Experimental investigation on nonlinear tolerance of subcarrier multiplexed signals with spectrum optimization

Nakashima, Hideharu; Tanimura, Takahito; Oyama, Tomofumi; Akiyama, Yoshinori; Hoshida, Takeshi; Rasmussen, Jens C.

doi:10.1109/ecoc.2015.7341638

Cited by 7 publications

(6 citation statements)

References 7 publications

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“…However, the gain could also be attributed to other beneficial effects of using subcarriers in that particular set-up. Other WDM experiments [9]- [11] found conflicting results, between about 8% MR gain and no gain at all. Overall, at present, experimental evidence appears to be inconclusive as to the extent of possible SRO gains.…”

mentioning

confidence: 93%

Analytical and Experimental Results on System Maximum Reach Increase Through Symbol Rate Optimization

Poggiolini

Nespola

Jiang

et al. 2016

J. Lightwave Technol.

122

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We investigated the reach increase obtained through non-linearity mitigation by means of transmission symbol rate optimization (SRO). First, we did this theoretically and simulatively. We showed that the non-linearity model that properly accounts for the phenomenon is the EGN model, in its version that specifically includes four-wave mixing. We then found that for PM-QPSK systems at full-C-band the reach increase may be substantial, on the order of 10%-25%, with optimum symbol rates on the order of 2-to-6 GBaud. We extended the investigation to PM-16QAM, where we found a qualitatively similar effect, although the potential reach increase is typically only about 50% to 60% of that of PM-QPSK. We show that, for C-band PM-QPSK systems over SMF, the potential mitigation due to SRO is greater than that ideally granted by digital back-propagation (the latter applied over a bandwidth of a 32-GBaud channel).We then set up an experiment to obtain confirmation of the theoretical and simulative predictions. It consisted of 19 PM-QPSK channels, operating at 128 Gbit/s per channel, over PSCF, with span length 108 km and EDFA-only amplification. We demonstrated a reach increase of about 13.5%, when going from single-carrier per channel transmission, at 32 GBaud, to 8subcarrier per channel, at 4 GBaud, in line with the EGN model predictions.

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mentioning

confidence: 93%

Analytical and Experimental Results on System Maximum Reach Increase Through Symbol Rate Optimization

Poggiolini

Nespola

Jiang

et al. 2016

J. Lightwave Technol.

122

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“…A 19 × 128 Gb/s PM-QPSK experiment has been reported in [5], where 12% extended reach was found with an 8-subcarrier channel configuration. In [4], enhanced SRO benefits were found by increasing the inter-subcarrier spacing in a 8channel PM-QPSK experiment, yielding 0.7 dB gain in required OSNR after propagation, even suffering from a 0.3 dB back-to-back (B2B) MSC implementation penalty. Indeed, increased MSC B2B penalties relatively to SC transmission have been reported in several recent works.…”

Section: Introductionmentioning

confidence: 99%

“…It exploits the flexibility on signal design provided by fast digital-to-analog converters (DACs), enabling to create multiple electrically-generated subcarrier signals composed of an adjustable number of low symbol-rate tributaries. The main competitive advantage of MSC over standard SC transmission lies on the additional nonlinear robustness provided by the recently identified symbol-rate optimization (SRO) phenomenon [1][2][3][4][5][6][7][8]. Exploring the additional degree of freedom (number of subcarriers) provided by MSC transmission, several analytical, simulation and experimental works have identified that the total nonlinear interference (NLI) impinging on a given channel under test (CUT) turns out to depend on the per-subcarrier symbol-rate [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear mitigation on subcarrier-multiplexed PM-16QAM optical systems

