Fiber optic interferometer with wavelength-stabilized light source
US5485274A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 17, 1994 |
| Grant date | Jan 16, 1996 |
| Priority date | — |
| Expiry date | Oct 17, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/726
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An integrated optics chip is employed as a Michelson interferometer for stabilizing the wavelength of a light source in a fiber optic Sagnac interferometer for measuring rotation rate. A statistically-independent second signal component is applied in addition to a resetting digital phase ramp dependent on rotation rate to a phase modulator incorporated in the integrated optics chip (MIOC). The second signal component optimizes the working point of the phase modulator. By employing such statistically-independent variation of the phase modulation, the light wavelength-dependent measuring signal of the Michelson interferometer may be demodulated from the detector read-out signaled used for readjustment of the light-source wavelength via a light-source temperature and/or injection current change. In open loop operation, scale factor variations can be compensated using the light wavelength-dependent measuring signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.