Scale factor stabilization of a broadband fiber source used in f

Details Scale factor stabilization of a broadband fiber source used in f Scale factor stabilization of a broadband fiber source used in f

1998-06-25

2000-02-15

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

060259159

ABSTRACT:
A system for performing scale factor stabilization of a broadband optical signal source used in fiber optic gyroscopes in radiation environments. An optical signal source is provided comprising a pump light source and an optical fiber arranged to receive pump light from the pump light source. Light output from the optical fiber is input into a wavelength division multiplexer. An optical gain fiber having an erbium-doped core is connected to the wavelength division multiplexer and arranged to be optically pumped by the pump light such that the gain fiber emits broadband light that propagates to the wavelength division multiplexer. An output optical fiber is connected to the wavelength division multiplexer and arranged to guide a portion of the broadband light emitted by the gain fiber to a fiber optic gyroscope. A filter device is positioned in-line with the broadband light emitted by the gain fiber to attenuate light outside of the bandwidth of the filter device. The filter device allows a bandwidth of light narrower than the spectral width of the broadband light source to propagate through while attenuating all wavelengths of light outside of its operating bandwidth. Only the portion of the broadband source spectrum contained within the bandpass of the filter is selected out, thus narrowing the spectral width of the broadband fiber source. This narrower spectral width reduces the shift of centroid wavelength of the broadband fiber source which results when the gain fiber and other sensitive optical components are exposed to ionizing radiation.

REFERENCES:
patent: 4938556 (1990-07-01), Digonnet et al.
patent: 5108183 (1992-04-01), Fling et al.
patent: 5231465 (1993-07-01), Huang et al.
patent: 5638473 (1997-06-01), Byron

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