Abstract

An ultrabroadband polarization splitter based on a modified three-core photonic crystal fiber is proposed. Two fluorine-doped cores and a central microstructured modulation core are introduced to achieve an excellent performance and an ultrawide bandwidth. Numerical simulation demonstrates that the splitter has a bandwidth as wide as 300 nm, with an extinction ratio (ER) as low as 20dB. At the wavelength of 1.55 μm, the ER reaches 30dB. All the air holes in our design are circular holes and are arranged in a triangular lattice that is easy to fabricate with the method of stack and draw. A suitable mode field area and a Gaussian-like mode field distribution lead to a low splicing loss that is as low as 0.04 dB when splicing with standard single-mode fibers as the lead-in and lead-out ports.

© 2013 Optical Society of America

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