Abstract

A temperature sensor was demonstrated and fabricated by coating thermosensitive film around a fiber coupler. Based on the multicladding equivalent method, the coated fiber coupler was simplified to a conventional one. With the high thermo-optical coefficient of organic–inorganic solgel material, a good sensing result was achieved. The range of temperature measured is from $-50°\mathrm{C}$ to $100°\mathrm{C}$. The resonant wavelength has a shift of about $25\mathrm{nm}$. A sensitivity of $0.17\mathrm{nm}/°\mathrm{C}$ is achieved. With the advantages of having a simple structure and being unaffected by the instability of the light source, the proposed fiber coupler temperature sensor will find wide applications.

© 2008 Optical Society of America

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