Abstract
We theoretically investigate the coupling characteristics of a few-mode twin-core all-solid photonic bandgap fiber. We show that extrema in the coupling length, reversal of the ordering of supermodes, and complete decoupling can occur in high-order modes. Using significant differences in the coupling characteristics between different modes, we can separate degenerate mode pairs such as and , and and , as well as modes with the same azimuthal quantum number, e.g., and . By setting a suitable photonic-crystal period, we can realize an optical fiber coupler with mode separation properties in the C-band.
© 2017 Optical Society of America
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