Abstract

We present the results of optical-characterization experiments conducted on optically active erbium-doped waveguides. Using selected characterization results presented in this paper and a simple analysis, the device operation is evaluated. Each of the core and the cladding layers were individually fabricated using a single sol-gel deposition. These are, to the best of our knowledge, the first optically active waveguides to be fabricated in such a way. Characterization results include gain, fluorescence-lifetime, waveguide-loss, polarization-dependent-loss (PDL), and erbium-absorption measurements. Relative gains of over 1 dB · cm-1 were measured. Fluorescence lifetimes of the <sup>4</sup>I<sub>13/2</sub> ---> <sup>4</sup>I<sub>15/2</sub> transition as high as 5.6 ms were observed. Waveguide losses as low as 0.13 dB · cm<sup>-1</sup> were measured.

© 2005 IEEE

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