Title :
Spectral efficiency enhancement using coherent WDM with multi-level offset-QAM
Author :
Zhao, J. ; Ellis, A.D.
Author_Institution :
Photonic Syst. Group, Univ. Coll. Cork, Cork, Ireland
Abstract :
We propose offset-QAM based CoWDM, and show that the proposed system outperforms no-guard-interval optical OFDM and Nyquist WDM and enables the use of offset 4-, 16-, and 64-QAM with the performance approaching the theoretical limits.
Keywords :
quadrature amplitude modulation; spectral analysis; wavelength division multiplexing; CoWDM; Nyquist WDM; QAM; coherent WDM; multilevel offset QAM; no guard interval optical OFDM; spectral efficiency enhancement; OFDM; Optical amplifiers; Optical attenuators; Optical filters; Optical receivers; Optical transmitters; Optical variables control;
Conference_Titel :
Optical Communication (ECOC), 2011 37th European Conference and Exhibition on
Conference_Location :
Geneva
Print_ISBN :
978-1-4577-1918-9
