Based on the summarization of the key technology of 100G transmission system, it discusses the long distance transmission performance of 100G technology, analyzes 100G transmission engineering application, and presents the issues need further research on large-scale application.% 在总结100G传输系统关键技术的基础上，对100G技术长距传输性能进行了探讨，同时针对100G技术传输工程应用进行了分析，并提出了大规模应用时需进一步研究的应用问题。
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