Complete characterization of polarization-maintaining fibers in fiber-optic gyroscope coils using stimulated Brillouin scattering

We comprehensively characterized the birefringence distribution of polarization-maintaining fibers (PMFs) in the fiberoptic gyroscopes using an enhanced Brillouin dynamic grating (BDG).This method enabled the quantitative analysis of the birefringence variations along the fiber, including those induced by temperature, axial strain, and transverse strain.Experimental results revealed that the birefringence coefficients of axial strain and temperature were 0.857 10 -8 / and -4.7 10 -7 /C for the PMF coils, respectively.When PMFs are cross-wound in a layered configuration within the fiber-optic gyroscopes, transverse-strain will significantly impact the birefringence distribution.These findings offer valuable technical guidance for the design and manufacturing of high-precision fiber-optic gyroscopes.