UV-Induced Absorption, Scattering and Transition Losses in UV Side-Written Fibers

UV-Induced Absorption, Scattering and Transition Losses

D. Johlen, F. Knappe, H. Renner, E. Brinkmeyer,
UV-Induced Absorption, Scattering and Transition Losses in UV Side-Written Fibers
Proc. Conf. Opt. Fiber Comm. (OFC), San Diego, CA, USA (ThD1), (1999)
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Abstract: Bragg gratings in single-mode Fibers made by UV illumination are now widely used as wavelength selective devices, in particular in WDM networks. Depending on the particular application, more or less attention has to be paid to apodization of the index variation, to chirp of grating constants, mode conversion properties etc. Also to be listed but often ignored is the fact that UV-written components add loss to an optical network and - what may beeven worse - light can be scattered there and might deteriorate the overall performance of a device. In this paper we investigate the contributions of UV-induced absorption, UV-induced scattering and of transition losses caused by asymmetries of the UV-induced index increase. Our experimental results for hydrogen loaded photosensitive Fibers indicate that all these eÿects are of practical importance and must be taken into account.

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