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Title: Fabrication and numerical evaluation of the tapered single mode optical fiber: Detection of change in refractive index
Authors: Kude, Vivek P
Khairnar, R S
Keywords: Single mode fiber;Refractive index sensor;Evanescent waves;Signal attenuation
Issue Date: Jan-2008
Publisher: CSIR
Abstract: The fabrication of the tapered single mode fiber has been carried out. The tapered fiber is numerically evaluated for propagation behaviour of light by means of bound rays and tunneling rays in tapered portion. The nature of bound and tunneling rays as a function of refractive index is observed numerically, which shows that tapered portion of the fiber is suitable for sensor application. To make the fiber sensitive to refractive index of the medium other than core medium, it is etched up to fiber core using hydrofluoric acid (HF). The sensitivity of the sensor has been studied by varying the diameter of the etched portion in the fiber. The tapered portion is dipped in the DMSO solution having various molarity thereby exhibiting different refractive indices. The optical signal is passed through the fiber and output signal intensity has been measured with a wide wavelength photo-detector. The output intensity measured in voltage is found to be linearly dependent on the refractive indices surrounding the etched portion of the fiber. The result shows that the tapered single mode optical fiber is sensitive to refractive index of liquid at short (1 meter) as well as long (1.8 km) length of optical fiber. It also reveals that a distant detection and sensing can be carried out by a single mode tapered fiber sensors.
Page(s): 23-29
ISSN: 0019-5596
Appears in Collections:IJPAP Vol.46(01) [January 2008]

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