Abstract

The attenuation properties of Co2+-doped single-mode optical fibers were experimentally and analytically investigated for preparation of a stable flatband attenuator. By controlling the Co2+-doped region in a fiber core, we could prepare a flatband attenuator in which the attenuation in wavelengths 1530–1610  nm was held to within 9.9–10.2  dB (3% variation) and the fluctuation of attenuation was less than 0.1  dB with 1-W input power for 100  h.

© 2001 Optical Society of America

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