Integrated optical circuit

Details Integrated optical circuit Integrated optical circuit

1998-09-23

2000-12-19

Palmer, Phan T. H.

Optical waveguides

Integrated optical circuit

385 12, 385 49, 385 50, 356350, G02B 612

Patent

active

061636320

ABSTRACT:
An integrated optical circuit for use in a fibre optic gyroscope which senses rotation rates by determining a phase shift due to the Sagnac Effect between light beams travelling around an optical fibre sensing loop (4) in opposite directions, the circuit being provided on a silicon-on-insulator chip comprising a layer of silicon separated from a substrate by an insulating layer, the circuit comprising: rib waveguides (11) formed in the silicon layer for receiving light from a light source (2) and transmitting light to a light detector (3), fibre optic connectors (9) in the form of grooves etched in the silicon layer for receiving the respective ends of the optical fibre sensing loop (4); rib waveguides (11) formed in the silicon layer for transmitting light to and from said fibre optic connectors (9) so as to direct light beams in opposite directions around the sensing loop (4) and receive light beams returning therefrom, phase determining means and (13,17,31) integrated in silicon layer for determining a phase shift between the light beams returning from the sensing loop (4).

REFERENCES:
patent: 4787691 (1988-11-01), Lorenzo et al.
patent: 4997246 (1991-03-01), May et al.
patent: 5194917 (1993-03-01), Regener
patent: 5757986 (1998-05-01), Crampton et al.
patent: 5787214 (1998-07-01), Harpin et al.
A. G. Rickman, et al.: "Silicon-on-insulator, optical rib waveguides: loss, mode characteristics, bends and y-junctions", IEE Proceedings: Optoelectronics, vol. 141, No. 6, Dec. 1, 1994, pp. 391-393.
International Search Report for PCT/GB98/02871(1 page).
Great Britain Patent Office Search Report for GB 9720085.1, Jan. 27, 1998 (2 pages).

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