20 Tbit/s Transmission Over 6860 km With Sub-Nyquist Channel Spacing

Cai, J.-X.; Davidson, Carl; Lucero, A.; Zhang, Hongbin; Foursa, D. G.; Sinkin, O. V.; Patterson, W.W.; Pilipetskii, A.N.; Mohs, G.; Bergano, Neal S.

doi:10.1109/jlt.2011.2179975

Cited by 78 publications

(21 citation statements)

References 13 publications

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“…This technique can be a valid alternative to conventional orthogonal signaling to attain spectrally efficient transmissions over optical fibers, as also recently demonstrated in 4 provided that interference is effectively dealt with at the receive processing unit. In this work, we transmit seven 28 GHz spaced 160 Gb/s DP-QPSK optical carriers frequency-packed, over a 200 GHz bandwidth, having optimized the individual filter bandwidth and the carrier spacing to maximize the achievable spectral efficiency for a predetermined postdetection receiver complexity.…”

Section: Introductionmentioning

confidence: 81%

Casting 1 Tb/s DP-QPSK Communication into 200 GHz Bandwidth

Potì

Meloni

Berrettini

et al. 2012

European Conference and Exhibition on Optical Communication

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Section: Introductionmentioning

confidence: 81%

Casting 1 Tb/s DP-QPSK Communication into 200 GHz Bandwidth

Potì

Meloni

Berrettini

et al. 2012

European Conference and Exhibition on Optical Communication

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“…Although no detailed analysis on the mechanisms that allow MLSD mitigate linear crosstalk penalties was targeted in this work, we can conjecture based on [23,24]. Qualitatively, we can indicate that, given the DSP configuration set in receiver, the training rule to adapt the equalizer taps may indirectly choose a narrow bandwidth filter structures that suppress crosstalk from neighbor carriers.…”

Section: On the Mlsd Crosstalk Mitigation Performancementioning

confidence: 95%

Impairment mitigation in superchannels with digital backpropagation and MLSD

Silva¹,

Larsen²,

Zibar³

2015

Opt. Express

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We assess numerically the performance of single-carrier digital backpropagation (SC-DBP) and maximum-likelihood sequence detection (MLSD) for DP-QPSK and DP-16QAM superchannel transmission over dispersion uncompensated links for three different cases of spectral shaping: optical pre-filtering of RZ and NRZ spectra, and digital Nyquist filtering. We investigate the limits for carrier proximity of each spectral shaping technique and the correspondent performance behavior of each algorithm, for both modulation formats. For superchannels with carrier spacing close to the Nyquist limit, it is shown that the maximum performance improvement of 1.0 dB in Q 2 -factor is provided by those algorithms. However, such gain can be highly reduced when the order of the modulation format increases.

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“…The challenge is that the number of states and transitions grows exponentially with the involved memory length. For instance, the adopted MLSE length of 10 means states and transitions in lane-dependent PDM-QPSK signals [20], and therefore the computational complexity significantly increases in practical implementation. On the other hand, in the bandwidth-limiting optical coherent system, the noise in high frequency components of the signal spectrum is enhanced after conventional linear impairment equalization algorithm, such as conventional constant modulus algorithm (CMA) [21].…”

Section: A the Principle Of Digital Post Filteringmentioning

confidence: 99%

Transmission of 200 G PDM-CSRZ-QPSK and PDM-16 QAM With a SE of 4 b/s/Hz

Dong

Chien

et al. 2013

J. Lightwave Technol.

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We have realized the first field transmission of 8 216.8-Gb/s Nyquist wavelength-division-multiplexing (N-WDM) signals over 1750-km G.652 fiber consisting of 950-km real and 800-km lab fibers with erbium-doped fiber amplifier (EDFA)-only amplification. The average loss per span is 21.6 dB. Each channel is modulated with 54.2-Gbaud (216.8-Gb/s) polarization-division-multiplexing carrier-suppressed return-to-zero quadrature-phase-shift-keying (PDM-CSRZ-QPSK) data on a 50-GHz grid giving a record spectral efficiency (SE) of 4 b/s/Hz. Digital post filtering and 1-bit maximum likelihood sequence estimation (MLSE) are introduced into the offline digital signal processing (DSP) at the receiver to suppress noise, linear crosstalk and filtering effects. We have also investigated the co-transmission of 200 G PDM-CSRZ-QPSK and 200 G PDM 16-ary quadrature-amplitude-modulation (PDM-16 QAM) signals on a 50-GHz grid, and found that PDM-CSRZ-QPSK signals have better bit-error-rate (BER) performance for both back-to-back and 700-km transmission cases. Meanwhile, PDM-16 QAM signals are subject to larger crosstalk from the neighboring Nyquist QPSK channels.

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20 Tbit/s Transmission Over 6860 km With Sub-Nyquist Channel Spacing

Cited by 78 publications

References 13 publications

Casting 1 Tb/s DP-QPSK Communication into 200 GHz Bandwidth

Casting 1 Tb/s DP-QPSK Communication into 200 GHz Bandwidth

Impairment mitigation in superchannels with digital backpropagation and MLSD

Transmission of 200 G PDM-CSRZ-QPSK and PDM-16 QAM With a SE of 4 b/s/Hz

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