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US 6,898,354 B2Granted
Fiber optic cable demonstrating improved dimensional stability
AssigneeJudd Wire, Inc.
InventorsYoung Joon Kim, Francis A. Gnatek, Jeffrey S. Doak
Life of this patent
Estimating the term…
Abstract
A fiber optic cable that employs a dual layer jacket and that demonstrates improved dimensional stability over a wide temperature range, is provided. In a preferred embodiment, the inventive cable is flame-retardant and, upon flaming, smoke suppressed and non-hazardous.
Claims34
A fiber optic cable that comprises:
- (a) at least one optical fiber;
- (b) a primary buffer member circumferentially surrounding each optical fiber;
- (c) optionally, a heat insulating and dimensionally stabilizing member circumferentially surrounding the primary buffer member;
- (d) a secondary buffer member circumferentially surrounding and physically contacting an outer surface of either the primary buffer member or the heat insulating and dimensionally stabilizing member;
- (e) a strength member circumferentially surrounding the secondary buffer member;
- and
- (f) a dual layer jacket circumferentially surrounding and physically contacting an outer surface of the strength member, which comprises a heat or pressure sealed, low-shrinkage polymer film inner layer, and an outer protective layer.
4 more elements
A fiber optic cable that comprises:
- (a) at least one optical fiber;
- (b) a primary buffer member comprising a polyimide coating circumferentially surrounding the optical fiber(s);
- (c) a secondary buffer member comprising a high temperature fluoropolymer extruded around and physically contacting an outer surface of the primary buffer member;
- (d) a strength member comprising straight aromatic polyamide fibers axially extending and circumferentially surrounding the secondary buffer member;
- end
- (e) a dual layer jacket circumferentially surrounding and physically contacting an outer surface of the strength member, which comprises a heat-fused, spirally wrapped, tow-shrinkage polyimide tape inner layer, and an extruded fluoropolymer outer layer.
3 more elements
A fiber optic cable that comprises:
- (a) at feast one optical fiber;
- (b) a primary buffer member comprising an acrylate coating circumferentially surrounding the optical fiber(s);
- (c) a heat insulating and dimensionally stabilizing member comprising twisted or helically orientated, aromatic polyamide fibers spirally wrapped around the primary buffer member.
- (d) a secondary buffer member comprising a high temperature fluoropolymer extruded around the heat insulating and dimensionally stabilizing member;
- (e) a strength member comprising straight aromatic polyamide fibers axially extending and circumferentially surrounding the secondary buffer member;
- and
- (f) a dual layer jacket comprising a heat-fused, spirally wrapped, low-shrinkage polyimide tape inner layer, and an extruded fluoropolymer outer layer.
4 more elements
A process for preparing a fiber optic cable, which comprises:
- (a) forming a primary buffer member on at least one optical fiber:
- (b) optionally, forming a heat insulating and dimensionally stabilizing member on the primary buffer member;
- (c) forming a secondary buffer member on either the primary buffer member or the heat insulating and dimensionally stabilizing member, wherein the secondary buffer member physically contacts an outer surface of either the primary buffer member or the heat insulating and dimensionally stabilizing member;
- (d) forming a strength member on the secondary buffer member;
- and
- (e) forming a dual layer jacket on the strength member by
- i. wrapping a low-shrinkage polymer film in an overlapping fashion along a portion or length of the strength member.
- ii. optionally, heating the low-shrinkage polymer film to a temperature sufficient to cause overlapping regions of the film to bond,
- iii. forming an outer protective layer on the inner layer, and
- iv. optionally, crosslinking the outer protective layer.
7 more elements
Dependencies are inferred from the claim text.