Upgrading undersea communication systems beyond their design capacity is an attractive alternative to deploying new cables and increasing the bitrate is an obvious way to facilitate this. Nevertheless, this comes with tightened performance requirements, such as reduced noise and dispersion tolerance, which will reduce any available margins. Applying new modulation formats is a route to mitigate this effect. This paper discusses the technical challenges for carrying out upgrades, either as overlays or on dark fibres, and also presents recent research results on how to add capacity to systems currently operating with Nx10.7 Gbit/s RZ-ASK signals over transoceanic distances. Experiments and simulations are used to analyse performance and limitations, with 20 Gbit/s RZ-DPSK being a strong candidate for upgrades.
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机译：升级UnderseA的通信系统超出其设计能力是一种有吸引力的替代方案，可以部署新电缆，并增加比特率是一种显而易见的方法。尽管如此，这具有紧固性能要求，如降低噪声和色散耐受性，这将减少任何可用的边距。应用新的调制格式是减轻此效果的路由。本文讨论了升级的技术挑战，如覆盖物或黑暗纤维，也呈现了如何为目前使用NX10.7 Gbit / S RZ-AST信号提供对目前经过的传球距离的系统的研究结果。实验和模拟用于分析性能和限制，20 Gbit / s Rz-DPSK是一个强大的升级候选者。
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