Polarization Drift Eliminating Fiber Wrap Design and Method

摘要

A fiber wrap and a method of rotating the fiber wrap without twisting a data cable are disclosed. The fiber wrap includes a sun gear, a sun cylinder coupled to the sun gear, a planetary gear in contact with the sun gear, a planetary cylinder coupled to the planetary gear, an outer housing in contact with the planetary gear, and a data cable coupled to the sun cylinder, the planetary cylinder, and the outer housing. The maximum bend radius of the data cable is determined by the equation: $2\mathrm{piDelta}DGD\frac{c}{\mathrm{lambda}}$ wherein lambda is optical wavelength and $\mathrm{Delta}DGD=\frac{0.5{C_s\left(\frac{r}{R_2}\right)}^2\mathrm{Delta}L}{c}-\frac{0.5{C_s\left(\frac{r}{R_1}\right)}^2\mathrm{Delta}L}{c}$ wherein Cs is the stress-optics coefficient, c is the speed of light, R1 is the bend radius at the end of the wrap motion, R2 is the bend radius at the start of the wrap motion, r is the radii of the sun cylinder and the planetary cylinder, and $\mathrm{Delta}L=\frac{10}{360}2\mathrm{pi}R_2.$