Abstract
The present paper proposes a novel design for achieving single-polarization single-mode (SPSM) operation in
photonic crystal fiber (PCF), using a rectangular-lattice PCF with two lines of three central air holes enlarged.
The proposed PCF that is composed entirely of silica material is modeled by a full-vector finite element method with
anisotropic perfectly matched layers. The position of the region of single polarization can be tuned freely by
adjusting the size of the central enlarged air holes. Using this structure, an SPSM PCF with confinement loss less
than 0.1 dB/km within the wavelength range from 1.20 to 1.66 µm and effective mode area about 5.9 µm<sup>2</sup> at
1.55 µm has been successfully designed. The proposed
fiber is a nonlinear SPSM, which may be useful for nonlinear optical applications or applications with a wide SPSM
operating bandwidth requirement.
© 2007 IEEE
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