Optical waveguides – Optical transmission cable – Loose tube type
Patent
1992-04-16
1993-09-07
Ullah, Akm E.
Optical waveguides
Optical transmission cable
Loose tube type
G02B 644
Patent
active
052436756
ABSTRACT:
A hermetically sealed optical fiber cable (20) includes a core (21) comprising a plurality of optical fiber ribbons (22,22) disposed within a core tube (30) comprised of a high temperature resistant polymeric material. The core tube is disposed within a hermetic sealing member (40) which comprises a metal of low electrochemical activity having a sealed seam. An outer jacket (50) is disposed about the hermetic sealing member. The core may be filled with a waterblocking filling material (35). The material of the core tube undergoes only limited degradation because of the limited amount of oxygen and/or moisture trapped in the hermetically sealed cable. The filling material and/or other materials of the cable scavenge moisture and oxygen which travel longitudinally of the cable and reach portions of the cable subjected to a high temperature because of a leak in an adjacent steam line. The filling material and/or other materials are such that they cooperate with polymeric materials of the cable to prevent oxygen and humidity from degrading coating material of the optical fiber. Further, the filling material and the core tube are such that degradation of the core tube in the hermetically sealed cable is avoided.
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McKay, et al., Qualification Procedure For Fiber Optic Cable Design, Int. Wire & Cable Symposium Proceedings 1986, pp. 307-313.
Vyas, et al, Design and Development of Steam Resistant Fiber Optic Cable, Int. Wire and Cable Symposium Proceedings 1991, p. 55.
Kathiresan Krishnaswamy
Santana Manuel R.
Shea John W.
Taylor Carl R.
AT&T Bell Laboratories
Hayes, Jr. Donald E.
Somers Edward W.
Ullah Akm E.
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