Abstract
A variable-spun birefringence fiber, as long as the spun rate changes slowly enough and the maximum spun rate is large enough, can realize the conversion between linearly polarized light and circularly polarized light. Environment temperature may affect the beat length of the birefringence fiber, which leads to the instability of the polarization of the fiber wave plates. According to the relation between the beat length of the fiber and the temperature, we discuss the thermal stability of variable-spun fiber wave plates with different structural parameters, and give the temperature range for qualified operation. The research results are of referential value to the design, fabrication and evaluation of the variable-spun fiber wave plates.
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