Transmission of 96×100G pre-filtered PDM-RZ-QPSK channels with 300% spectral efficiency over 10,608km and 400% spectral efficiency over 4,368km

Dan, Cai; Davidson,; Foursa,; Lucero,; Sinkin,; Patterson, Mark; Pilipetskii,; Mohs,; Bergano,

doi:10.1364/ofc.2010.pdpb10

Cited by 29 publications

(23 citation statements)

References 2 publications

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“…Although the crosstalk is deterministic, to the victim channel it appears as uncorrelated noise and is very difficult to mitigate. One solution is the use of an optical or electrical pre-filter that is applied to each of the transmitted channels before they are optically combined for transmission [9], [10]. Fig.…”

Section: Using Optical Filter To Increase Sementioning

confidence: 99%

Spectral Shaping in Long Haul Optical Coherent Systems With High Spectral Efficiency

Mazurczyk

2014

J. Lightwave Technol.

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One of the main obstacles faced when decreasing channel spacing in optical wavelength division multiplexing (WDM) systems is the linear crosstalk resulting from spectral overlap between neighboring channels. Methods of reducing channel bandwidth and corresponding crosstalk using optical pre-filtering are reviewed along with the limitations of these techniques. High speed transmitter side digital signal processing (DSP) and digitalto-analog converters enable the use of more powerful techniques that precisely shape and limit the bandwidth of the transmitted optical signal. These techniques allow channel spacing to be reduced to nearly the theoretical minimum Nyquist spacing with only negligible crosstalk penalty. We review well known principles of linear modulation theory and apply them to coherent optical transmission systems to describe the desired channel transmit spectra along with the associated transmit and receive DSP. The implementation issues of a typical optical transmitter, which uses these techniques, are discussed. Experimental results of a laboratory long-haul WDM optical system using spectrally shaped PDM-16-QAM type modulation are presented demonstrating near Nyquist channel spacing on a trans-pacific length system with more than 44 terabits of capacity. We also present an additional application of these spectral shaping techniques, which can carefully expand the bandwidth of the transmitted channels to reduce non-linear transmission penalties. Experimental results show the advantages of these spectral broadening techniques and their ability to trade spectral efficiency for increased reach.

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Section: Using Optical Filter To Increase Sementioning

confidence: 99%

Spectral Shaping in Long Haul Optical Coherent Systems With High Spectral Efficiency

Mazurczyk

2014

J. Lightwave Technol.

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“…Narrowband signal generation utilizing digital filters and digital-toanalog converters (DACs) were demonstrated to reduce the crosstalk from adjacent channels [11], [13] at the baud rate below 10.7 Gbaud. In higher baud rate systems, optical filtering techniques have been employed [15], [16], and the SE of 4 b/s/Hz was realized in 28-Gbaud PDM QPSK transmission with the aid of maximum a posteriori (MAP) detection [15].…”

Section: Large Capacity Transmission Technologiesmentioning

confidence: 99%

Ultra-High Capacity Optical Transmission Technologies for 100 Tbit/s Optical Transport Networks

Sano

Kobayashi

Yoshida

et al. 2011

IEICE Trans. Commun.

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SUMMARYThis paper describes ultra-high capacity wavelengthdivision multiplexed (WDM) transmission technologies for 100-Tbit/sclass optical transport networks (OTNs). First, we review recent advances in ultra-high capacity transmission technologies focusing on spectrallyefficient multi-level modulation techniques and ultra-wideband optical amplification techniques. Next, we describe an ultra-high capacity WDM transmission experiment, in which high speed polarization-division multiplexed (PDM) 16-ary quadrature amplitude modulation (16-QAM), generated by an optical synthesis technique, in combination with coherent detection based on digital signal processing with pilotless algorithms, realize the high spectral efficiency (SE) of 6.4 b/s/Hz. Furthermore, ultrawideband hybrid optical amplification utilizing distributed Raman amplification (DRA) and C-and extended L-band erbium-doped fiber amplifiers (EDFAs) is shown to realize 10.8-THz total signal bandwidth. By using these techniques, 69.1-Tbit/s transmission is demonstrated over 240-km of pure silica-core fibers (PSCFs). Furthermore, we describe PDM 64-QAM transmission over 160 km of PSCFs with the SE of 9.0 b/s/Hz.

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“…Lately, a substantial research effort has been put into the development of sub-baudrate-spaced channels, where the bandwidth of the pulse shaping filters is decreased below the symbol rate to avoid linear crosstalk [8], [9]. In this scenario, the per-channel bandwidth constraint dramatically increases ISI, so powerful ISI equalization techniques should be employed [8], [10].…”

Section: Introductionmentioning

confidence: 99%

“…In this scenario, the per-channel bandwidth constraint dramatically increases ISI, so powerful ISI equalization techniques should be employed [8], [10]. Another scenario in which ISI dominates is where WDM channels are narrowly filtered due to multiple cascaded reconfigurable optical add-drop multiplexers (ROADM) [11] .…”

Section: Introductionmentioning

confidence: 99%

Decision-Feedback Equalization of Bandwidth-Constrained N-WDM Coherent Optical Communication Systems

Fickers

Ghazisaeidi²,

Salsi³

et al. 2013

J. Lightwave Technol.

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Abstract-Nyquist Wavelength division multiplexing (N-WDM), is a promising scheme in order to enhance the spectral efficiency of future coherent optical communication systems. In N-WDM systems, the channel bandwidth and spacing are selected to maximize the spectral efficiency while maintaining acceptable levels of inter-carrier and inter symbol interference. To further increase the spectral efficiency, bandwidth constrained N-WDM, where baudrate is higher than channel bandwidth can be considered. We propose to combine the bandwidth-constrained N-WDM scheme with a decision feedback equalizer (DFE) designed according to the minimum mean square error (MMSE) criterion. We show that the enhanced resilience to the inter symbol interference offered by DFE provides an effective gain on spectral efficiency. We compare system benefits of DFE and maximum a posteriori sequence detection (MAP) for coherent optical receivers, and show that DFE is as efficient as MAP in mitigating inter symbol interference at a considerably lower complexity.

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Transmission of 96×100G pre-filtered PDM-RZ-QPSK channels with 300% spectral efficiency over 10,608km and 400% spectral efficiency over 4,368km

Cited by 29 publications

References 2 publications

Spectral Shaping in Long Haul Optical Coherent Systems With High Spectral Efficiency

Spectral Shaping in Long Haul Optical Coherent Systems With High Spectral Efficiency

Ultra-High Capacity Optical Transmission Technologies for 100 Tbit/s Optical Transport Networks

Decision-Feedback Equalization of Bandwidth-Constrained N-WDM Coherent Optical Communication Systems

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