Abstract
We report a hollow-core photonic crystal fiber that is engineered so as to strongly suppress higher-order modes, i.e., to provide robust single-mode guidance in all the wavelength ranges where the fiber guides with low loss. Encircling the core is a single ring of nontouching glass elements whose modes are tailored to ensure resonant phase-matched coupling to higher-order core modes. We show that the resulting modal filtering effect depends on only one dimensionless shape parameter, akin to the well-known parameter for endlessly single-mode solid-core PCF. Fabricated fibers show higher-order mode losses some higher than for the mode, with losses in the near-infrared and a spectral flatness over a bandwidth.
© 2016 Optical Society of America
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