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 bandwidth as great as 400 nm covering
almost all communication bands (, , , , and 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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