Spectral efficient transmission of 8x65.1-Gbit/s PDM-OFDM is reported over 240 km. Using coherent detection and 32-QAM subcarrier modulation the channel spacing is reduced to 8 GHz, allowing a net spectral efficiency of 7.0 bit/s/Hz.
© 2009 Optical Society of America
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4080) Fiber optics and optical communications : Modulation
H. Takahashi, A. Al Amin, S. L. Jansen, I. Morita, and H. Tanaka, "DWDM Transmission with 7.0-bit/s/Hz Spectral Efficiency Using 8x65.1-Gbit/s Coherent PDM-OFDM Signals," in Optical Fiber Communication Conference and National Fiber Optic Engineers Conference, OSA Technical Digest (CD) (Optical Society of America, 2009), paper PDPB7.