Abstract

Transmission of intense femtosecond $825\mathrm{nm}$ pulses progressively produces a waveguide at the entrance of a heavily Ge-doped silicate fiber. The waveguide behaves as a multimillimeter long-fiber bandpass filter that scatters away light with wavelengths shorter or longer than $850\mathrm{nm}$. This phenomenon has been correlated with the $\sim 800\mathrm{nm}$ photosensitivity producing type I-IR fiber Bragg gratings in side-written lightly Ge-doped silicate fibers and low-loss waveguides in pure silica bulk glass. A model incorporating color center formation is proposed to understand the underlying mechanism.

© 2008 Optical Society of America

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