Patent ID: 7817893

Claim:
A fiber wrap comprising: 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, wherein the maximum bend radius of the data cable is determined by the equation: 2 ⁢ πΔ ⁢ ⁢ DGD ⁢ ⁢ c λ wherein λ is optical wavelength and Δ ⁢ ⁢ DGD = 0.5 ⁢ C s ⁡ ( r R 2 ) 2 ⁢ Δ ⁢ ⁢ L c - 0.5 ⁢ C s ⁡ ( r R 1 ) 2 ⁢ Δ ⁢ ⁢ L c wherein C s is the stress-optics coefficient and c is the speed of light, R 1 is the bend radius at the end of the wrap motion, R 2 is the bend radius at the start of the wrap motion, r is the radii of the sun cylinder and the planetary cylinder, and Δ ⁢ ⁢ L = 10 360 ⁢ 2 ⁢ π ⁢ ⁢ R 2 .