Phase modulated self-mixing interferometer of a fiber laser system

作者：Hao Hui; Wang Ming^*; Xia Wei; Guo Dongmei; Lu Huali

来源：Optics and Laser Technology, 2013, 51: 55-61.

DOI：10.1016/j.optlastec.2013.03.013

• Self-mixing interferometer
• Sinusoidal phase modulation
• All-fiber sensing system

In this paper, self-mixing interference measurement based on phase modulation is demonstrated using a fiber laser system. The measurement setup is built by an erbium-doped fiber laser and an integrated-optic phase modulator. Optical feedback and phase modulated interference is theoretically analyzed, and the phase demodulation algorithm of the interference signal is implemented by Fourier analysis. Error sources induced by the distortion of the interference signal in the presence of optical feedback and the imperfect alignment between the polarization of the light and the electro-optically active axis are evaluated in detail. The system is experimentally applied to reconstruct the motion of a high-precision commercial PZT and a displacement measurement accuracy of lambda/20 is obtained, providing a practically feasible solution for displacement measurement based on all optical-fiber sensing applications with high precision.

• 出版日期2013-10
• 单位南京师范大学