Patent
1989-02-03
1989-11-21
Sikes, William L.
G02B 644
Patent
active
048817953
ABSTRACT:
A high count optical fiber distribution cable having a center sub-unit in the form of a single helix and an outside member in the form of a double helix configuration, the cable structure of which results in optical fiber attenuation stability of no more than 0.2 db/km variance in attenation at the operating wavelengths of 1310 nm and 1550 nm between -40.degree. and 70.degree.C.; each sub-unit is composed of one or more optical fiber bearing buffer tubes or cylindrical members stranded about a sub-unit strength member, the sub-unit strength member having an elastic modulus of at least 4,350,000 psi and coefficient of thermal expansion of no more than 25.times.10.sup.-6 Cm/Cm/.degree.C., the buffer tubes of each sub-unit having a lay length of no less than 100 mm and the subunits themselves as a sub-unit having a lay length of 900 mm, and no less than 300 elongated optical fibers disposed in one or more of the buffer tubes of the sub-units.
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Moffitt Roy B.
Siecor Corporation
Sikes William L.
Ullah Akm E.
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