@techreport{TD:101176,
	att_abstract={{As network traffic continues to increase exponentially, the IEEE is mulling a faster Ethernet standard (400 Gb/s) to send even more data over the network—good news for content providers. 

Network providers, responsible for delivering all this data, will need to increase capacity. With spectrum fairly well-utilized, finding more capacity will entail tradeoffs. To understand those tradeoffs, AT&T Researchers tested a novel method that tunes the modulation spectral efficiency for each specific link, in the process setting a distance record (12000 km) for high spectral efficiency (4.125 bit/s/Hz) over the existing 100-GHz optical grid.}},
	att_authors={lc0991, xz8628, ln4395, pm1519},
	att_categories={C_NSS.8},
	att_copyright={{}},
	att_copyright_notice={{}},
	att_donotupload={},
	att_private={false},
	att_projects={},
	att_tags={Optical,  fiber,  transmission,  modulation,  coherent,  QAM,  tunable spectral efficiency},
	att_techdoc={true},
	att_techdoc_key={TD:101176},
	att_url={http://web1.research.att.com:81/techdocs_downloads/TD:101176_DS1_2013-05-13T19:22:37.164Z.pdf},
	author={Linda Crane and Xiang Zhou and Lynn Nelson and Peter Magill},
	institution={{AT&T Research website}},
	month={May},
	title={{For the Long Haul:  Maximizing Transmission Distances for 400Gb/s Signals over the Existing Grid 
}},
	year=2013,
}