Multiplexing of fiber Fabry-Perot interferometer for multi-point refractive index sensing application

Zongda Zhu; Shunhu Yang; Yongkang Dong

doi:10.1117/12.2599260

18 June 2021 Multiplexing of fiber Fabry-Perot interferometer for multi-point refractive index sensing application

Zongda Zhu, Shunhu Yang, Yongkang Dong

Proceedings Volume 11850, First Optics Frontier Conference; 118500E (2021) https://doi.org/10.1117/12.2599260
Event: First Optics Frontier Conference, 2021, Hangzhou, China

Abstract

We proposed a multiplexing method of optical fiber Fabry-Perot interferometer (FPI) for multi-point refractive index (RI) sensing application. This method is based on the frequency modulated continuous wave (FMCW) interferometry, in which a series of FPIs are connected by fiber couplers as like the bus-structure. Due to the spatial difference among FPIs, the reflection signals from different FPIs can be separated in spatial domain by Fourier transform. Applying inverse Fourier transform, the interference spectra of every FPIs can be demodulated independently in wavelength domain. Three FPIs are multiplexed for verifying the multi-point RI sensing ability of the proposed method. The experimental results show that the proposed multiplexing method performs well in multi-point RI sensing applications. In the RI range of 1.3334~1.3410, the RI sensitivities of the multiplexed FPIs are as high as 1200 nm/RIU, and the RI measurement accuracies are as high as 5×10^-6 RIU. In addition, the sensing system can demodulate the interference spectrum from the reflected signal as low as 5 pW. When the light source power is 3.2 mW, the theoretical maximum multiplexing number is 8000. This work provides an efficient solution for multi-point RI sensing.

Citation Download Citation

Zongda Zhu, Shunhu Yang, and Yongkang Dong "Multiplexing of fiber Fabry-Perot interferometer for multi-point refractive index sensing application", Proc. SPIE 11850, First Optics Frontier Conference, 118500E (18 June 2021); https://doi.org/10.1117/12.2599260

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