Ka Kha Wong

US Patent:

7746476, Jun 29, 2010

Filed:

Jul 11, 2007

Appl. No.:

11/776452

Inventors:

Joseph R. Demers - Glendale CA, US
Ka Kha Wong - Alhambra CA, US

Assignee:

Emcore Corporation - Albuquerque NM

International Classification:

G01C 19/72

US Classification:

356462, 356460

Abstract:

A fiber optic gyroscope including an optical circulator in the path of said first and second beams for providing polarized first and second beams of identical polarization. A phase modulator couples the first and second beams to the first and second end respectively of the fiber loop, and couples for receiving the return first and second beams from the second and first ends respectively of the fiber loop. First and second photodiodes are coupled to the optical circulator for receiving the optical signal from the first and second return beams.

US Patent:

20130033737, Feb 7, 2013

Filed:

Aug 4, 2011

Appl. No.:

13/198488

Inventors:

Ka Kha Wong - Alhambra CA, US

Assignee:

Emcore Corporation - Albuquerque NM

International Classification:

G02F 1/01
B32B 38/10
B23P 11/00
B32B 37/12

US Classification:

359279, 156 60, 156256, 29428

Abstract:

Methods of attaching an optical line to a phase modulator in a fiber optic gyroscope. The methods include positioning at least one end of the optical line relative to a side of the phase modulator. The end of the optical line may have a first non-perpendicular angle and the side of the phase modulator may have a second non-perpendicular angle. The end of the optical line may be attached to the side of the phase modulator with the end of the optical line being non-parallel to the side of the phase modulator. The optical line may be an optical coil or a light path.

US Patent:

58502866, Dec 15, 1998

Filed:

May 12, 1997

Appl. No.:

8/854664

Inventors:

Daniel E. Auerbach - Thousand Oaks CA
Amado Cordova - West Hills CA
Eric L. Goldner - Valencia CA
John E. Higbee - Simi Valley CA
James R. Steele - Jackson WY
Ka Kha Wong - Westlake Village CA

Assignee:

Litton Systems, Inc. - Woodland Hills CA

International Classification:

G01C 1972

US Classification:

356350

Abstract:

An interferometric rotation rate sensor is arranged to overcome effects of the unavoidable generation of intensity spikes in the modulated optical output. An electrooptical device is located within the optical path of the sensor for receiving the optical output signal from the sensor coil and transforming it prior to application to the photodetector. The electrooptical device is driven by a periodic electrical signal with a period equal to the loop transit time of light traveling through the sensor coil. By synchronizing the periods of attenuation with the predictable presence of spikes in the optical output, valid optical signal information is preserved while gyro electronics are sheltered from the results of optical intensity spiking.