Date of Award

Summer 1993

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Electrical & Computer Engineering

Program/Concentration

Electrical Engineering

Committee Director

Sacharia Albin

Committee Member

Ravindra P. Joshi

Committee Member

Vishnu K. Lakdawala

Call Number for Print

Special Collections LD4331.E55B79

Abstract

A fluorosensor works on the basis of light injection from the clad into the core of an optical fiber. The sensitivity of such a sensor depends on the efficiency of light injection. Conditions necessary for a high injection efficiency are experimentally determined. The refractive index difference between the core and the clad,ncore -nclad, must be maximized to achieve a high injection efficiency. Since an air clad has the least refractive index, a bare core fiber will have a maximum efficiency. Standard optical fibers used for communication employ a minimum value for ncore -nclad, in order to reduce modal dispersion and increase the usable diameter. These fibers do not have a high efficiency and hence they are not suitable for fluorosensor applications. The injection efficiency is found to increase with the fiber diameter. The experimental results are in good agreement with the theoretical models based on a weakly guiding approximation and an exact field solution.

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DOI

10.25777/csfn-7z49

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