Compact refractometer based on extrinsic-phase-shift fiber Bragg grating
2011; Elsevier BV; Volume: 168; Issue: 1 Linguagem: Inglês
10.1016/j.sna.2011.03.054
ISSN1873-3069
AutoresWenjun Zhou, Xinyong Dong, Liyang Shao, Chi Chiu Chan, Chunliu Zhao, Perry Ping Shum,
Tópico(s)Photonic Crystal and Fiber Optics
ResumoA novel method to measure refractive index of liquids by using an extrinsic-phase-shift fiber Bragg grating (EPS-FBG) is proposed and experimentally demonstrated. The EPS-FBG is obtained by separating two identical FBG reflectors with a micrometer air gap as a phase-shift. This gap forms a phase-shift peak in the transmission spectrum which is dependent upon the refractive index (RI) of the liquid filled in the gap. A large RI measurement range from 1.33 to 1.47 u.r.i. (unit of refractive index) was obtained in the experiment. Experimental results agreed well with the numerical analysis, showing a linear response with the RI sensitivity of ∼1.69 nm/u.r.i. (RI resolution of ∼5.92 × 10−3 u.r.i.). Moreover, the micrometer interaction length in the proposed design makes it potential for microfluidic application.
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