Novel temperature sensor based on evanescent field coupling between a single mode side-polished fiber and a polymer planar waveguide was demonstrated. The resonant wavelength of the coupler was shifted due to thermo-optic effects of a polymer planar waveguide. The symmetric structure of planar waveguide was adopted in order to remove the polarization dependence which is inevitable with the side polished fiber. The fabricated sensors have a sensitivity of -0.71nm/℃ and -3.43nm/℃ when lightguiding polymers are AZ1512 and THB-30 respectively.
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