121.9-Gb/s PDM-OFDM Transmission With 2-b/s/Hz Spectral Efficiency Over 1000 km of SSMF

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A Survey on OFDM-Based Elastic Core Optical Networking (2013, background): “These two schemes are described as single-band O-OFDM and multi-band OOFDM, respectively [24].”
PAM-DMT for Intensity-Modulated and Direct-Detection Optical Communication Systems (2009, background): “Recently, the use of OFDM and DMT has also been proposed for a range of optical systems including single-mode fiber, multimode fiber, and optical wireless [1]–[4].”
OFDM for Next-Generation Optical Access Networks (2012, background): “For more information on I/Q imbalance compensation, the reader is referred to [1], [4].”
1-Tb/s Single-Channel Coherent Optical OFDM Transmission With Orthogonal-Band Multiplexing and Subwavelength Bandwidth Access (2010, methodology): “100-Gb/s CO-OFDM transmission has also been demonstrated using multi-band OFDM to mitigate DAC/ADC electronic bottleneck [8], [9].”
On QoS mechanism profiling in MPLS-TP transport networks (2010, background): “These fibers, together with advanced optical amplification systems and coherent detection, provide a very interesting experimental demonstration of high capacity transmissions over ultra-long distances [14, 15, 17, 26].”