Formation of Bragg gratings in optical fibers by a transverse holographic method

✍ Scribed by Meltz, G.; Morey, W. W.; Glenn, W. H.

• Book ID: 115417501
• Publisher: Optical Society of America
• Year: 1989
• Tongue: English
• Weight: 435 KB
• Volume: 14
• Category: Article
• ISSN: 0146-9592
• DOI: 10.1364/OL.14.000823

✦ Synopsis

Bragg gratings have been produced in germanosilicate optical fibers by exposing the core, through the side of the cladding, to a coherent UV two-beam interference pattern with a wavelength selected to lie in the oxygen-vacancy defect band of germania, near 244 nm. Fractional index perturbations of approximately 3 x 10(-5) have been written in a 4.4-mm length of the core with a 5-min exposure. The Bragg filters formed by this new technique had reflectivities of 50-55% and spectral widths, at half-maximum, of 42 GHz.