Method for making long-period fiber gratings

Details Method for making long-period fiber gratings Method for making long-period fiber gratings

1996-11-04

2000-04-18

Hoffmann, John

Glass manufacturing

Processes of manufacturing fibers, filaments, or preforms

Process of manufacturing optical fibers, waveguides, or...

65425, 65111, C03B 3710

Patent

active

06050109&

ABSTRACT:
Applicants have discovered that exposing optical fiber to an electrical arc produces a perturbation in its refractive index and that gratings can be made by exposing fiber to arcs at a series of locations along its length. In a first variation of the process, the fiber is exposed under tension to a high current arc (>15 mA) for a prolonged period of time (>2 s). Using this method, long period gratings can be successfully fabricated from fiber without the use of special dopants. In a second variation, the fiber is doped and the tension is reduced. The resulting grating is optically weaker but mechanically stronger. A third variation uses hydrogen-sensitized fibers and reduced currents and times. The resulting grating is optically and mechanically strong.

REFERENCES:
patent: 4804248 (1989-02-01), Bhagavatula
patent: 4867776 (1989-09-01), Sharp
patent: 4946250 (1990-08-01), Gonthier
patent: 5411566 (1995-05-01), Poole
patent: 5495548 (1996-02-01), Bilodeau
Dianov, et al, Thermo-induced Long-Period Fibre Gratings, p53-56, ECOC 97, Sep. 1997, Conf. Pub. 448.

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