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19 November 2007 Next generation terabit-class transmission systems
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Proceedings Volume 6783, Optical Transmission, Switching, and Subsystems V; 67830C (2007)
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China
While today's WDM optical networks are mostly based on 10Gbit/s data, modulated according to the non-return-to-zero format and offer sub-Terabit/s capacities, networks at 40Gbit/s and beyond will likely use more complex modulation formats, possibly involving more than 1 bit/symbol, for compatibility with the 50GHz channel spacing grid. For these formats, two types of detection schemes can be considered: differential detection, or coherent detection. With differential detection, we demonstrated 25.6Tb/s transmission over 240km, using 160 WDM channels on a 50GHz grid, each containing two polarization-multiplexed 85.4Gb/s RZ-DQPSK signals. But coherent detection appears as an even more promising technique for such multilevel formats, to reach higher transmission distances. It provides the real and imaginary parts of the signal, at the expense of larger complexity and cost. These drawbacks should be weighted by the promises offered by the technique when combined with advanced digital signal processing (DSP). DSP not only solves some severe implementation issues, but also holds in store a tremendous potential against fiber impairments. In this paper, we will focus on coherent detection solution and will demonstrate experimentally that a coherent receiver involving DSP can mitigate distortions from chromatic dispersion, polarization-mode-dispersion and narrow optical filtering, even after several thousand kilometers of fiber for 40 and 80Gb/s-modulated channels, thereby paving the way for higher-capacity, longer-reach transparent optical networks, eventually taking advantage of efficient Polarization Division Multiplexing
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J.-C. Antona, G. Charlet, and S. Bigo "Next generation terabit-class transmission systems", Proc. SPIE 6783, Optical Transmission, Switching, and Subsystems V, 67830C (19 November 2007);


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