38.75 Tb/s transmission experiment over transoceanic distance

Salsi, M.; Rios-Müller, Rafael; Renaudier, J.; Tran, P.; Schmalen, Laurent; Ghazisaeidi, Amirhossein; Mardoyan, H.; Brindel, P.; Charlet, G.; Bigo, S.

doi:10.1049/cp.2013.1689

Cited by 32 publications

(20 citation statements)

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“…Also, the impulse response for root-raised cosine filters decays faster with increasing beta, allowing the use of shorter FIR filter lengths. Many published results use RC shapes with very small values of β, indicating that these issues may be surmountable for optical systems [1], [2], [19]. For example, the jitter contributed by currently available hardware may not require modulation formats with increase jitter tolerance.…”

Section: Desired Spectral Shapes For Increased Sementioning

confidence: 99%

“…Similar to optically pre-filtered systems with tight channel spacing laser drift is an important issue, and in this measurement, the laser frequencies were carefully tuned to their correct values. Measurement of the penalties from laser detuning in an N-WDM system are given in [2], and a technique to stabilize the lasers within 3 MHz is given in [30].…”

Section: Measured Performancementioning

confidence: 99%

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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: Desired Spectral Shapes For Increased Sementioning

confidence: 99%

Section: Measured Performancementioning

confidence: 99%

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

Mazurczyk

2014

J. Lightwave Technol.

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“…It is worth noting that super-Nyquist QPSK could reach an even longer distance by assuming soft-decision (SD) FEC [9]. On the other hand, 8QAM has received increased attention due to its potential to improve SE beyond 4 b/s/Hz without severely sacrificing reach [5], [10], [11]. Transoceanic transmission has been demonstrated by using dual-carrier 400G 8QAM with enhanced SD-FEC codes even with >100 km span length [10], [11].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, 8QAM has received increased attention due to its potential to improve SE beyond 4 b/s/Hz without severely sacrificing reach [5], [10], [11]. Transoceanic transmission has been demonstrated by using dual-carrier 400G 8QAM with enhanced SD-FEC codes even with >100 km span length [10], [11]. 8QAM has a much simpler DSP algorithm and transmitter architecture than super-Nyquist QPSK, which demands a sophisticated clock recovery algorithm, MLSE or even soft-output MLSE at the receiver [7], as well as a superNyquist filter at the transmitter.…”

Section: Introductionmentioning

confidence: 99%

Performance Study of 100-Gb/s Super-Nyquist QPSK and Nyquist 8QAM over 25-GHz Spacing

Zhang¹,

Huang²,

Yaman³

et al. 2015

IEEE Photon. Technol. Lett.

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To enable a 100 Gb/s over 25-GHz long-haul transmission solution, Nyquist 8-ary quadrature-amplitude modulation (QAM) and super-Nyquist quadrature phase-shifted keying (QPSK) are promising candidates. Nyquist 8QAM is experimentally demonstrated to have slightly better nonlinear tolerance than super-Nyquist QPSK at the same bit rate. The super-Nyquist QPSK signal suffers higher performance fluctuation depending on bandwidth squeezing.

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“…For example, transoceanic transmission using C+L bands has been demonstrated to provide significant increases in capacity and bandwidth [1][2][3] . Alternatively, hybrid Raman-EDFA designs can offer improved OSNR and longer repeater spacing while providing broad, continuous bandwidth [4][5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

54 Tb/s transmission over 9,150 km with optimized hybrid Raman-EDFA amplification and coded modulation

Cai

Sun

Batshon

et al. 2014

2014 the European Conference on Optical Communication (ECOC)

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38.75 Tb/s transmission experiment over transoceanic distance

Cited by 32 publications

References 1 publication

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

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

Performance Study of 100-Gb/s Super-Nyquist QPSK and Nyquist 8QAM over 25-GHz Spacing

54 Tb/s transmission over 9,150 km with optimized hybrid Raman-EDFA amplification and coded modulation

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