Title :
Performance Study of 100-Gb/s Super-Nyquist QPSK and Nyquist 8QAM over 25-GHz Spacing
Author :
Shaoliang Zhang ; Yue-Kai Huang ; Yaman, Fatih ; Inada, Yoshihisa
Author_Institution :
NEC Labs. America, Inc., Princeton, NJ, USA
Abstract :
To enable a 100 Gb/s over 25-GHz long-haul transmission solution, Nyquist 8-ary quadrature-amplitude modulation (QAM) and super-Nyquist quadrature phase-shifted keying (QPSK) are promising candidates. Nyquist 8QAM is experimentally demonstrated to have slightly better nonlinear tolerance than super-Nyquist QPSK at the same bit rate. The super-Nyquist QPSK signal suffers higher performance fluctuation depending on bandwidth squeezing.
Keywords :
nonlinear optics; optical communication equipment; quadrature amplitude modulation; quadrature phase shift keying; Nyquist 8-ary quadrature-amplitude modulation; Nyquist 8QAM; bandwidth 25 GHz; bandwidth squeezing; bit rate 100 Gbit/s; higher performance fluctuation; long-haul transmission solution; nonlinear tolerance; superNyquist QPSK signal; superNyquist quadrature phase-shifted keying; Bandwidth; Finite impulse response filters; Maximum likelihood estimation; Phase shift keying; Receivers; Signal to noise ratio; 8QAM; DSP; MLSE; QPSK; Super-Nyquist; long-haul; super-Nyquist;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2425352
