An Extremely Large Mode Area Microstructured Core Leakage Channel Fiber With Low Bending Loss

A technique of mitigating the reduction of mode area in bent large mode area (LMA) fibers by employing higher index rods in one region of the core along with lower index microstructured rods at the opposite region has been presented in this paper. The effective area is further increased by lowering the index difference between the background and some selected rods in the cladding. Apart from this, a very large ratio of higher order mode confinement loss to the fundamental mode confinement loss is achieved to ensure the single modedness. The ingenious techniques have enabled the proposed design to exhibit effective area over 4000 μm
$^{2}$
allied with very low bending loss at the wavelength of 1.064 μm.