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In-Fiber Quasi-Michelson Interferometer Based on Waist-Enlarged Fiber Taper for Refractive Index Sensing

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PROJECT TITLE :

In-Fiber Quasi-Michelson Interferometer Based on Waist-Enlarged Fiber Taper for Refractive Index Sensing

ABSTRACT:

A completely unique refractive-index (RI) Michelson interferometer primarily based on a waist-enlarged taper is achieved. Such a tool is fabricated by splicing a piece of multimode fiber (MMF) at one end of single-mode fiber (SMF). Because of the fiber bitaper at the coupling point of SMF and MMF, the light is coupled into the MMF from lead in fiber core, and the intermodal interference will occur for the optical path distinction between core mode and cladding mode. Then, the light will be mirrored at the top of the fiber and recoupled back to the lead out fiber core by the fiber bitaper. When the lights return back to the lead out fiber, the intermodal interference will occur for the optical path distinction between core mode and high order mode. The sensor features a linear response to RI with a sensitivity of -178.424 dB/RIU within the range of 1.351-one.4027 RIU. The temperature cross sensitivity is also analyzed, and therefore the influence can be eliminated by simultaneous measurement of RI and temperature through the matrix equation. The proposed sensor features the benefits of easy fabrication, low price, high mechanical strength, which build it a sensible candidate for bio-chemical measurement.


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In-Fiber Quasi-Michelson Interferometer Based on Waist-Enlarged Fiber Taper for Refractive Index Sensing - 4.9 out of 5 based on 71 votes

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