Endlessly single mode photonic crystal fiber with improved effective mode area

A novel large mode area photonic crystal fiber (PCF) is proposed in this paper. Numerical investigations demonstrate that an endlessly single-mode PCF with improved large mode area can be realised by introducing higher index material in the cladding region. Here we discuss how the V-parameter and effective mode area of the PCF can be improved by manipulating the cladding region rather than the core region itself. Moreover, the influence of doping levels with respect to confinement loss, chromatic dispersion and bending loss of the proposed PCF is also investigated by employing the full-vectorial finite element method (FEM).