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Development Trend of All Optical Network - 2

June 30, 2021

Trend 2: High capacity of all-optical network transmission links

In the direction of DWDM, the current transmission link from the traditional C-band 80 waves can be expanded to C+ band 96 waves and extended C+ band 120 waves at a small cost and technical transformation, and can obtain 20% and 50% expansion gains, and the latest The trend is to expand the C+ band 120 waves and the L+ band 120 waves, a total of 240 waves, and the expansion gain is expected to be as high as 200%. However, Wei Leping also pointed out that the main challenge of this technology trend lies in the trade-off between Nyquist filter compensation and amplifier performance.

In the TDM direction, using the new oDSP, the transmission distance of a single-wave 400Gbps QPSK based on 130G baud can be increased from 600 kilometers to 1500 kilometers, which can cover 99% of the trunk line multiplex section distance. Wei Leping believes that this trend can be realized after 2023 at the earliest.

At the same time, Wei Leping also gave his own suggestions for the near- and mid-term expansion strategy of China's trunk lines. He believes that in theory, we should continue to follow the basic expansion rhythm with a 4-fold capacity step as the main body; in fact, in order to cope with the expansion pressure, upgrading to N×200G is a realistic transition plan.

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