Method and system for detecting optical ring resonator resonance frequencies and free spectral range to reduce the number of lasers in a resonator fiber optic gyroscope

Patent metadata

Field	Value
Publication number	US-8947671-B2
Application number	US-201313774678-A
Country	US
Kind code	B2
Filing date	Feb 22, 2013
Priority date	Feb 22, 2013
Publication date	Feb 3, 2015
Grant date	Feb 3, 2015

Abstract

A resonator fiber optic gyroscope (RFOG) is provided. The RFOG includes a gyroscope resonator having a clockwise input port and a counter-clockwise input port; a first laser configured to couple a clockwise optical beam into to the clockwise input port; a clockwise Pound-Drever-Hall modulation generator to modulate the clockwise optical beam with a resonance tracking modulation before the clockwise optical beam is coupled into the clockwise input port; bias correction electronics; FSR-detection-and-servo electronics including a switch communicatively coupled to the clockwise Pound-Drever-Hall modulation generator; a clockwise transmission detector configured to receive an optical beam output from the counter-clockwise input port and output signals to the bias correction electronics and the FSR-detection-and-servo electronics; and a second laser configured to couple a counter-clockwise optical beam into to the counter-clockwise input port, wherein the FSR of the gyroscope resonator is measured based on the Pound-Drever-Hall modulation of the clockwise optical beam.

First claim

What is claimed is:

1. A resonator fiber optic gyroscope, comprising:
a gyroscope resonator having a clockwise input port and a counter-clockwise input port and a free spectral range (FSR);
a first laser configured to couple a clockwise optical beam into to the clockwise input port;
a clockwise Pound-Drever-Hall modulation generator to modulate the clockwise optical beam with a resonance tracking modulation before the clockwise optical beam is coupled into the clockwise input…

Assignees

• Honeywell Int Inc

Inventors

• Strandjord Lee K
• Salit Mary K
• Qiu Tiequn
• Sanders Glen A

Classifications

• G01C19/721 Primary

  Physics · mapped topic

• G01C19/727 Primary

  Physics · mapped topic