M-Z type spectra shaper for optical fiber sensing

Abstract

The invention discloses an M-Z type spectra shaper for optical fiber sensing. A first input arm is connected with a first input arm of a first coupler, a second input arm is connected with a second input arm of the first coupler, a first output arm of the first coupler is connected with one end of a first interference arm, and a second output arm of the first coupler is connected with one end of a second interference arm; the other end of the first interference arm is connected with a first input arm of a second coupler, the other end of the second interference arm is connected with the second input arm of the second coupler, a first output arm of the second coupler is connected with the first output arm, and a second output arm of the second coupler is connected with the second output arm; a phase modulator is arranged at one side of the first interference arm; and incident lights are input to the first input arm of the first coupler from the first input arm, and emergent lights are output respectively by the first output arm and the second output arm. A 3dB bandwidth of spectra is near 100nm, and therefore, shaping form ASE light source quasi-rectangular spectra to gaussian-like spectra is efficiently realized.

Description

technical field [0001] The invention relates to spectrum shaping and sensing technology, in particular to an M-Z type spectrum shaping device for optical fiber sensing. Background technique [0002] One of the important means for the rapid development of fiber optic gyroscopes with the advantages of all solid state, miniaturization, impact resistance, anti-interference, high precision, and long life to higher precision is to use ASE light sources with higher power and better spectral stability. However, the ASE light source cannot meet the requirements of the fiber optic gyroscope in terms of spectrum type, because the fiber optic gyroscope uses the interference of broad-spectrum light waves, that is, white light, to detect the angular rate, and requires a Gaussian or Gaussian-like spectrum type to achieve a rapid decrease in the value of the spectral coherence function. Keeping the value low reduces coherent noise. At present, the ASE light source for communication is ampl...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the shortcomings of the current ASE light source spectrum used for communication is a rectangular spectrum, which does not meet the Gaussian spectrum required by the fiber optic gyroscope, and the existing spectrum shaping method is complex in structure, large in size, and high in cost, the purpose of the present invention is to provide an M-Z spectrum for optical fiber sensing. Type spectral shaper, which effectively realizes the shaping of the ASE light source from the rectangular spectrum to the Gaussian spectrum, and meets the needs of the development of high-precision fiber optic gyroscopes

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