Title :
On the Energy Efficiency of Modulation Formats for Optical Communications
Author :
Khodakarami, Hamid ; Shieh, William
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. of Melbourne, Melbourne, VIC, Australia
Abstract :
An information theoretic framework for performance evaluation of high-dimensional modulation formats in an optical communication link is proposed. The spectral and energy efficiency of different candidates for future coherent optical communications are analyzed to explore the advantages of exploiting different degrees of freedom for symbol coding, construction, and transmission. Our analysis demonstrates the advantage of fully utilizing both polarization states from the spectral and energy efficiency perspective. In particular, at the same spectral efficiencies of 2.5 and 2.8 b/s/Hz, dual polarization quadrature phase shift keying (DP-QPSK) has, respectively, 0.8 and 1.6 dB energy efficiency advantage over polarization switched QPSK (PS-QPSK).
Keywords :
energy conservation; optical links; optical modulation; quadrature phase shift keying; construction; energy efficiency; modulation formats; optical communication link; optical communications; performance evaluation; polarization switched QPSK; symbol coding; transmission; Adaptive optics; Optical fiber communication; Optical modulation; Optical polarization; Optical receivers; Phase shift keying; Achievable rate; dual polarization; energy efficiency; modulation format; optical communications; polarization switched; rate-adaptive forward error correction (FEC);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2235139
