Acta Photonica Sinica, Volume. 40, Issue 12, 1881(2011)
Experimental Research of Refractive-Index Sensing Properties Based on Thin-core Fiber Modal Interferometer
A refractive-index sensor with micro-structured defect was proposed and demonstrated,and its refractive-index characteristics were studied experimentally.After inserting a segment of thin-core fiber into a standard single-mode fiber,high-order cladding modes were excited and interfered with the core mode to form an in-fiber modal interferometer because of the mismatch between thin-core fiber and standard single-mode fiber .By decreasing of the cladding-diameter of the thin-core fiber,the evanescent field of the cladding modes was enhanced,which improved the sensitivity of refractive-index.Experimental results show that the proposed device has advantages of low loss,low cost,high sensitivity and good linearity.
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WU Hao-wei, YING Chao-fu, PENG Bao-jin, XU Fei, ZHAO Ya-hui. Experimental Research of Refractive-Index Sensing Properties Based on Thin-core Fiber Modal Interferometer[J]. Acta Photonica Sinica, 2011, 40(12): 1881
Received: Jul. 13, 2011
Accepted: --
Published Online: Jan. 4, 2012
The Author Email: Hao-wei WU (wuhaoweissg@sina.com)