Loading patent…
AssigneesSumitomo Electric Industries, Ltd., Nippon Telegraph and Telephone Corporation
InventorsHiroki Ishikawa, Yoshiyuki Suetsugu, Gen Morikawa, Hideyuki Iwata
Estimating the term…
In the optical cable in accordance with the present invention, the reversal angle φ from one reverse portion to the next reverse portion in an S-Z type helical groove is at least 180 degrees; and, letting W, T, and n be the width and thickness of each optical fiber ribbon and the number of stacked sheets of optical fiber ribbons, respectively, and a and b be the width and depth of the helical groove, respectively, at least each reverse portion of the helical groove has a cross-sectional form satisfying: nT<a≦{square root over (W2+L +(nT+L )2+L )} (1) W<b (2) whereas the remaining portion of the helical groove has a cross-sectional form satisfying: {square root over (W2+L +(nT+L )2+L )}<min(a, b) (3).
An optical cable comprising a tension member disposed at a center thereof, an elongated chamber element having at least one S-Z type helical groove whose direction of strand on an outer periphery reverses periodically, and a plurality of sheets of optical fiber ribbons stacked within said helical groove;
An optical cable comprising a tension member disposed at a center thereof, an elongated chamber element having at least one S-Z type helical groove whose direction of strand on an outer periphery reverses periodically, and a plurality of sheets of optical fiber ribbons stacked within said helical groove of said chamber element;
Dependencies are inferred from the claim text.