As reported by our sister site Lightwave, ZTE Corp. says it has collaborated with China Telecom Corporation Ltd. Beijing Research Institute to send a 1-Tbps signal over a span of 3200 km. The demonstration used a terabit WDM real-time transmission system based on ZTE’s ZXONE 8700 platform.
The optical transmission occurred over G.652 singlemode optical fiber without Raman amplification. That the collaborators maintained this transmission error-free for 24 hours means they set a world record, says ZTE.
The optical transport system reportedly used Nyquist WDM terabit PM-QPSK optical modulation and optical coherent detection technologies, as well as ultra-high-speed signal processing and soft-decision forward error correction algorithms to achieve spectral efficiency of 4 bit/Hz/s.
This is the second major 1-Tbps transmission demonstration ZTE has announced. The company partnered with Deutsche Telekom in early 2012 on a 100G/400G/1T long-haul transmission test over 2450 km. It demonstrated a prototype 400G/1T DWDM prototype system later that year.