Journal
OPTICS EXPRESS
Volume 21, Issue 7, Pages 8808-8814Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.008808
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Funding
- NNSF of China [61107064, 61177071, 60837004, 61250018]
- NHTRDP (863 Program) of China [2011AA010302, 2012AA011302]
- NKTRDP of China [2012BAH18B00]
- ICPSSTA of Shanghai [12510705600]
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We experimentally demonstrate heterodyne coherent detection of 8 x 112-Gb/s ultra-density wavelength-division-multiplexing (WDM) polarization-division-multiplexing quadrature-phase-shift-keying (PDM-QPSK) signal after 1120-km single-mode fiber-28 (SMF-28) transmission. The spectral efficiency (SE) is 4b/s/Hz. It is the first time to realize WDM signal transmission with high SE by adopting heterodyne coherent detection. At the heterodyne coherent receiver, intermediate frequency (IF) down conversion is realized in digital frequency domain after analog-to-digital conversion. A digital post filter and 1-bit maximum likelihood sequence estimation (MLSE) adopted after carrier phase estimation (CPE) in the conventional digital-signal-processing (DSP) process is used to suppress the enhanced noise and crosstalk as well as overcome the filtering effects. The bit-error ratio (BER) for all channels is under the forward-error-correction (FEC) limit of 3.8 x 10(-3) after 1120-km SMF-28 transmission. (c) 2013 Optical Society of America
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