Method for making continuously chirped fiber bragg gratings

Details Method for making continuously chirped fiber bragg gratings Method for making continuously chirped fiber bragg gratings

1996-11-04

1998-02-17

Hoffmann, John

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65111, 216 12, 216 24, 216 80, 216 47, C03B 3700

Patent

active

057187380

ABSTRACT:
In accordance with the invention, a continuously chirped fiber Bragg grating is made by fabricating a continuously chirped phase mask and using the mask to write a Bragg grating on a parallel fiber. The chirped phase mask is made by exposing a photoresist-coated mask substrate to two interfering beams: one a collimated beam and the other a beam reflected from a continuously curved mirror. After etching, the resulting phase mask can be used to write a chirped fiber grating having a continuously varying grating period without physical modification of the fiber. The resulting fiber grating has a widened bandwidth and uniform dispersive delay characteristics useful for dispersion compensation in critical telecommunications applications.

REFERENCES:
patent: 3676914 (1972-07-01), Fiore
patent: 5116461 (1992-05-01), Lebby
patent: 5620495 (1997-04-01), Aspell
patent: 5636304 (1997-06-01), Mizrahi

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