9.6Tb/s CP-QPSK Transmission Over 6500 km of NZ-DSF With Commercial Hybrid Amplifiers

Rafique, Danish; Rahman, Talha; Napoli, Antonio; Palmer, R.; Slovak, J.; Man, E. De; Fedderwitz, Sascha; Kuschnerov, Maxim; Feiste, U.; Spinnler, Bernhard; Sommerkorn-Krombholz, Bernd; Bohn, Marc

doi:10.1109/lpt.2015.2445711

Cited by 11 publications

(48 citation statements)

References 24 publications

(22 reference statements)

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“…It has enabled a tenfold capacity increase by supporting the transmission of 100 Gb/s signals in the same 50 GHz spectrum slots previously used by 10 Gb/s intensity-modulated with direct-detection signals, while still allowing reaches of the order of thousands of kilometers without resorting to expensive 3R regeneration [1,2]. Moreover, the advanced digital signal processing supported by coherent-detection [3] enables developing line interfaces that can operate with different constellation sizes while keeping a constant baud rate [4].…”

Section: Introductionmentioning

confidence: 99%

Designing Transparent Flexible-Grid Optical Networks for Maximum Spectral Efficiency [Invited]

Pedro¹

2017

J. Opt. Commun. Netw.

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Higher-order modulation formats and spectral super-channels are key to maximizing spectral efficiency (SE) in next-generation optical transport networks, thereby postponing/minimizing expensive additional fiber rollouts and reconfigurable optical add/drop multiplexer node upgrades. A flexible dense wavelength division multiplexed (DWDM) grid is key to efficiently accommodating media channels requiring more (or less) than 50 GHz of contiguous spectrum. In particular, routing media channels consisting of multiple adjacent carriers enables packing them closer together and sharing a single pair of guard bands of adaptive width to cope with optical filtering. This effect is maximized by giving preference to deploying media channels with more carriers. However, designing the DWDM network in such a way can translate into resource overprovisioning whenever the traffic requirements between two nodes are below the (large) capacity of the most spectrally efficient media channel format that can be deployed between those nodes. This paper provides insight on how the set of media channels and the network design framework used impact the trade-off between maximizing SE and minimizing resource overprovisioning in transparent flexible-grid optical networks. Furthermore, it discusses enabling strategies to mitigate the risk of resource overprovisioning when maximizing network SE is the key design objective.

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Section: Introductionmentioning

confidence: 99%

Designing Transparent Flexible-Grid Optical Networks for Maximum Spectral Efficiency [Invited]

Pedro¹

2017

J. Opt. Commun. Netw.

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“…In other projects, unconventional large effective area fiber (LEAF) is used in which the nonlinear penalty is reduced including SRS, thus high power of Raman pump is required to increase amplification [9][10][11]. Other unconventional fibers are also used like DSF and NZ-DSF [12][13] that we are not interested in hereby. In later project [14], conventional SMF is used but the authors apply bidirectional Raman pumping scheme.…”

Section: Introductionmentioning

confidence: 99%

Unrepeatered OTDM Data Transmission over Long Legacy Fiber Span Using Unidirectional Backward Raman Amplification

Nahas¹

2015

JEEE

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This paper presents experimental results for transmitting 40 Gb/s OTDM signal over in-line long fiber span using unidirectional backward Raman amplification. The investigation uses legacy dispersion-managed SMF-DCF configuration where remote Erbium amplification is used to compensate for the DCF spans losses. It is practically shown that the system performance improves significantly with more Raman pump power if we use an appropriate signal wavelength, Raman pump power and Erbium gain. As a result, successful unrepeatered transmission over 206 km SMF is achieved using 1545 nm signal wavelength, 1.58 W Raman power and unsaturated EDFA gains into the DCF spans. We believe that the results of such investigation can be useful for enhancing systems that still use legacy cables without the need for substantial alteration.

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“…Achievable transmission reach of high capacity QAM formats is however limited due to reduced nonlinear tolerance and higher required optical signal to noise ratio (OSNR) to achieve error free post-forward error correction (FEC) performance [8], [9]. In order to improve the received OSNR, and consequently extend transmission reach, hybrid amplification schemes employing both erbium doped fiber amplifier (EDFA) and Raman amplifier have gained significant interest [10], [11]. Distributed Raman amplification is specially suitable for longer spans and larger span attenuation, characteristics enabling long-haul transmission of high-order QAM formats [12], [13].…”

mentioning

confidence: 99%

Long-Haul Transmission of PM-16QAM-, PM-32QAM-, and PM-64QAM-Based Terabit Superchannels Over a Field Deployed Legacy Fiber

Rahman

Rafique

Spinnler

et al. 2016

J. Lightwave Technol.

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Increase in transmission symbol-rate as well as order of quadrature amplitude modulation (QAM) is identified as the most economical way to reduce cost per transmitted bit. In particular, next generation transponders aim at supporting datarates up to 1 Tb/s employing superchannels due to electrical components' bandwidth limitations. Furthermore, the introduction of a flexible-grid architecture can maximize throughput by minimizing spectral gaps in available optical spectrum. Keeping in view these design options, we conducted several high capacity experiments with tier1 operator Orange using their field deployed standard single mode fiber (SSMF, G.652), having a total length of 762 km, connecting the cities Lyon and Marseille in France. In particular we employed four subcarriers per Tb/s superchannel, each modulated by PM-16QAM, PM-32QAM and PM-64QAM with per carrier symbol-rates of 41.2 GBd, 33 GBd and 34 GBd, respectively. The subcarrier spacing was 50 GHz for the PM-16QAM case and 37.5 GHz for both the PM-32QAM and PM-64QAM cases allowing in total 24×1.0 Tb/s, 32×1.0 Tb/s and 32×1.2 Tb/s superchannels over C-band and resulting in potential C-band capacities of 24.0 Tb/s, 32.0 Tb/s and 38.4 Tb/s, respectively. After field transmission the maximum available OSNR0.1nm margin compared to the required OSNR0.1nm at forward error correction (FEC) threshold was 8.2 dB, 5.4 dB and 4.2 dB for PM-16QAM, PM-32QAM and PM-64QAM, respectively. The transmission reach for PM-16QAM and PM-32QAM modulated superchannels was extended to ∼1571 km and ∼1065 km using erbium doped fiber amplified SSMF spans of ∼101 km length.

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9.6Tb/s CP-QPSK Transmission Over 6500 km of NZ-DSF With Commercial Hybrid Amplifiers

Cited by 11 publications

References 24 publications

Designing Transparent Flexible-Grid Optical Networks for Maximum Spectral Efficiency [Invited]

Designing Transparent Flexible-Grid Optical Networks for Maximum Spectral Efficiency [Invited]

Unrepeatered OTDM Data Transmission over Long Legacy Fiber Span Using Unidirectional Backward Raman Amplification

Long-Haul Transmission of PM-16QAM-, PM-32QAM-, and PM-64QAM-Based Terabit Superchannels Over a Field Deployed Legacy Fiber

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