Title :
1-Gsymbol/s 64-QAM Coherent Optical Transmission Over 150 km
Author :
Hongo, Jumpei ; Kasai, Keisuke ; Yoshida, Masato ; Nakazawa, Masataka
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai
fDate :
5/1/2007 12:00:00 AM
Abstract :
Quadrature amplitude modulation (QAM) is an excellent modulation format for realizing optical communication systems with a high spectral efficiency of much greater than 1bit/s/Hz. We describe QAM coherent optical communication that we achieved by using heterodyne detection with a frequency-stabilized fiber laser and an optical phase-locked loop (OPLL) technique. The phase error variance of the intermediate frequency signal of the OPLL was 6.1times10-3 rad. A 1-Gsymbol/s 64-QAM coherent signal was successfully transmitted over 150km
Keywords :
heterodyne detection; laser frequency stability; light coherence; optical fibre communication; optical modulation; optical phase locked loops; optical transmitters; quadrature amplitude modulation; 150 km; coherent optical communication; coherent optical transmission; fiber laser; frequency-stabilized laser; heterodyne detection; intermediate frequency signal; modulation format; optical communication systems; optical phase-locked loop; phase error variance; quadrature amplitude modulation; Amplitude modulation; Frequency; High speed optical techniques; Optical fiber communication; Optical mixing; Optical modulation; Optical transmitters; Optical variables control; Phase shift keying; Quadrature amplitude modulation; Coherent transmission; frequency-stabilized laser; optical phase-locked loop (OPLL); quadrature amplitude modulation (QAM); spectral efficiency;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.894944
