Temperature compensation for high-birefringence fiber loop mirror

We propose a novel temperature compensation method that HBF is mounted on a piece of organic glass. It can lessen its temperature sensitivity to 0.059 nm/K, which are two orders of magnitude lower than that of an uncompensated HBF loop mirror. It is feasible that HBF loop mirror packaged with a large thermal-expansion material is insensitive to ambient temperature perturbation. This technique is beneficial to the practicality of loop mirror filter based fiber sensors.