Title :
Challenges to FDM-QAM coherent transmission with ultrahigh spectral efficiency
Author :
Nakazawa, Masataka
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ.
Abstract :
Quadrature amplitude modulation (QAM) is an excellent modulation format for realizing optical communication systems with a high spectral efficiency of much greater that 1 bit/s/Hz. 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.
Keywords :
frequency division multiplexing; heterodyne detection; optical fibre networks; optical phase locked loops; quadrature amplitude modulation; FDM-QAM coherent transmission; frequency division multiplexing; frequency-stabilized laser; heterodyne detection; optical communication systems; optical phase-locked loop technique; quadrature amplitude modulation; ultrahigh spectral efficiency; Frequency division multiplexing; High speed optical techniques; Optical fiber cables; Optical fiber communication; Optical mixing; Optical modulation; Optical solitons; Phase locked loops; Phase shift keying; Quadrature amplitude modulation;
Conference_Titel :
Optical Communication, 2008. ECOC 2008. 34th European Conference on
Conference_Location :
Brussels
Print_ISBN :
978-1-4244-2227-2
Electronic_ISBN :
978-1-4244-2228-9
DOI :
10.1109/ECOC.2008.4729095
