Polarization-maintaining ASE light source with intensity noise cancellation function and fiber-optic gyroscope

Abstract

The invention discloses a polarization-maintaining ASE light source with an intensity noise cancellation function and a fiber-optic gyroscope. Output tail fibers of the polarization-maintaining ASE light source are connected with optical paths of the fiber-optic gyroscope respectively, and then intensity noise cancellation of the light source can be achieved. According to the polarization-maintaining ASE light source, the optical integrator is adopted to replace an isolator, a filter and a 50: 50 coupler, the optical integrator has the functions of isolation, filtering, polarization and lightsplitting, linearly polarized light is output, the number of optical devices can be effectively reduced, and the structural complexity of the ASE light source is greatly reduced. Light output by the optical integrator is linearly polarized light, the insertion loss of the optical integrator is small, the index requirements for the splitting ratio and polarization of the two polarization-maintaining couplers behind can be reduced, the whole structure is easy to achieve, and the machining cost can be reduced. Moreover, the splitting ratios of the two polarization maintaining couplers can be matched and adjusted according to the lengths of different optical fiber rings, and the structure is flexible.

Description

technical field [0001] The invention relates to the technical field of fiber optic gyroscopes, in particular to a polarization-maintaining ASE light source and a fiber optic gyroscope with an intensity noise cancellation function. Background technique [0002] The performance parameters of the light source are closely related to the performance of the fiber optic gyro. The stability of the scale factor of the fiber optic gyroscope is directly related to the stability of the average wavelength of the light source. The coherent noise of the fiber optic gyroscope depends on the spectral width of the light source. The minimum detection sensitivity of the fiber optic gyro is determined by the fiber The signal-to-noise ratio of the gyroscope is determined, and the signal-to-noise ratio of the fiber optic gyroscope can be improved by increasing the power of the light source. Therefore, the erbium-doped fiber light source based on amplified spontaneous emission (Amplified Spontaneous...

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Problems solved by technology

[0005] In view of this, the present invention provides a polarization-maintaining ASE light source with the function of canceling intensity noise to solve the problems of large intensity noise and complex structure of the existing ASE light source

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