Analysis of stress in winding fiber-optic ring

Some opinions to coiling the optic fiber ring were expatiated from two facets that quadrupole symmetry winding method and stress control which was emphasis and nodus during winding. These views were concluded from the practical winding experiments, and it should be useful to improve the winding quality. The strain distributing in the polarization-maintaining-fiber was measured and analyzed by BOTDR (brillouin optical time domain reflectometer). It shows from the results of the measurement and analysis that BOTDR can be used to filtrate and analyze the optic fiber and optic fiber ring strain. It shows from the research, experiment and application, the stress control during winding a coil is the key factor, it should be remained in a proper range.