We have transmitted a polarization-multiplexed 1-Gsymbol/s, 128 QAM (14-Gbit/s) coherent optical signal over 160 km using a 1.4-GHz Nyquist filter. A heterodyne technique was used between a frequency-stabilized C2H2 laser and high-speed local oscillator.

© 2008 Optical Society of America

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