Design of triangular core LMA-PCF with low-bending loss and low non-linearity for laser application

• Simple large-mode area photonic crystal fiber using fluorine-doped silica as 1st ring.
• Effective area 1500 µm2 with a low bending loss of 10−5 dB/km at a bending radius of 40 cm.
• The non-linear coefficient of the design is also low.
• A potential candidate for high power fiber laser.

In this paper we characterize the design of a simple large-mode area photonic crystal fiber (LMA-PCF) with low bending loss and low non-linearity. The finite element method (FEM) with perfectly matched boundary layer (PML) is used to investigate the guiding properties. According to simulation the characterized four ring fluorine doped triangular core LMA-PCF achieves 1500 µm2 effective mode area with a low bending loss of 10-5dB/km at the wavelength of 1.064 µm and at a bending radius of 40 cm which is suitable for high power fiber laser.