Experimental Comparison of 32-Gbaud Electrical-OFDM and Nyquist-WDM Transmission with 64GSa/s DAC

Lu, Yi-Chang; Fang, Yuanyuan; Wu, Bo; Wang, K.; Wan, Wenhui; Yu, Fan; Li, L.; Shi, Xiaozhong; Xiong, Qianjin

doi:10.1049/cp.2013.1393

Cited by 10 publications

(4 citation statements)

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“…This improvement is comparable with what can be realized with the DBP approach using 4 steps per span. In our simulations, we observed that the OFDM and Nyquist-shaped systems have similar performance, which agrees well with some current numerical and experimental comparisons of the OFDM and Nyquist-shaped systems [55,56]. However, when combining it with the NIS method, OFDM displays a much better performance.…”

Section: Performance Comparison Of Nis Versus Dbp In the Presence Of ...supporting

confidence: 88%

Nonlinear inverse synthesis for high spectral efficiency transmission in optical fibers

Le¹,

Prilepsky²,

Turitsyn³

2014

Opt. Express

136

158

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In linear communication channels, spectral components (modes) defined by the Fourier transform of the signal propagate without interactions with each other. In certain nonlinear channels, such as the one modelled by the classical nonlinear Schrödinger equation, there are nonlinear modes (nonlinear signal spectrum) that also propagate without interacting with each other and without corresponding nonlinear cross talk, effectively, in a linear manner. Here, we describe in a constructive way how to introduce such nonlinear modes for a given input signal. We investigate the performance of the nonlinear inverse synthesis (NIS) method, in which the information is encoded directly onto the continuous part of the nonlinear signal spectrum. This transmission technique, combined with the appropriate distributed Raman amplification, can provide an effective eigenvalue division multiplexing with high spectral efficiency, thanks to highly suppressed channel cross talk. The proposed NIS approach can be integrated with any modulation formats. Here, we demonstrate numerically the feasibility of merging the NIS technique in a burst mode with high spectral efficiency methods, such as orthogonal frequency division multiplexing and Nyquist pulse shaping with advanced modulation formats (e.g., QPSK, 16QAM, and 64QAM), showing a performance improvement up to 4.5 dB, which is comparable to results achievable with multi-step per span digital back propagation.

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Section: Performance Comparison Of Nis Versus Dbp In the Presence Of ...supporting

confidence: 88%

Nonlinear inverse synthesis for high spectral efficiency transmission in optical fibers

Le¹,

Prilepsky²,

Turitsyn³

2014

Opt. Express

136

158

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“…7, compared with that of the system with only EDFAs, the optimum Q 2 -factors of the system with the hybrid EDFA/Raman amplifiers and all backward-pumped Raman amplifiers are about 1.8 and 2.5-dB higher, respectively, at 2431 km for both 37.5-and 50-GHz channel spacings. Note that compared with SSMF spans with similar span loss, the optimum launch power of our system is about 2 dB higher due to the use of large effective area fiber [18].…”

Section: B Wdm Transmission Performancementioning

confidence: 99%

Transmission Performance of 256-Gb/s PDM-16QAM With Different Amplification Schemes and Channel Spacings

Xie¹,

Zhu²,

Burrows³

2014

J. Lightwave Technol.

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We experimentally investigate the performance of a 256-Gb/s polarization-division-multiplexed 16-ary quadratureamplitude-modulation (PDM-16QAM) transmission system in dispersion uncompensated TeraWave SLA+ fiber spans using erbium-doped-fiber amplifiers (EDFAs), hybrid EDFA/Raman amplifiers, and all backward-pumped Raman amplifiers. The effects of 37.5-and 50-GHz channel spacings and cascaded optical add/drop multiplexers (ROADMs) on the system performance are studied. We find that when there are no ROADMs, hybrid EDFA/Raman amplifiers and all-backward-pumped Raman amplifiers can increase the reach by about 70% and 100%, respectively, compared to EDFA-only amplifiers, from 2000 to about 3500 and 4200 km, respectively, assuming 20% soft-decision forwarderror-correction (SD-FEC) for the system with both 37.5-and 50-GHz channel spacings. We show that cascaded ROADMs have a small impact on the system with 50-GHz channel spacing, but can severely degrade the performance of the system with 37.5-GHz channel spacing and virtually eliminate the reach gain from Raman amplifiers in such systems due to large penalties and higher error floors induced by ROADM filtering effects. We also show that for the same number of channels, the system with 37.5and 50-GHz channel spacings has similar performance when there are no ROADMs. Index Terms-Coherent detection, fiber nonlinearities, nonlinear transmission, optic fiber communication, Raman amplifiers, reconfigurable optical add/drop multiplexers (ROADMs). 0733-8724

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“…Next commercial 400 Gb/s systems are envisioned as a Nyquist 2 x 200 Gb/s DP-16QAM carriers for transmissions below 400 km, and a Nyquist 4 x 100 Gb/s DP-QPSK carriers for long haul optical links, offering higher degree of parallelism and higher spectral efficiency when compared to DP-QPSK 100 Gb/s systems [8]. On the other hand, carrier capacity of 32 Gbaud seems to be the right trade-off to increase the spectral efficiency without stressing too much electronics and transmission performance for the next multi-carrier transport systems beyond 100 Gb/s [9,10].…”

Section: Introductionmentioning

confidence: 99%

Characterization of interchannel interference effects in multicarrier 32-Gbaud QPSK/16QAM Nyquist systems

Torres

Soto

González³

2015

IEEE Colombian Conference on Communication and Computing (IEEE COLCOM 2015)

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Multi-carrier optical transmission with ideal spectrum occupancy per-carrier equal to data baud rate (Nyquist criteria) with overall spectral efficiency higher than 2 bit/s/Hz is expected to replace currently deployed single-carrier 100 Gb/s DP-QPSK systems. However, ideal Nyquist shaping per carrier is not easily achievable due to the bandwidth resolution in optical filtering and the high computational complexity in digital filtering. This paper investigates and characterizes in terms of bit-error-rate (BER) performance degradation, the impact of spectral overlapping between adjacent optical carriers known as inter-channel interference (ICI), under variations of the following system parameters: roll-off factor of the digital Nyquist filter, channel spacing, linewidth laser and transmission distance. ICI is numerically studied in a 3x32-Gbaud 384-Gb/s scenario with QPSK and 16-QAM modulation formats. Results show a high impact in the non-ideal spectral channel generation due to the roll-off factor. Channel spacing of an ideal 32 GHz spectrum separation has a high impact in BER, 4 decades of BER difference compared with a 34 GHz separation. Besides, a dependency between ICI and transmitted sequences per channel has been identified. This bit sequences influence, can lead a new bit-probability-awareness codification technique to mitigate ICI effects in future optical scenarios.

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Experimental Comparison of 32-Gbaud Electrical-OFDM and Nyquist-WDM Transmission with 64GSa/s DAC

Cited by 10 publications

References 0 publications

Nonlinear inverse synthesis for high spectral efficiency transmission in optical fibers

Nonlinear inverse synthesis for high spectral efficiency transmission in optical fibers

Transmission Performance of 256-Gb/s PDM-16QAM With Different Amplification Schemes and Channel Spacings

Characterization of interchannel interference effects in multicarrier 32-Gbaud QPSK/16QAM Nyquist systems

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