ZTE carried a 400 Gbps wavelength over a distance of more than 5,000 km. The test used a WDM system with 100 Ghz channel spacing. Data was transmitted through 25 ROADM nodes without electrical repeaters. ZTE used a unique frequency algorithm to overcome signal degradation.
http://wwwen.zte.com.cn/en/press_center/news/201306/t20130607_399848.html
- In February 2011, ZTE transmitted a single-channel 11.2 Tbps optical signal. It also completed a 641-km transmission at 1 Tbps in standard single-mode fiber.