Abstract
Fiber wave plates are usually used for the transformation of polarization state in fiber sensing systems. Environment temperature and operating wavelength may influence the beat length of the birefringence fiber, inducing the instability of fiber wave plates on polarization transforming. As for the variable-spun fiber wave plate with different structure parameters (fiber length, spun rate profile and maximum spun rate), this paper firstly focuses on the influence of beat length on its equivalent phase retardation. Then considering the relation between beat length and temperature or operating wavelength, further discussions are made about its thermal stability and achromatic performance, and temperature ranges and the achromatic bandwidth are given for the qualified fiber wave plate. The results are of referential value to the design, fabrication and evaluation of the variable-spun fiber wave plate.
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