ABSTRACTA temperature sensor based on a High‐Birefringence photonics crystal fiber loop mirror (HiBi‐PCF‐FLM) with a reflection probe was theoretical simulated and experimentally demonstrated. The interference spectrum of the FLM presented high sensitivity to temperature variation of the surrounding medium. High‐temperature sensitivity of 7.38 nm/°C with good linearity was obtained in theory; this result was proved by the consequent experiment. Meanwhile, the measuring range of temperature can be tuned using the HiBi‐PCF with different length or Birefringence. As the reflection probe is a reflected structure, it is benefit to use in the area of high‐sensitivity remote temperature sensing. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1334–1337, 2014