Leaky channel fiber design for large mode area high power application at 1 micron

Abstract

We have proposed a germanium doped core fiber design for large mode area single-mode applications. The designed fiber effective index, dispersion and bend loss of the fundamental mode and next higher order modes have been calculated using the numerical method. The fiber exhibits a high differential loss between the fundamental mode and higher order modes. Therefore, the designed fiber structure effectively suppresses the higher order modes and retains only the first mode (or fundamental mode) in the core region. Our simulation results demonstrate that, a low loss of 0.1dB/m is achieved for fundamental mode at 1060nm wavelength with 10cm bend radius, along with it also exhibits a high loss of 4.8 dB/m to first higher order mode. The fiber shows a large mode area of 831.4 μm