Ultrabroadband polarization splitter based on three-core photonic crystal fibers

Abstract

An ultrabroadband polarization splitter based on three-core photonic crystal fiber (PCF) is proposed. Two fluorine-doped cores and an elliptical modulation core are introduced to achieve an excellent performance and an ultrawide bandwidth. Numerical results demonstrate that the polarization splitter based on three-core PCF has an extinction ratio as low as $-20\mathrm{dB}$ bandwidth as great as 400 nm covering almost all communication bands ($O$, $E$, $S$, $C$, and $L$ bands). Its Gaussian-like mode-field distributions and suitable effective mode areas make it highly compatible with the standard single-mode fibers. Due to using a uniform size of circular air holes and only one elliptical central air hole, the difficulty of fabrication can be decreased to some extent.

© 2013 Optical Society of America

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