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In this letter, the nonlinear photonic crystal fiber (NLPCF) has been exploited for the first time, as a high-temperature sensor based on the modal interferometric technique with a sensitivity that is remarkably higher along with low strain sensitivity. We have obtained a very high temperature sensitivity of 73 pm/°C and a very low strain sensitivity of 0.93 pm/με. The temperature to strain cross sensitivity is found to be significantly low in the very high range of temperature and strain. The proposed sensor may find application in strain-effective areas requiring accurate temperature measurement even at a high temperature range.