A refractive index sensor based on fiber cavity ring-down spectroscopy

Yuping Wang; Wenhua Ren

doi:10.1117/12.2565373

17 April 2020 A refractive index sensor based on fiber cavity ring-down spectroscopy

Yuping Wang, Wenhua Ren

Proceedings Volume 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications; 114557X (2020) https://doi.org/10.1117/12.2565373
Event: Sixth Symposium on Novel Photoelectronic Detection Technology and Application, 2019, Beijing, China

Abstract

Fiber cavity ring-down(CRD) technology has attracted widespread attentions for its high sensitivity, and has extensive applications in many fields requiring high sensitivity measurement. In this paper, we propose and implement a refractive index sensor based on fiber CRD spectroscopy. A pulse of light passes through a loop resonator formed by two high-splitting ratio couplers and comes out repeatedly. A segment of ~4cm fiber with thin cladding was designed as a refractive index sensor and inserted into the fiber cavity. The sensor appeared different transmission losses with different surrounding refractive indices, which can be measured by detecting the ring-down curves. The experimental results show that the system has a linear response to the surrounding refractive index with a sensitivity of 182.17 μs /RIU in the range of 1.3575~1.4430 at the center wavelength of 1553nm.

Citation Download Citation

Yuping Wang and Wenhua Ren "A refractive index sensor based on fiber cavity ring-down spectroscopy", Proc. SPIE 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications, 114557X (17 April 2020); https://doi.org/10.1117/12.2565373

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