Journal
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
Volume 4, Issue 10, Pages 715-723Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOCN.4.000715
Keywords
Communication systems; Optical fiber communication; Pulse shaping methods; Quadrature amplitude modulation
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Funding
- Karlsruhe School of Optics and Photonics (KSOP)
- German Research Foundation (DFG)
- Xilinx University Program (XUP)
- Agilent University Relations Program
- European Network of Excellence EuroFOS
- European Research Project ACCORDANCE
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We demonstrate single-laser 32.5 Tbit/s 16QAM Nyquist wavelength division multiplexing transmission over a total length of 227 km of SMF-28 without optical dispersion compensation. A number of 325 optical carriers is derived from a single laser and encoded with dual-polarization 16QAM data using sinc-shaped Nyquist pulses. As we use no guard bands, the carriers have a spacing of 12.5 GHz equal to the symbol rate or Nyquist bandwidth of the data. We achieve a net spectral efficiency of 6.4 bit/s/Hz using a software-defined transmitter, which generates the electric drive signals for the electro-optic modulator in real time.
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