Stable ASE light source for fiber-optic gyroscope

Abstract

The invention provides a stable ASE light source for a fiber-optic gyroscope, which can give consideration to both output spectral width and power stability indexes, is simple in structure and good inspectral symmetry, and is more suitable for high-precision fiber-optic gyroscopes. A most basic two-way forward structure of an ASE light source is adopted, an optical fiber filter is replaced by optimizing the length of an erbium-doped optical fiber, the purpose of spectrum shaping is achieved, and on the aspect of optical power monitoring, a light splitting photoelectric detector with the lightsplitting function and the photoelectric conversion function at the same time is selected, so that cost is saved, and the size is reduced; the spectrum symmetry is good, and the influence of environment temperature change and pumping power fluctuation is small. Compared with a Gaussian ASE light source with the central wavelength being about 1530 nm, the Gaussian ASE light source has the advantages that the spectral symmetry is good, the influence of environment temperature change and pumping power fluctuation is small, and the spectral width is wider. And the power monitoring circuit is usedfor monitoring the change of the power of the light source at different temperatures and feeding back the change to the constant-current source driving circuit, so that the constant-current source driving circuit controls the power deviation and eliminates the instability of power output of the light source under the condition of environmental change.

Description

technical field [0001] The invention belongs to the technical field of fiber optic gyroscopes, in particular to a stable ASE light source for fiber optic gyroscopes. Background technique [0002] Fiber optic gyroscope is the core device in the field of inertial navigation. The light source is the emission source of fiber optic gyroscope, and its performance directly affects the measurement accuracy of fiber optic gyroscope. Fiber optic gyroscopes generally use ASE light sources in the 1550nm band. Due to their irregular output spectra, peaks appear around the center wavelengths of 1530nm and 1560nm. Therefore, it is necessary to shape the spectrum in practical applications. The flat-spectrum ASE light source is widely used in high-precision fiber optic gyroscopes. Its advantages of wide spectrum, high flatness and high power are the ideal light sources for the initial development of high-precision fiber optic gyroscopes. However, with the continuous expansion of fiber optic ...

AI Technical Summary

Problems solved by technology

The optical path structure of the flat-spectrum light source is complex, the volume is large, and the output power instability problem is prominent in the full-temperature environment, and its application field has certain limitations.

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