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Optical Fiber Communication Conference

Recent progress on optical soliton communication and future prospects

Masataka Nakazawa

Published Jan 1, 1992• 0 citations
Publisher

Abstract

In 1989 it was shown that erbium-doped fiber amplifiers (EDFAs)1 are useful for soliton amplification and transmission.2 It was also shown that a lumped amplifier technique which uses EDFAs made it possible to move the dream of soliton communication into the developmental stage.3
DOI
10.1364/ofc.1992.wc1

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The transmission distance of optically repeating systems is ultimately bounded by quantum noises arising from attenuation and amplification. It is known that fiber Raman amplifiers (FRAs) can achieve longer quantum-limited distances than other amplification schemes owing to their distributed amplification characteristics. However, all-FRA systems are difficult to implement in practice. Therefore, a hybrid erbium-doped fiber amplifier (EDFA)/FRA system may be a reasonable solution for long-haul transmission. In this study, the quantum-limited transmission distance of hybrid EDFA/FRA systems is investigated. A formula for the quantum fluctuation variance during transmission was derived based on quantum mechanical treatment. Calculation results obtained with the derived formula quantitatively indicate that the quantum-limited transmission distance increases as the EDFA/FRA hybrid ratio varies from EDFAs alone to FRAs alone.