100 Gbit/s (10 × 10 Gbit/s) Y-00 cipher transmission over 120 km for secure optical fiber communication between data centers

For secure and high capacity inter-data center link, WDM transmission experiment of 100-Gbit/s cipher is demonstrated using Y-00 protocol with 64-level intensity modulation. Error-free transmission in 120-km amplifier repeated fiber link is successfully achieved.

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