A temperature compensation method and device for an erbium-doped fiber superfluorescent light source pump laser

Abstract

The invention belongs to the field of optical fiber sensing, in particular a temperature compensation method for an Er-doped optical fiber superfluorescence (SFS) light source pumping laser and a device thereof, which are characterized in that a temperature detection unit detects the temperature Tc inside a light source in real time and transmits the temperature information to a driving control unit; the driving control unit calculates the work current compensation quantity delta I of the pumping laser corresponding to the measured temperature Tc according to the function relationship betweenthe work current compensation quantity of the SFS light source pumping laser and the light source temperature stored in the driving control unit, the driving control unit immediately drives the pumping laser so that the work current is regulated into I=I0+delta I. The method and the device have the advantages that optical and circuit devices are not additionally introduced, the light path structure is simple, the power consumption is lower, the control is simple, and the manufacturing cost is reduced.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing, in particular to a temperature compensation method and device for an erbium-doped fiber superfluorescence (SFS) light source pumping laser. Background technique [0002] The fiber optic gyroscope has become the mainstream inertial instrument due to its advantages of solid state, long life, high reliability, small size, and light weight, while the interferometric fiber optic gyroscope based on the Sagnac effect needs to use a wide-spectrum light source with a short coherence length to Reduce the coherence error and noise caused by back Rayleigh scattering, polarization coupling, Kerr effect, etc. in the fiber ring, and improve the rotation sensitivity of the fiber optic gyroscope. [0003] The rotation measurement accuracy of the interferometric fiber optic gyroscope depends on the stability of the optical scale factor (scale factor), which will shift the Sagnac phase by Ф s is related to the...

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Problems solved by technology

[0009] In order to compensate the temperature stability of the average wavelength of the SFS light source, long-period fiber gratings, chirped fiber gratings, and photonic bandgap fiber filters are used in the optical path structure of the SFS light source, and the characteristics of their attenuation spectrum changing with temperature are used to compensate the average The wavelength changes with temperature, the above three compensation methods increase the complexity of the optical path on the one hand, and increase the power consumption of the light source on the other hand, and the fiber optic gyroscope system has extremely high requirements for power consumption

In U.S. Patents US 7269190 B2 and US 7764718 B2, the function relationship between the average wavelength of the SFS light source and the temperature of the erbium-doped fiber is linearly fitted. In the patent, this function is only used in a small temperature range to calibrate the measured average wavelength of the light source. For In terms of the working temperature range of the fiber optic gyroscope, the change of the average wavelength with the temperature of the erbium-doped fiber in the whole temperature range is not a simple linear relationship, and no exact compensation method is proposed.

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