An intensity measurement of a temperature-insensitive strain sensor is proposed based on a highly birefringent photonic crystal fiber loop mirror(HiBi-PCF-FLM).The strain sensor is realized by using a short length of highly birefringent photonic crystal fiber(PCF) as the sensing element inserted in a fiber loop mirror(FLM).Due to the ultralow thermal sensitivity of the PCF,the proposed strain sensor is inherently insensitive to temperature.When a DFB laser as a light source passes through the FLM,the output...