A kind of fiber light source (605,705) includes laser pump (ing) (654,754), is configured as generating pump laser beam in a predetermined wavelength; First segment rare earth doped fiber (652-1,752-1); Second segment rare earth doped fiber (652-2,752-2); The first end and second segment of the first part of first end are connected to photo-coupler (656,756). Photo-coupler (656,756) is configured to split type pump laser beam and is based on power coupling ratio. First segmentation, which generates the first stimulated emission and aspirates the fluctuation of laser power and second segment with the first mean wavelength sensitivity and generate the second stimulated emission, has the second mean wavelength sensitivity to aspirate the fluctuation of laser power so that exporting the fluctuation of the combination of the stimulated emission of (664,764) from the approximate power for pump laser of the first and second stimulated emissions presentation mean wavelength progress. Optical fibre gyro includes that above-mentioned fiber light source is also disclosed.
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