G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 6/44 (2006.01)
Patent
CA 2177451
A slotted core type optical fiber ribbon cable includes a cylindrical rod having a plurality of helical slots in its exterior surface. A slot holds a stack of optical fiber ribbons each having a planar array of optical fibers therein. The pitch of the helical slot is selected so as to allow total optical fiber stranding strain .epsilon. of the edge fibers in the ribbon to be at least 0.05% and compression .epsilon.e on the middle optical fiber or optical fibers in the ribbon to be less than about 0.03%. The magnitude of the slot pitch is selected to be in the range Pc < P < Ps, with Pc = (-6.718 + 76.094 Wr ) + (-2.0467 + 0.33014 Wr ) Rr and Ps = (340.92 + 1.3495 Wr + 6.8775 Wr2 ) + (4.5417 - 0.07796 Wr -0.037 Wr2 ) Rr, where P is the slot pitch, Wr is the width spanned by the optical fibers in the ribbon, and Rr is the radial distance between the rod longitudinal axis and the midpoint of the width spanned by the optical fibers in the bottommost ribbon.
Ellwanger Michael R.
Wagman Richard S.
Gowling Lafleur Henderson Llp
Siecor Corporation
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