High-power single-mode trench-assisted EDFA

Abstract

A trench assisted, 0.15-NA, effective single mode leaky Erbium Doped Fiber Amplifier is proposed for high power applications. The segmented-core of the fiber enables to achieve 783 μm2 mode area which reduces nonlinearity and increases power handling capacity of the fiber. The leakage loss of the modes is controlled by annular core segments and low index trench in the cladding. The leakage loss of the LP<inf>11</inf> mode is 10.49 dB/m and that of the fundamental mode is 0.017 dB/m at 1530 nm wavelength. We have injected 20 mW power into each mode and have calculated the gain for 26 m length of the fiber using 250 W pump at 980 nm wavelength. The signal power in the LP01 mode is amplified to 122 W and that in the LP<inf>11</inf> mode drops down to 5.78×10-27W. The low output signal power in LP<inf>11</inf> mode ensures selective single mode amplification of fundamental mode. Selective single mode amplification confirms good beam quality at the output end. © 2015 Copyright SPIE.