Novel Passive Polarization Rotator Based on Spiral Photonic Crystal Fiber

In this letter, a novel design of a passive ultra-compact polarization rotator based on soft glass equiangular spiral photonic crystal fiber (ES-PCF) is proposed and analyzed using full vectorial finite difference approaches. The suggested ES-PCF has eight arms with a central elliptical air hole, which can be shifted in <formula formulatype="inline"><tex Notation="TeX">$x$</tex> </formula> and <formula formulatype="inline"><tex Notation="TeX">$y$</tex> </formula> directions to achieve complete polarization conversion. In addition, the major axis of the elliptical hole is rotated by 45<formula formulatype="inline"> <tex Notation="TeX">$^{\circ}$</tex></formula>, which offers 99% polarization conversion ratio with ultra-compact device length of 96 <formula formulatype="inline"> <tex Notation="TeX">$\mu{\rm m}$</tex></formula>. It is also evident from the numerical results that the polarization rotation would be more than 98% over the 1.5–1.6 <formula formulatype="inline"><tex Notation="TeX">$\mu{\rm m}$</tex></formula> wavelength range.

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