In this contribution, we report on the experimental investigation of an ultra-dense wavelength-di... more In this contribution, we report on the experimental investigation of an ultra-dense wavelength-division multiplexing (UDWDM) upstream link with up to 700 × 2.488 Gb/s polarization-division multiplexing differential quadrature phase-shift keying parallel upstream user channels transmitted over 80 km of standard single-mode fiber. We discuss challenges of the digital signal processing in the optical line terminal arising from the joint reception of several upstream user channels. We present solutions for resource and cost-efficient realization of the required channel separation, matched filtering, down-conversion and decimation as well as realization of the clock recovery and polarization demultiplexing for each individual channel.
ABSTRACT In diesem Beitrag vergleichen wir PDM-QPSK und 6PolSK-QPSK Signale in WDM Ubertragungsex... more ABSTRACT In diesem Beitrag vergleichen wir PDM-QPSK und 6PolSK-QPSK Signale in WDM Ubertragungsexperimenten uber bis zu 5280 km G.652 Einmodenfaser. Dabei werden die beiden Modulationsverfahren bei der gleichen Symbolrate (28 GBd) verglichen. Aufgrund der hoheren spektralen Effizienz von 6PolSK-QPSK Signalen ergibt sich hier ein Bitrate von 126 Gb/s gegenuber 112 Gb/s fur die PDM-QPSK Signale. Dies ermoglicht den Einsatz einer starkeren Vorwartsfehlerkorrektur (FEC) mit grosserem Overhead. In ubertragungsexperimenten wird die erzielbare Verbesserung der Ubertragungsreichweite durch den Einsatz eines zusatzlichen Reed-Solomon FEC Codes quantifiziert. Daruber hinaus diskutieren wir die Wechselwirkung zwischen der FEC und der elektronischen Kompensation nichtlinearer Ubertragungseffekte.
ABSTRACT The performance of the 4-D 128SP-QAM format is experimentally investigated in a Nyquist-... more ABSTRACT The performance of the 4-D 128SP-QAM format is experimentally investigated in a Nyquist-wavelength division multiplexing system for two different forward error correction (FEC) scenarios. Two soft-decisions FEC schemes are experimentally evaluated for 128SP-QAM, namely, a turbo product code (TPC) and a low-density parity-check (LDPC) code. The results show that after full convergence the LDPC code outperforms the TPC with respect to coding gain at a bit error ratio of $10^{mathrm {mathbf {-8}}}$ . However, it requires more decoding iterations to achieve convergence toward an optimum performance state.
We review recent progress in ultrafast transmission systems. Using coherent detection for simulta... more We review recent progress in ultrafast transmission systems. Using coherent detection for simultaneous demultiplexing and demodulation enabled single channel serial 10.2Tb/s transmission over 29km as well as transmission impairment compensation far beyond electronic speed limits.
39th European Conference and Exhibition on Optical Communication (ECOC 2013), 2013
ABSTRACT We discuss technology options for bandwidth-variable transceivers which are key componen... more ABSTRACT We discuss technology options for bandwidth-variable transceivers which are key components for the realization of flexible software-defined optical networking. In particular, we focus on recent advances in four-dimensional modulation formats and in modulation format transparent data-aided digital signal processing.
Optical Fiber Communication Conference and National Fiber Optic Engineers Conference, 2009
It is shown that the impact of interchannel nonlinear effects in wavelength-division multiplexed ... more It is shown that the impact of interchannel nonlinear effects in wavelength-division multiplexed fiber-optic transmission systems depends on channel spacing, the fiber's group-velocity dispersion and its attenuation coefficient, condensed into a single dimensionless parameter.
In this contribution, we report on the experimental investigation of an ultra-dense wavelength-di... more In this contribution, we report on the experimental investigation of an ultra-dense wavelength-division multiplexing (UDWDM) upstream link with up to 700 × 2.488 Gb/s polarization-division multiplexing differential quadrature phase-shift keying parallel upstream user channels transmitted over 80 km of standard single-mode fiber. We discuss challenges of the digital signal processing in the optical line terminal arising from the joint reception of several upstream user channels. We present solutions for resource and cost-efficient realization of the required channel separation, matched filtering, down-conversion and decimation as well as realization of the clock recovery and polarization demultiplexing for each individual channel.
ABSTRACT In diesem Beitrag vergleichen wir PDM-QPSK und 6PolSK-QPSK Signale in WDM Ubertragungsex... more ABSTRACT In diesem Beitrag vergleichen wir PDM-QPSK und 6PolSK-QPSK Signale in WDM Ubertragungsexperimenten uber bis zu 5280 km G.652 Einmodenfaser. Dabei werden die beiden Modulationsverfahren bei der gleichen Symbolrate (28 GBd) verglichen. Aufgrund der hoheren spektralen Effizienz von 6PolSK-QPSK Signalen ergibt sich hier ein Bitrate von 126 Gb/s gegenuber 112 Gb/s fur die PDM-QPSK Signale. Dies ermoglicht den Einsatz einer starkeren Vorwartsfehlerkorrektur (FEC) mit grosserem Overhead. In ubertragungsexperimenten wird die erzielbare Verbesserung der Ubertragungsreichweite durch den Einsatz eines zusatzlichen Reed-Solomon FEC Codes quantifiziert. Daruber hinaus diskutieren wir die Wechselwirkung zwischen der FEC und der elektronischen Kompensation nichtlinearer Ubertragungseffekte.
ABSTRACT The performance of the 4-D 128SP-QAM format is experimentally investigated in a Nyquist-... more ABSTRACT The performance of the 4-D 128SP-QAM format is experimentally investigated in a Nyquist-wavelength division multiplexing system for two different forward error correction (FEC) scenarios. Two soft-decisions FEC schemes are experimentally evaluated for 128SP-QAM, namely, a turbo product code (TPC) and a low-density parity-check (LDPC) code. The results show that after full convergence the LDPC code outperforms the TPC with respect to coding gain at a bit error ratio of $10^{mathrm {mathbf {-8}}}$ . However, it requires more decoding iterations to achieve convergence toward an optimum performance state.
We review recent progress in ultrafast transmission systems. Using coherent detection for simulta... more We review recent progress in ultrafast transmission systems. Using coherent detection for simultaneous demultiplexing and demodulation enabled single channel serial 10.2Tb/s transmission over 29km as well as transmission impairment compensation far beyond electronic speed limits.
39th European Conference and Exhibition on Optical Communication (ECOC 2013), 2013
ABSTRACT We discuss technology options for bandwidth-variable transceivers which are key componen... more ABSTRACT We discuss technology options for bandwidth-variable transceivers which are key components for the realization of flexible software-defined optical networking. In particular, we focus on recent advances in four-dimensional modulation formats and in modulation format transparent data-aided digital signal processing.
Optical Fiber Communication Conference and National Fiber Optic Engineers Conference, 2009
It is shown that the impact of interchannel nonlinear effects in wavelength-division multiplexed ... more It is shown that the impact of interchannel nonlinear effects in wavelength-division multiplexed fiber-optic transmission systems depends on channel spacing, the fiber's group-velocity dispersion and its attenuation coefficient, condensed into a single dimensionless parameter.
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