Huawei launches 400G WDM prototype

Huawei has launched 400G WDM prototype for ultra-long-haul transmission at the OFC 2014 Conference.

The innovative prototype employs Faster Than Nyquist (FTN) technology to increase the 400G transmission distance beyond 3,000 km, representing a significant breakthrough in the high-speed WDM transmission field.

Huawei’s FTN technology breaks the limit of the Nyquist sampling theorem, which defines a maximum transmission speed for a fixed channel bandwidth. By utilizing spectrum compression and signal distortion compensation algorithms, the FTN technology achieves long-haul transmission of high baud-rate signals on existing networks.

The technology enables two types of 400G WDM solutions based on 100GHz channel spacing — a short-haul solution and the ultra-long-haul solution unveiled at OFC 2014. The ultra-long-haul solution, which applies to backbone transmission, adopts 2SC-PDM-QPSK modulation and supports a record transmission distance of over 3,000 km.

The short-haul solution, which applies to metropolitan area network (MAN) transmission, adopts 1SC-PDM-16QAM modulation and allows high-quality 400G transmission over a single carrier wave. Huawei’s single-carrier 400G solution was recently tested on EXATEL’s live network in Poland.

“Huawei has been investing heavily in the high-speed WDM field. The new FTN technology introduced in the prototype exceeds traditional technological limits to deliver ultra-long-haul 400G transmission, breaking new ground for the 400G industry,”said Jack Wang, president, Huawei transmission network product line.

In March 2013, Huawei unveiled a 40T WDM prototype, the highest capacity in the industry, at the OFC/NFOEC 2013 event in the US. In December 2013, Huawei and EXATEL Poland completed the world’s first field trial of a single-carrier 400G system. The 400G WDM prototype unveiled at OFC 2014 again demonstrates that operators’ existing optical network infrastructure has the potential to achieve ultra-long-haul transmission of 400 Gbps or even 1 Tbps signals.

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