Abstract

An improved ellipse-fitting algorithm phase demodulation (EFAPD) technique is proposed to reduce the influence of light source intensity noise on a system. In the original EFAPD, the sum of the intensities of coherent light (ICLS) is an important part of the interference signal noise, which makes the demodulation results suffer. The improved EFAPD corrects the ICLS and fringe contrast quantity of the interference signal by an ellipse-fitting algorithm, and then calculates the ICLS based on the structure of pull-cone 3 × 3 coupler, so as to remove it in the algorithm. Experimental results show that the noise of the improved EFAPD system is significantly reduced compared with that of the original EFAPD, with a maximum reduction of 35.57 dB. The improved EFAPD makes up for the deficiency of the original EFAPD in suppressing light source intensity noise, and promotes the application and popularization of EFAPD.

© 2023 Optica Publishing Group

Phase-shifted demodulation technique with additional modulation based on a 3 × 3 coupler and EFA for the interrogation of fiber-optic interferometric sensors

Jinhui Shi, Dong Guang, Shili Li, Xuqiang Wu, Guosheng Zhang, Cheng Zuo, Gang Zhang, Rui Wang, Qiang Ge, and Benli Yu
Opt. Lett. 46(12) 2900-2903 (2021)

Self-calibration phase demodulation scheme for stabilization based on an auxiliary reference fiber-optic interferometer and ellipse fitting algorithm

Yingjie Wu, Churui Li, Chao Wang, and Bo Jia
Opt. Express 31(3) 4639-4651 (2023)

Four-wavelength quadrature phase demodulation technique for extrinsic Fabry–Perot interferometric sensors

Wanjin Zhang, Ping Lu, Zhiyuan Qu, Jiangshan Zhang, and Deming Liu
Opt. Lett. 47(10) 2406-2409 (2022)

Broadband dispersion spectroscopy using interferometric phase modulation under background light suppression

Wenqing Song, Kokoro Fujiwara, Zheyuan Zhang, Ikki Morichika, and Satoshi Ashihara
Opt. Lett. 48(16) 4257-4260 (2023)

Phase noise suppression technique based on an improved reference interferometer scheme

Wen Zhou, Benli Yu, Jihao Zhang, Jinhui Shi, Dong Guang, Cheng Zuo, Shengquan Mu, Chongxu Fang, Daoxin Zhang, Jiping Lin, and Xuqiang Wu
Opt. Express 31(21) 33765-33775 (2023)