Method of making an optical fiber grating, and article made by t

Details Method of making an optical fiber grating, and article made by t Method of making an optical fiber grating, and article made by t

1996-10-11

1998-04-28

Lee, John D.

Optical waveguides

With optical coupler

Input/output coupler

65425, 385 12, 385 24, 385123, 430290, 430321, G02B 634

Patent

active

057456151

ABSTRACT:
The method of making an optical fiber refractive index grating comprises writing the grating through the fiber coating. The method involves providing optical fiber of significantly higher photosensitivity than conventional fiber, such that the grating can be written before unacceptable darkening of the coating occurs. Such fiber is H.sub.2 and/or D.sub.2 -loaded silica-based fiber having a Ge-doped core, the fiber selected to have a germanium-oxygen deficiency center content that provides the fiber with a photosensitivity that is at least twice as large as that of an otherwise identical, conventionally prepared, optical fiber. The fiber typically is drawn from a preform, at least a portion of which was exposed to a reducing atmosphere at an elevated temperature.

REFERENCES:
patent: 5104209 (1992-04-01), Hill et al.
patent: 5157747 (1992-10-01), Atkins et al.
patent: 5208877 (1993-05-01), Murphy et al.
patent: 5235659 (1993-08-01), Atkins et al.
patent: 5604829 (1997-02-01), Bruesselbach
patent: 5620495 (1997-04-01), Aspell et al.
"Measurement of the Ultraviolet Absorption Spectrum of Optical Fibers", by R. M. Atkins, Optics Letters, vol. 17, No. 7, Apr. 1, 1992, pp. 469-471.
"Growth of Bragg Gratings Produced by Continuous-Wave Ultraviolet Light in Optical Fiber", by H. Patrick et al., Optics Letters, vol. 18, No. 18, Sep. 15, 1993, pp. 1484-1486.

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