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Enhancement of Unrepeatered Transmission Efficiency Incorporating Double-pass Remotely-pumped Optical Amplifier

In this paper, the efficiency of unrepeatered transmission systems has been investigated using double-pass Erbium-doped fiber amplifiers. It has been proven that the requirement of pump powers for double-pass optical amplifiers is 45% lower compared to its counterpart of single-pass optical amplifier. This shows that the double-pass amplifier provides higher received signal power at the receiving-end even though that the noise figure is deteriorated.