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Design of Matched Cladding Fiber with UV-Sensitive Cladding for Minimization of Cladding-Mode Losses in Fiber Bragg Gratings

✍ Scribed by M.L. Nielsen; M.O. Berendt; A. Bjarklev; M.G. Dyndgaard

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 114 KB
Volume: 6
Category: Article
ISSN: 1068-5200
DOI: 10.1006/ofte.1999.0309

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✦ Synopsis

The effect on the Bragg-grating-induced cladding-mode coupling of varying the extent of the photosensitive region in a step-index fiber is analyzed. We introduce a figure of merit for the suppression of cladding-mode loss and compare different matched cladding fiber designs. It is found to be advantageous to increase the extent of the photosensitive region. However, no significant improvement is obtained by extending the photosensitive region more than approximately 10 m into the cladding. This result is not in agreement with a simple analysis that neglects UV absorption, which suggests that the radius of the photosensitive region should be close to twice as large.

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## Abstract In this paper, we show that a complete three‐layer analysis is necessary to characterise the cladding modes in order to obtain grating period, resonances, and coupling length in the design of long‐period gratings (LPGs), and that the simplified two‐layer fiber geometry used by many auth