Amorphous fluorinated polyimide optical-fiber coating
AssigneeNufern
InventorIan MARTIN
Life of this patent
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Abstract
An optical fiber includes a glass structure to guide light along a longitudinal axis of the optical fiber, and an amorphous coating disposed on and surrounding the glass structure. The amorphous coating includes at least one fluorinated polyimide. A repeating unit each fluorinated polyimide includes two imide groups and at least one fluorinated aliphatic spacer group. Each imide group is attached to a terminus of a fluorinated aromatic group. The amorphous coating has a low refractive index, high-temperature stability, and low optical absorption, making the optical fiber suitable for high-power applications subject to high temperatures. The amorphous quality of the coating is compatible with fiber drawing and provides the necessary mechanical strength for the optical fiber when in use.
Claims23
An optical fiber, comprising:
- a glass structure to guide light along a longitudinal axis of the optical fiber;
- and
- an amorphous coating disposed on and surrounding the glass structure, the amorphous coating including at least one fluorinated polyimide, a repeating unit of each of the at least one fluorinated polyimide including:
- two imide groups, each of the two imide groups attached to a terminus of a fluorinated aromatic group, and
- at least one fluorinated aliphatic spacer group.
A chemical mixture for forming an amorphous coating on an optical fiber, comprising:
- at least one fluorinated polyimide, a repeating unit of each of the at least one fluorinated polyimide including:
- two imide groups, each of the two imide groups attached to a terminus of a fluorinated aromatic group, and
- at least one fluorinated aliphatic spacer group;
- an adhesion promoter;
- a thermal stabilizer;
- and
- a solvent.
Dependencies are inferred from the claim text.