Designing of endlessly single mode polarization maintaining highly birefringent nonlinear micro-structure fiber at telecommunication window by FV-FEM

An endlessly single mode highly polarization maintaining nonlinear microstructure fiber at telecommunication window is reported via full-vector finite element method. By taking three ring hexagonal PCF with suitable fiber parameter such as air hole diameter in cladding region d = 0.8 μm, pitch 2.3 μm and introducing four symmetrical large air holes near core region d′ = 2 μm, single mode (Veff ≤ π), small effective mode area 2.7 μm2, nonlinear co-efficient 44.39 W−1 km−1, high phase birefringence of the order of 10−3 and group birefringence of the order of 10−4 with beat length 0.3 μm at wavelength 1.55 μm are achieved.