Guiomar¹,

Carena²,

Bosco³

et al. 2017

Opt. Express

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We report a comprehensive set of experimental, simulation and analytical results on the benefit of nonlinear mitigation strategies for multi-subcarrier (MSC) PM-16QAM transmission systems. First, we demonstrate ∼9% maximum reach gain enabled by symbol-rate optimization (SRO) of MSC-PM-16QAM in a 31 channels WDM transmission experiment. Then, we demonstrate that, in the considered experimental scenario, the gain provided by digital backpropagation (DBP) over single-carrier (SC) transmission is similar to that achieved by SRO over MSC transmission. Furthermore, we show that the SRO phenomenon can be weakened after self-channel interference (SCI) removal through DBP. As a result, and due to DBP performance limitations in the experiment, the combined effect of SRO and DBP was found to enable only an additional 4% gain in maximum reach. Finally, we address the impact and symbol-rate dependence of nonlinear phase noise (NLPN) in MSC-PM-16QAM transmission, discussing on the NLPN mitigation capability of standard carrier phase estimation (CPE) and on respective gains that could be achieved through its enhanced mitigation.

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“…However, the gain could also be attributed to other beneficial effects of using subcarriers in that particular set-up. Other WDM experiments [39][40][41] found conflicting results, between about 8% MR gain and no gain at all. One ultra-long-haul experiment 36 based on PM-QPSK recently found a 12.5% reach increase over PSCF, from 12,610 km at 32 Gbaud, to 14,180 km at 4 Gbaud.…”

Section: Impact Of Symbol Rate On System Reachmentioning

confidence: 95%

“…Besides theory and simulation, also various experimental papers have lately addressed SRO. [36][37][38][39][40][41][42][43] The results have not been unanimous. Note in passing that, given the low value of the optimum rates, these experiments were conducted by breaking up each single optical channel into electrical subcarriers, generated digitally through the transmitter DSP and DACs (see Section 5 for a more detailed description of subcarrier multiplexing).…”

Section: Impact Of Symbol Rate On System Reachmentioning

confidence: 99%

Scalable modulation technology and the tradeoff of reach, spectral efficiency, and complexity

et al. 2017

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Bandwidth and capacity demand in metro, regional, and long-haul networks is increasing at several tens of percent per year, driven by video streaming, cloud computing, social media and mobile applications. To sustain this traffic growth, an upgrade of the widely deployed 100-Gbit/s long-haul optical systems, based on polarizationmultiplexed quadrature phase-shift keying (PM-QPSK) modulation format associated with coherent detection and digital signal processing (DSP), is mandatory. In fact, optical transport techniques enabling a per-channel bit rate beyond 100 Gbit/s have recently been the object of intensive R&D activities, aimed at both improving the spectral efficiency and lowering the cost per bit in fiber transmission systems. In this invited contribution, we review the different available options to scale the per-channel bit-rate to 400 Gbit/s and beyond, i.e. symbol-rate increase, use of higher-order quadrature amplitude modulation (QAM) modulation formats and use of super-channels with DSP-enabled spectral shaping and advanced multiplexing technologies. In this analysis, trade-offs of system reach, spectral efficiency and transceiver complexity are addressed. Besides scalability, next generation optical networks will require a high degree of flexibility in the transponders, which should be able to dynamically adapt the transmission rate and bandwidth occupancy to the light path characteristics. In order to increase the flexibility of these transponders (often referred to as "flexponders"), several advanced modulation techniques have recently been proposed, among which sub-carrier multiplexing, hybrid formats (over time, frequency and polarization), and constellation shaping. We review these techniques, highlighting their limits and potential in terms of performance, complexity and flexibility.

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Experimental investigation on nonlinear tolerance of subcarrier multiplexed signals with spectrum optimization

Cited by 7 publications

References 7 publications

Analytical and Experimental Results on System Maximum Reach Increase Through Symbol Rate Optimization

Analytical and Experimental Results on System Maximum Reach Increase Through Symbol Rate Optimization

Nonlinear mitigation on subcarrier-multiplexed PM-16QAM optical systems

Scalable modulation technology and the tradeoff of reach, spectral efficiency, and complexity

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