Grid Job Routing Algorithms - Phosphorus

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Grid Job Routing AlgorithmsFigure 6.2: PHOSPHORUS testbed performance under PMD impairment for various loads.Currently, network designers utilize two types of amplifiers: semiconductor optical amplifiers (SOAs) anderbium doped fiber amplifiers (EDFAs). SOAs are cheaper and smaller devices than EDFAs; however, they arecharacterized by bigger noise figure and thus bigger n sp values. Typical SOAs are characterized by n sp valuesup to slightly less than 7, while typical EDFAs are characterized by n sp values in the range between 1.5 and 3.Considering Figure 6.2 and Figure 6.4, the ASE noise effect seems negligible at G=17.5 dB with FEC, whilewhen FEC is not used the ASE noise effect becomes an issue even at G=17.5 dB. Generally, the performanceof the network is not satisfactory when FEC is not used and for this reason we won’t analyze it further here. ForG=17.5 dB with FEC, the performance curve rises at n sp = 4, denoting that the network’s throughput divertsfrom 100% in presence of 35 or more such SOAs per path. By increasing G to 20 dB the curve rises at n sp =3,indicating that an average placement of 26 or more SOAs of n sp =3 per path leads to positive blockingprobability, and rises up to 40% for n sp = 5 that corresponds to an average placement of 16 such SOAs perpath. At G=22.5 dB and FEC, the curve rises almost from the beginning (at n sp =2), indicating that an averageplacement of 22 or more such SOAs per lightpath is required to yield to a non zero blocking probability. AtG=25 dB and FEC, more than 20% of the requested connections are blocked, even in presence of a sufficientlylarge number of wavelengths and SOAs with optimal noise figures (for n sp =1.5 we have 16 amplifiers), and 12Project:PHOSPHORUSDeliverable Number: D.5.3Date of Issue: 31/06/07EC Contract No.: 034115Document Code: Phosphorus-WP5-D5.358
Grid Job Routing Algorithmsamplifiers of n sp = 2 per path is sufficient to cause a blocking probability greater than 45%. The blockingprobability curve reaches its maximum value of 75%, when any amplifier of at least n sp =4 is placed on eachpath.Notice that when utilizing FEC techniques with EDFAs (instead of SOAs) with noise figures that approach thefundamental quantum limit we are able to utilize the gain of 20 dB, without causing any degradation to ournetwork’s performance.Figure 6.3: PHOSPHORUS testbed performance under ASE noise impairment for various loads. No FEC isused.Project:PHOSPHORUSDeliverable Number: D.5.3Date of Issue: 31/06/07EC Contract No.: 034115Document Code: Phosphorus-WP5-D5.359
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034115PHOSPHORUSLambda User Control
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List of ContributorsGeorge Markidis
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Grid Job Routing Algorithms6.1.1 Ph
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