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1-Gsymbol/s 64-QAM Coherent Optical Transmission Over 150 km

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4 Author(s)
Jumpei Hongo ; Res. Inst. of Electr. Commun., Tohoku Univ., Sendai ; Keisuke Kasai ; Masato Yoshida ; Masataka Nakazawa

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

Published in:

IEEE Photonics Technology Letters  (Volume:19 ,  Issue: 9 )