The estimated communication traffic growth is 2 dB per year, or an increase of a factor of 100 in traffic in 10 years. ![]() 100 Gb/s channel data rate is considered the next-generation standard for Ethernet (see, for example, IEEE P802.3ba 40 Gb/s and 100 Gb/s Ethernet Task Force, ). In most optical transmission systems, channel data rate has completed the migration from 2.5 Gb/s to 10 Gb/s, and 40 Gb/s is under active development. Dense wavelength-division-multiplexing (DWDM) is now widely used to support high capacity per fiber link, and further expansion in capacity is being achieved by increasing the data rate per wavelength channel. Optical transmission systems have been evolving dramatically over the past decade in order to meet the ever-increasing demand in telecommunication capacity. ![]() Xiang Liu, in Optically Amplified WDM Networks, 2011 3.1 Introduction
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