Title :
High-Spectral-Efficiency Optical Modulation Formats
Author :
Winzer, Peter J.
Author_Institution :
Bell Labs., Alcatel-Lucent, Holmdel, NJ, USA
Abstract :
As 100-Gb/s coherent systems based on polarization- division multiplexed quadrature phase shift keying (PDM-QPSK), with aggregate wavelength-division multiplexed (WDM) capacities close to 10 Tb/s, are getting widely deployed, the use of high-spectral-efficiency quadrature amplitude modulation (QAM) to increase both per-channel interface rates and aggregate WDM capacities is the next evolutionary step. In this paper we review high-spectral-efficiency optical modulation formats for use in digital coherent systems. We look at fundamental as well as at technological scaling trends and highlight important trade-offs pertaining to the design and performance of coherent higher-order QAM transponders.
Keywords :
channel capacity; optical communication equipment; optical design techniques; optical modulation; quadrature amplitude modulation; quadrature phase shift keying; transponders; wavelength division multiplexing; PDM-QPSK; aggregate WDM capacities; aggregate wavelength-division multiplexed capacities; bit rate 100 Gbit/s; coherent higher-order QAM transponders; digital coherent systems; high-spectral-efficiency optical modulation formats; high-spectral-efficiency quadrature amplitude modulation; per-channel interface rates; polarization-division multiplexed quadrature phase shift keying; technological scaling; Coherence; Digital signal processing; Modulation; OFDM; Quadrature amplitude modulation; Wavelength division multiplexing; Coding; DSP; FEC; PDM; QAM; QPSK; SDM; WDM; coherent detection; digital signal processing; modulation;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2012.2212180
