Broad-band amplification using a novel amplifier topology

A new broad-band amplifier topology that provides a continuous gain across 75 mn (1528-1603 nm) of optical bandwidth using Er3+-doped SiO2 fiber is demonstrated. The noise figure is low and does not present any discontinuity across the entire amplification bandwidth. The topology has a buried 1550/1585-nm splitter to reduce input signal loss and to provide amplified spontaneous emission suppression. The topology has been optimized using hybrid fiber; Er3+-doped SiO2 for the first stage and Er3+-doped TeO2 for the second stage, achieving 82 nm (1526-1618 run) of optical bandwidth.