Design of octagonal core micro-cladding leakage channel fiber with low bending loss

Abstract

We design a large mode area (LMA) micro-cladding leakage channel fiber (LCF) with an octagonal shaped core for 1.064 μm wavelength. Our numerical simulation shows that very low bending loss at small bend radius can be achieved by scaling up the micro-cladding elements of LCF. Further, the proposed fiber exhibits novel properties such as large effective area (1287 μm2) and very low bending loss of 5.58 × 10−3 dB/m for a bending radius of 5 cm. These interesting properties of the proposed LCF pave the way for developing a compact high power fiber laser and amplifier.