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 dispersion at . By coupling to the desired higher-order mode with low-loss in-fiber gratings, we realize a long fiber module with a dispersion that yields a bandwidth of with an insertion loss of at the center wavelength of . We demonstrate its functionality as a critical enabler for an all-fiber, Yb-based, mode-locked femtosecond ring laser.
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