on an optical waveguide device which lies on a substrate. The grating coupler is further coated with a cladding layer. An external wave is transformed into a guided wave after being diffracted by a first grating coupler, and travels along the waveguide to a second grating coupler. The guided wave is then subjected to diffraction by means of the second grating coupler, whereupon a minus first-order wave is diffracted only toward the substrate, whilst other waves of higher order are respectively diffracted toward the cladding layer and the substrate. The wave diffracted toward the cladding layer is totally reflected from a cladding layer boundary furtherst from the substrate, thereby passing through the substrate. The diffracted wave thus reflected interferes with the other wave of the same order diffracted to the substrate, thereby weakening each other.

REFERENCES:
patent: 4691982 (1987-09-01), Nishimura et al.
patent: 4730330 (1988-03-01), Plihal et al.
patent: 4887255 (1989-12-01), Handa et al.
patent: 5081615 (1992-01-01), Sunagawa
patent: 5101459 (1992-03-01), Sunagawa
"Efficiency of Optical-Grating Couplers", R. Ulrich, Optical Society of America, vol. 3, No. 11, pp. 1419-1431. 26 Jan., 1973.

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