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Experiment and Simulation of Step-Index Optical Fiber Temperature Sensor Using Two Modes
Manabu YOSHIKAWA Shouhei MASAGO
IEICE TRANSACTIONS on Electronics
Publication Date: 2004/12/01
Print ISSN: 0916-8516
Type of Manuscript: LETTER
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.