Broadband robustly single-mode hollow-core PCF by resonant filtering of higher-order modes

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 ${\mathrm{LP}}_{01}$ 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 $d/\mathrm{\Lambda }$ parameter for endlessly single-mode solid-core PCF. Fabricated fibers show higher-order mode losses some $\sim 100$ higher than for the ${\mathrm{LP}}_{01}$ mode, with ${\mathrm{LP}}_{01}$ losses $<0.2\mathrm{dB}/\mathrm{m}$ in the near-infrared and a spectral flatness $\sim 1\mathrm{dB}$ over a $>110\mathrm{THz}$ bandwidth.

© 2016 Optical Society of America

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