Patent ID: 6377351
Filing Date: 2002-04-23
Classification: G01C

Abstract:
A fiber-optic laser gyroscope comprising:a laser resonator having a fiber-optic loop reflector at one end and a mirror at the other end thereof, said laser resonator including optical amplifying means and optical pumping means provided therein; phase modulating means, located in said fiber-optic loop reflector, for producing an optical pulse train; means for detecting said optical pulse train from said laser resonator to convert it into an electrical signal; and phase sensitive detecting means for extracting from said converted electrical signal a component having a frequency which is the same as or an integral multiple of that of a phase-modulated signal and having the same phase as said phase-modulated signal, and detecting from said extracted component a phase difference between two light beams passing through said fiber-optic loop reflector in opposite directions with each other.