11 x 224 Gb/s POLMUX-RZ-16QAM transmission over 670 km of SSMF with 50-Ghz channel spacing

We demonstrate the generation and transmission of eleven channels with 224-Gb/s polarization-multiplexed, return to zero, 16-level quadrature amplitude modulation (POLMUX-RZ-16QAM) over 670 km of standard single mode fiber (SSMF) with 50-GHz channel spacing and a spectral efficiency of 4.2 b/s/Hz. We report a penalty of around 4.3 dB in the performance at back-to-back in comparison to the theoretical limits, and a margin of 1 dB in Q-factor below the forward error correction (FEC) limit (assumed to be at a bit error rate of 3.8x10-3) after transmission over 670 km of SSMF

Experimental investigation of self coherent optical OFDM systems using fabry-perot filters for carrier extraction

We experimentally demonstrate self coherent optical OFDM transmission with IQ demultiplexing employing a Fabry-Perot-tunable filter for the extraction of the optical carrier. The performance is investigated and compared to a conventional CO-OFDM

10x224-Gb/s POLMUX-16QAM transmission over 656 km of large-Aeff PSCF with a special efficiency of 5.6 b/s/Hz

We demonstrate the successful transmission of 10 channels with 224-Gb/s POLMUX-16QAM modulation (28 GBaud) on a 37.5-GHz wavelength grid. Using large-Aeff pure-silica-core fibers we show a 656-km transmission distance with a spectral efficiency of 5.6 b/s/Hz. We report a back-to-back performance penalty of 3.5 dB compared to theoretical limits at the forward-error correction (FEC) limit (bit-error rate of 3.8·10-3), and a margin of 0.5 dB in Q-factor with respect to the FEC-limit after 656 km of transmission

The capacity crunch challenge: how to design the next generation of ultra-high capacity transmission systems

Next-generation optical transmission systems are edging closer and closer to forecasted capacity limits. In this paper we sketch a number of technologies that could potentially help to delay the ultimate truth of Shannon’s capacity limit

40G/100G long-haul optical transmission system design using coherent receivers

The rise of coherent detection and digital signal processing is drastically changing the design of optical transmission systems. In this paper we review the challenges and opportunities offered by such receivers in the design of long-haul 40 G/100 G systems

224-Gb/s polmux-rz-16qam for next generation high capacity optical transmission systems

In this paper, we study the 224-Gb/s polarization multiplexed, return to zero, 16-level quadrature amplitude modulation (POLMUX-RZ-16QAM) as a candidate for next generation high capacity optical transmission systems. We discuss the main challenges associated with the generation of such multi-level optical modulation format. Furthermore, we demonstrate the generation and transmission of eleven 224-Gb/s POLMUX-RZ-16QAM channels over a transmission distance of up to 1500 km with a spectral efficiency of 4 b/s/Hz. Finally, we give our outlook on how future optical systems will evolve to realize data rates beyond 200 Gb/s per channel

Solutions for 100-Gbit ethernet

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Impact of mechanical vibrations on laser stability and carrier phase estimation in coherent receivers

Coherent communication systems are largely limited by the laser linewidth of the local oscillator. In addition to phase noise, large frequency deviations can occur if the laser is mechanically vibrated. The detrimental effect of the frequency instability is measured for coherent optical receivers on a typical laser and numerically analyzed for quadrature phase-shift keying and 16-quadrature amplitude modulation using common feed-forward carrier phase recovery algorithms