8 Realization of HDWDM Transmission System with the Minimum Allowable Channel Interval Jurgis Porins, Vjaceslavs Bobrovs and Girts Ivanovs Riga Technical University, Institute of Telecommunications Latvia 1. Introduction Nowadays, a skyrocketing growth is observed worldwide in the bit rates of transmitted information, which is associated with development of broadband information transmission types. The annual global internet protocol (IP) traffic will exceed half a Zettabyte in four years. At just under 44 Exabytes per month, the annual run rate of traffic in the late 2012 will be 522 Exabytes per year. Driven by high-definition video and high-speed broadband penetration, the consumer of IP traffic will bolster the overall IP growth rate so that it sustains a steady growth rate through 2012, growing at a compound annual growth rate (CAGR) of 46 percent (see Fig. 1) [Cisco Systems, 2008]. Fig. 1. Global IP Traffic Forecast (2006–2012) [Cisco Systems, 2008]. In turn, to provide high-quality transmission it is necessary to develop the next generation optical networks (NGONs) that would transmit properly huge volumes of information. The optical transmission systems from the very outset have been able to offer new possibilities for solving problems of ever increasing urgency that are dictated by the need for frequency bands and transmission speed. Such networks have become one of the most important 2006 2007 2008 2009 2010 2011 2012 0 10 20 30 40 50 Year Petabytes per month CAGR 46% www.intechopen.com