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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1993),
  • paper CFD4

Spatial distribution of UV-induced luminescence in Ge-doped fiber preform

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Abstract

The photosensitivity of Ge-doped optical fibers is a useful property that allows the fabrication of periodic refractive index structures, like Bragg gratings. These structures have numerous applications such as narrowband filters. It has been shown that the photosensitivity is related to the presence of a Ge-spedfic defect that absorbs light over a band centered at 240 nm and luminesces around 400 nm.1,2 This luminescence has been used as a tool to characterize both the concentration of defects, and the bleaching of the 240-nm band upon UV irradiation.3 Recently, Atkins et al.4 have made a study of the spatial distribution of this luminescence that is excited by an electron beam, and shown that the luminescence maxima occur on the edge of the core and at its center. In the experiments reported here it is shown that the luminescence at 400 nm is not a linear function of Ge concentration, while the absorption at 240 nm does follow the variation in Ge spatially across the core. Thus the luminescence is not a linear function of defect concentration. Quenching of the luminescence is put forward as a possible mechanism to explain the observed results.

© 1993 Optical Society of America

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