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基于中国自然科学基金网(NSFCNet)的400 km×10 Gb/s光传输链路实现了40 Gb/s光传输,没有出现误码率(BER)平台,说明在常规的中短距离10 Gb/s系统可以直接升级至40 Gb/s系统,而不需要升级传输链路。但是,由于相对10 Gb/s系统而言40 Gb/s系统的色散容限非常小,在升级时必须精确补偿原有链路的色散,在接收机前一般需要加可调色散补偿单元。同时,还分析了光纤注入功率对系统性能的影响,结果表明在设计这种由10 Gb/s向40 Gb/s升级的系统时,不仅要考虑信号带宽增加带来信噪比要求的提高,而且必须充分考虑光纤非线性的影响。
40 Gb / s optical transmission is achieved with a 400 km × 10 Gb / s optical transmission link based on NSFCNet, and there is no bit error rate (BER) platform, indicating that in the conventional short 10 Gb / s system can be upgraded directly to 40 Gb / s system without the need to upgrade the transmission link. However, due to the very small dispersion tolerance of a 40 Gb / s system relative to a 10 Gb / s system, the dispersion of the original link must be accurately compensated during the upgrade, and an adjustable dispersion compensation unit is generally required before the receiver. At the same time, the influence of optical fiber injection power on the system performance is also analyzed. The results show that when designing a system upgraded from 10 Gb / s to 40 Gb / s, not only the increase of signal-to-noise ratio should be considered, And must fully consider the influence of the optic fiber non-linearity.