High count optical fiber distribution cable
First Claim
1. A high count optical fiber distribution cable having optical fiber attenuation stability over a range of temperatures comprising:
- (a) A center sub-unit comprising a sub-unit center strength member and at least one buffer tube stranded about said center sub-unit forming a single helix, said center strength member having a tensile strength of at least 4,350,000 psi and a coefficient of thermal expansion of no more than 25×
106 Cm/Cm/°
C.;
(b) one or more additional sub-units stranded about the center sub-unit each additional sub-unit comprising at least one buffer tube stranded in a double helix configuration and a sub-unit strength member, each buffer tube stranded about said sub-unit strength member and each sub-unit strength member having a tensile strength of at least 4,350,000 psi and a coefficient of thermal expansion of no more than 25×
106 Cm/Cm/°
C.; and
,(c) 300 or more elongated optical fibers, in one or more of said buffer tubes, that vary no more than 0.2 db/km in attenuation when said high count optical fiber distribution cable is subjected to temperatures between -40° and
70°
C. at wavelengths of 1310 nm and 1550 nm.
2 Assignments
0 Petitions
Accused Products
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° and 70°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 25×10-6 Cm/Cm/°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.
-
Citations
11 Claims
-
1. A high count optical fiber distribution cable having optical fiber attenuation stability over a range of temperatures comprising:
-
(a) A center sub-unit comprising a sub-unit center strength member and at least one buffer tube stranded about said center sub-unit forming a single helix, said center strength member having a tensile strength of at least 4,350,000 psi and a coefficient of thermal expansion of no more than 25×
106 Cm/Cm/°
C.;(b) one or more additional sub-units stranded about the center sub-unit each additional sub-unit comprising at least one buffer tube stranded in a double helix configuration and a sub-unit strength member, each buffer tube stranded about said sub-unit strength member and each sub-unit strength member having a tensile strength of at least 4,350,000 psi and a coefficient of thermal expansion of no more than 25×
106 Cm/Cm/°
C.; and
,(c) 300 or more elongated optical fibers, in one or more of said buffer tubes, that vary no more than 0.2 db/km in attenuation when said high count optical fiber distribution cable is subjected to temperatures between -40° and
70°
C. at wavelengths of 1310 nm and 1550 nm. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
2. The distribution cable of claim wherein the number of optical fibers is between 300 and 420.
Specification