Intermittent-connection-type optical fiber ribbon and optical cable

Patent metadata

Field	Value
Publication number	US-10488609-B2
Application number	US-201715771797-A
Country	US
Kind code	B2
Filing date	Jan 11, 2017
Priority date	Jan 13, 2016
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

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.

First claim

The invention claimed is:

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.

Assignees

• Sumitomo Electric Industries

Inventors

• Sato Fumiaki
• Tsuchiya Kenta
• Okada Keisuke
• Nagao Yoshiaki
• Suzuki Nobuyuki

Classifications

• G02B6/44

  Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables (cables incorporating electric conductors and optical fibres {where features relating to the optical fibres are not of interest} H01B11/22) · CPC title

• G02B6/4409

  for ribbons · CPC title

• G02B6/4403 Primary

  with ribbon structure (G02B6/4429, G02B6/4439, G02B6/4479 take precedence) · CPC title

• G02B6/448

  Ribbon cables · CPC title

• G02B6/4482

  Code or colour marking · CPC title