Experiment and Simulation of Step-Index Optical Fiber Temperature Sensor Using Two Modes

Manabu YOSHIKAWA  Shouhei MASAGO  

IEICE TRANSACTIONS on Electronics   Vol.E87-C   No.12   pp.2193-2194
Publication Date: 2004/12/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Optoelectronics
phase shift,  single-mode step-index fiber,  mode excitation,  thermal expansion,  interference,  

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Phase performance in a temperature sensor using a conventional single-mode step-index fiber is studied. Two modes are excited in a so called single-mode fiber when the wavelength of a laser source is shorter than the one suggested by the specification of a fiber. The phase shift due to the temperature change of a step-index fiber is analyzed. The intensity fluctuation by the interference of two modes is observed in the experiment and estimated in the computer simulation.