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Phase and group modal birefringence of an index-guiding photonic crystal fibre with helical air holes

Institute of Modern Optics, Nankai University, Tianjin 300071, China
Optics Communications (Impact Factor: 1.54). 12/2006; 268(1):46-50. DOI: 10.1016/j.optcom.2006.07.003

ABSTRACT In this paper, we propose a novel photonic crystal fibre (PCF) with high phase birefringence and very low group birefringence. It is composed of a solid silica core and a cladding with helix-pattern air holes. Using a full-vector finite-element method, we study the phase and group modal birefringence of such PCF at various air-hole sizes, pitches and wavelengths. Owing to this innovative structure of air holes, a high phase to group modal birefringence rate is obtained. Its phase modal birefringence is as large as 10−4 magnitude; however, the group modal birefringence of this PCF is at 10−7–10−6. The phase birefringence is 2 orders of magnitude larger than group birefringence over a broad wavelength span, which means that the light with different polarization and effective index has almost a same group velocity. As a result, the group modal birefringence that closely relates to the polarization modal dispersion is negligible.

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