Apodization method for a bragg grating

Details Apodization method for a bragg grating Apodization method for a bragg grating

2005-03-15

2005-03-15

Ullah, Akm Enayet (Department: 2874)

Optical waveguides

With optical coupler

Input/output coupler

C385S010000, C065S392000

Reexamination Certificate

active

06868208

ABSTRACT:
The invention provides a method of photoinducing a Bragg grating in an optical fiber (300) or a waveguide, in which a selected zone of the fiber (300) or waveguide is subjected to a step of being exposed with a source beam (120) using a mirror (200) in such a manner as to fold a portion (122) of the source beam (120) as reflected by the mirror (200) onto a portion (224) of the source beam that is not reflected by the mirror, thereby obtaining a diffraction grating in the fiber (300) or waveguide, the method being characterized in that an additional exposure step is performed on said portion of the fiber (300) or waveguide, and in that relative displacement is imparted between the two exposure steps to elements selected from the beam (120), the fiber (300) or waveguide, and the mirror (200) in such a manner as to cause a same portion of the beam (120) used for photoinduction in both exposure steps to be reflected by the mirror (200) in one of the steps and not reflected by the mirror (200) in the other step.

REFERENCES:
patent: 5629998 (1997-05-01), Cook et al.
patent: 5708738 (1998-01-01), Perez et al.
patent: 6043497 (2000-03-01), Quetel et al.
patent: 6574395 (2003-06-01), Mechin et al.
patent: 0884611 (1998-12-01), None
patent: 0884612 (1998-12-01), None
patent: 0949518 (1999-10-01), None
patent: 2778750 (1999-11-01), None
“Apodised in-fibre Bragg grating reflectors photoimprinted using a phase mask”, Electronics Letters, Feb. 2, 1995, vol. 31, No. 3, p. 223-224.

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