Abstract

We demonstrate an all-solid (nonholey), silica-based fiber with anomalous dispersion at wavelengths where silica material dispersion is negative. This is achieved by exploiting the enhanced dispersion engineering capabilities of higher-order modes in a fiber, yielding +60psnmkm dispersion at 1080nm. By coupling to the desired higher-order mode with low-loss in-fiber gratings, we realize a 5m long fiber module with a 300fsnm dispersion that yields a 1dB bandwidth of 51nm with an insertion loss of 0.1dB at the center wavelength of 1080nm. We demonstrate its functionality as a critical enabler for an all-fiber, Yb-based, mode-locked femtosecond ring laser.

© 2006 Optical Society of America

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