Intermittent-connection-type optical fiber ribbon and optical cable
An intermittent-connection-type optical fiber ribbon in which a plurality of optical fiber core wires are disposed in parallel, and which includes: a connecting part where adjacent optical fiber core wires are connected; and a non-connecting part where adjacent optical fiber core wires are not connected, the connecting parts and the non-connecting parts are provided intermittently in a longitudinal direction, the non-connecting parts are not provided in the longitudinal direction between two the optical fiber core wires, the connecting part is recessed, and in a case where, in the longitudinal direction, a is length of the connecting part, b is length of a part where the non-connecting part between different optical fiber core wires overlap, c is length of the non-connecting part, and p is an interval of the connecting parts, c/a≥1.5, b≤50 mm, and (c/a)×p≥200 mm are set.
1. An intermittent-connection-type optical fiber ribbon which is covered with a connecting resin in a state where a plurality of optical fiber core wires are disposed in parallel, the intermittent-connection-type optical fiber ribbon comprising: a connecting part where adjacent optical fiber core wires are connected to each other; and a non-connecting part where adjacent optical fiber core wires are not connected to each other,
wherein the connecting parts and the non-connecting parts are provided intermittently in a longitudinal direction,
wherein each of the plurality of optical fiber core wires is paired with an adjacent optical fiber core wire, and the non-connecting parts are not provided between each respective pair in the longitudinal direction throughout the length of the optical fiber ribbon,
wherein the connecting part is recessed, and
wherein in a case where a is length of the connecting part in the longitudinal direction, b is length of a part where the non-connecting part between different optical fiber core wires overlap in the longitudinal direction, c is length of the non-connecting part in the longitudinal direction, and p is an interval of the connecting parts in the longitudinal direction, a≥8 mm, c/a≥1.5, b≤50 mm, and 400 mm≤(c/a)×p≤750 mm are set.
2. The intermittent-connection-type optical fiber ribbon according to claim 1 ,
wherein adjacent two optical fibers are in contact with each other partially in the longitudinal direction.
3. An optical cable comprising:
a cylindrical tube; and
a plurality of intermittent-connection-type optical fiber ribbons according to claim 1 ,
wherein the plurality of intermittent-connection-type optical fiber ribbons are covered with the tube in a state of being bundled.
4. An optical cable comprising:
a slot rod that includes a plurality of slot grooves; and
a plurality of intermittent-connection-type optical fiber ribbons according to claim 1 , and
wherein the plurality of intermittent-connection-type optical fiber ribbons are housed separately in the slot grooves.