WDM system with maximum spectrum efficiency. Free Technical Library News

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WDM system with maximum spectrum efficiency

02.06.2012

Huawei has unveiled a prototype WDM system, which is an upgraded version of 50GHz fixed-spaced commercial equipment. According to the company, the prototype WDM system has the highest spectrum efficiency among existing WDM solutions. It supports various channel spacing with a minimum spacing of 12,5GHz, which not only improves the spectrum efficiency and flexibility of the WDM system, but also lays the foundation for multi-carrier and next-generation optical networks with speeds above 100G and adjustable bandwidth. . This highly efficient spectrum technology will enable operators to build WDM networks that meet the needs of subscribers in the future.

The popularity of broadband services has led to a rapid increase in transmission capacity and accelerated the transition to 100G systems. Providers are now targeting technologies above 100G WDM with multi-carrier support, also known as 400G and 1T transmission solutions. All current WDM systems have 50 or 25 GHz channel spacing, such spectrum efficiency is not sufficient for 400G or 1T multi-carrier transmission networks. Huawei's new WDM prototype improves spectrum efficiency in large capacity WDM systems. This compact solution will provide denser placement of high-speed carrier channels and more complete use of the optical fiber's spectral resource.

WDM prototype supports 40G, 100G, 400G and 1T simultaneous transmission. In addition, it is compatible with legacy systems with 50 or 25 GHz channel spacing. In practice, this means a smooth upgrade from 40G and 100G systems to 400G and 1T systems with effective investment protection for existing networks.

Spectrum Efficiency Technology is one of the core technologies of next-generation optical networks with adjustable bandwidth. The signals of such networks provide automatic adjustment of the modulation mode and transmission rate depending on the length of the line and service capacity, as well as a constant change in the range of the spectrum used. The 12,5 GHz step provides more flexible bandwidth, transmission distance and frequency range, which frees up frequency resources for data transmission.

Jack Wang, president of Huawei's transport network equipment division, said, "The creation of the world's first 10 petabit optical switch prototype and 400G DWDM prototype allowed users to take a look at next-generation optical networks with a high spectral efficiency WDM system prototype. Huawei is focused on creating innovative optical network solutions, which makes a significant contribution to the development of next-generation broadband networks and optical data transmission technologies."

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