Title :
Challenges to FDM-QAM coherent transmission with ultrahigh spectral efficiency
Author :
Nakazawa, Masataka
Author_Institution :
Research Institute of Electrical Communication, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai-shi 980-8577, Japan
Abstract :
I describe recent progress on 1 Gsymbol/s, FDM (Frequency Division Multiplexed)-QAM coherent transmission experiments by using heterodyne detection with a frequency-stabilized laser and an optical phase-locked loop technique. The spectral efficiency reached as high as 10 bit/s/Hz with polarization-multiplexed 128 QAM transmission.
Keywords :
Bit error rate; Frequency division multiplexing; High speed optical techniques; Optical mixing; Optical modulation; Phase detection; Phase frequency detector; Phase shift keying; Quadrature amplitude modulation; Signal processing;
Conference_Titel :
Optical Communication, 2008. ECOC 2008. 34th European Conference on
Conference_Location :
Brussels, Belgium
Print_ISBN :
978-1-4244-2227-2
Electronic_ISBN :
978-1-4244-2228-9
DOI :
10.1109/ECOC.2008.4729190
