Highly nonlinear photonic crystal fiber with ultrahigh birefringence using a nano-scale slot core

Abstract

A new type of highly nonlinear birefringent photonic crystal fiber (HNL_PCF) with nano-scale slot core is proposed and numerically simulated. Benefit from the slot effect induced sub-wavelength mode confinement, ultrahigh nonlinear coefficient up to 3.5739×104W−1km−1 can be achieved for the quasi-TM mode at the wavelength of 1.55μm. Additionally, the modal birefringence can go up to 0.5015 due to the asymmetry of the fiber structure. Leveraging the extraordinary features, the proposed HNL-PCF offers large potential in miniature fiber devices for all-optical signal processing.