Multilevel modulation formats are used as the enabling technology to obtain 120 Gbit/s per channel bit rates, and 240 Gbit/s when polarisation multiplexing is added. Using OTDM, this can be extended even further.
Leos Summer Topical Meetings, 2007 Digest of the Ieee, 2007, p. 256-257
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Digest of the IEEE LEOS Summer Topical Meetings, 2007