Design of simple circular photonic crystal fiber having high negative dispersion and ultra-low confinement loss

Abstract

In this paper, we propose a simple circular photonic crystal fiber (SC-PCF) of silica core having six uniform air-holes and four uniform tiny air-holes arranged at the apexes of square inside the core. The finite element method is used for the numerical analysis of performance parameters. It is found that SC-PCF with four tiny air-holes, i.e., proposed SC-PCF has high negative dispersion of −600.3 ps/nm.km and −366.5 ps/nm.km at 1.3 µm and 1.55 µm operating wavelength, respectively, which is far higher than the previously reported PCFs. The obtained dispersion is highest negative among the air-hole based PCFs. Further, the proposed SC-PCF has ultralow confinement loss of 9.9 × 10−7 dB/cm and 5.13 × 10−5 dB/cm at 1.3 µm and 1.55 µm operating wavelength, respectively, which is far lower than the previously reported PCFs. However, proposed SC-PCF does not show significant improvement in birefringence, i.e. 0.00124 and 0.00145 at 1.3 µm and 1.55 µm operating wavelength, respectively, which is compensated for its high effective area, low coupling loss, and low effective material loss.

Keywords

• Photonic crystal fiber
• Dispersion
• Confinement loss
• Birefringence
• V-Number
• Effective area