Segmented waveguide gratings used as optical tilt and displaceme

Details Segmented waveguide gratings used as optical tilt and displaceme Segmented waveguide gratings used as optical tilt and displaceme

1993-01-15

1996-05-28

Bovernick, Rodney B.

Optical waveguides

With optical coupler

Input/output coupler

385 14, 356356, 369 4412, G11B 700, G02B 634

Patent

active

055219950

ABSTRACT:
An apparatus and method are provided for monitoring pointing of a beam in an optical device. The apparatus includes a first input coupling grating having a first grating length and first and second regions for input coupling over a first range of incident angles and producing a first signal, and a second input coupling grating having a second grating length and third and fourth regions for input coupling over a second range of incident angles and producing a second signal. The first grating length is greater than the second grating length thereby making the first range of incident angles less than the second range of incident angles. The method includes forming an input coupling grating for receiving the incident beam, forming a first region on the grating for input coupling the incident beam at a first input coupling angle for deriving a first peak efficiency, and forming a second region on the grating for input coupling the incident beam at a second input coupling angle for deriving a second peak efficiency and separating the first input coupling angle from the second input coupling angle so that a change in angle of incidence will produce an increase in input coupled light in one region and a decrease in the other.

REFERENCES:
patent: 4664524 (1987-05-01), Hattori et al.
patent: 4923300 (1990-05-01), Michel et al.
patent: 5044718 (1991-09-01), Kando
patent: 5051974 (1991-09-01), Taniguchi et al.
patent: 5182610 (1993-01-01), Shibata
patent: 5200939 (1993-04-01), Nishiwaki et al.
patent: 5204516 (1993-04-01), Opheij
patent: 5208800 (1993-05-01), Isobe et al.

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