A
fiber optic
gyroscope using a low-polarization and polarization-maintaining
hybrid light path comprises an optical meter head and a circuit
signal processing part, The optical meter head comprises: a
light source, a multi-functional integrated optic
chip, a
detector, a coupler and a
fiber coil, wherein the
light source is a low polarization
light source and single mode
fiber pigtail coupling; the input terminal of multi-functional integrated optic
chip uses a single mode fiber, and the output terminal of multi-functional integrated optic
chip adopts a polarization-maintaining fiber; the input fiber
pigtail of the said
detector is a single mode fiber; the coupler is a 2×2 polarization independence single mode
fiber coupler; the
fiber coil is a polarization-maintaining fiber. By adopting the scheme of the low-polarization and polarization-maintaining
hybrid light path and the
signal processing methods such as all-digital
closed loop control and random
overmodulation etc., the present invention can reduce the effect of light path polarization
crosstalk, simplify the assembling technology, enable large scale production and guarantee the good scale factor
linearity performance and the lower
noise level. Furthermore, by temperature modeling and compensating, the invention enables the bias of the fiber optic
gyroscope to drift more slightly within the all-temperature range, and therefore the fiber optic
gyroscope with good performance and
engineering application can be achieved.