40/100/400 Gb/s Mixed Line Rate Transmission Performance in Flexgrid Optical Networks

Zong, Liangjia; Liu, G. N.; Lord, Andrew; Zhou, Yu Rong; Ma, Teng

doi:10.1364/ofc.2013.otu2a.2

Cited by 19 publications

(13 citation statements)

References 2 publications

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“…2 and Fig. 3, even in case the super-channel is required to operate at power lower than its NLT, due to power allocation strategies [17,24,25], still ≥~2dB performance margins are visible for any given configuration. …”

Section: Performance Marginsmentioning

confidence: 95%

“…Figure 1(a) shows the transmission setup, and consisted of PM-mQAM (m = 8, 16) central channel, at a fixed baud-rate of 30Gbaud, where different super-channel structures were modeled using 1-carrier PM-8QAM (180Gb/s), 1-carrier PM-16QAM (240Gb/s), 2-carriers PM-8QAM (360Gb/s), 2-carriers PM-16QAM (480Gb/s), and 5-carriers PM-16QAM (1.2Tb/s). In order to minimize the impact of linear sub-carrier crosstalk, and dense spectral grid, spectral shaping was applied in digital domain, where the roll-off coefficient was fixed at 0.2 [17]. Moreover, the spacing within the subcarriers was also optimized, and fixed at ~1.15xBaud-rate.…”

Section: Introductionmentioning

confidence: 99%

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Intra super-channel fiber nonlinearity compensation in flex-grid optical networks

Rafique¹,

Rahman²,

Napoli³

et al. 2013

Opt. Express

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Abstract:We report on the nonlinear transmission limits of various superchannel configurations in a flex-grid network upgrade scenario. In particular, we consider flexible data-rates ranging from 180Gb/s to 1.2Tb/s, employing either single-carrier, dual-carrier, or penta-carrier polarization multiplexed m-state quadrature amplitude modulation (PM-8QAM/PM-16QAM) -termed as super-channels, and establish transmission performance margins for each configuration, both with and without superchannel fiber nonlinearity compensation. Our results show that the benefit of intra super-channel nonlinearity mitigation (nonlinear compensation addressing full super-channel bandwidth) reduces with increasing subcarrier count within the super-channel, and that single-carrier super-channel achieves the maximum improvement from nonlinearity mitigation (up to ~4.5dB, in Q-factor), better than dual-carrier (up to ~3.5dB) and pentacarrier (up to ~2dB) configurations. Moreover, the maximum reach improvement, compared to linear compensation only, is found to be ~170%

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Section: Performance Marginsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Intra super-channel fiber nonlinearity compensation in flex-grid optical networks

Rafique¹,

Rahman²,

Napoli³

et al. 2013

Opt. Express

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show abstract

“…However, one of the key unknowns in such flex-networks is the interplay of nonlinear fiber impairments when different mix of modulation formats, data-rate, and spectral grid are propagated together. Recently, a preliminary study was reported in [10], investigating the nonlinear impact of 40Gb/s and 100Gb/s channels on a 400Gb/s PM-16QAM super-channel, however a detailed analysis across various super-channel configurations, traffic allocations, and link configurations is still missing. Another important issue is the fragmentation scenario in flexnetworks, due to spectrum allocation based on mixed traffic types, creating band-gaps across the spectrum, essentially reducing the capacity advantage [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we extend the analysis of [10], and investigate the impact of fiber nonlinearities on various super-channel configurations, in the presence of different neighboring modulation formats at various data-rates, and consequently propose spectrum allocation strategies for such super-channels. We consider various high bit-rate channels employing PM-16QAM format, operating at 240Gb/s, 480Gb/s and 1.2Tb/s, with respective spectral widths of 37.5GHz, 75GHz, and 187.5GHz, respectively.…”

Section: Introductionmentioning

confidence: 99%

Flex-grid optical networks: spectrum allocation and nonlinear dynamics of super-channels

et al. 2013

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“…State-of-the-art commercial systems employ spectrally efficient 100 Gb/s polarization multiplexed quadrature phase shift keying (PM-QPSK) transponders with powerful receiver-side DSP algorithms, fully capable to mitigate linear channel response and phase noise effects [1], [2]. The next-generation commercial products are not only focusing on advanced modulation formats (e.g., polarization multiplexed mstate quadrature amplitude modulation, PM-mQAM), but also on the flexibility of transmission architecture, employing concepts such as flex-grid super-channels [3]- [7]. In particular, data rates of 400 Gb/s [7], [8], 1 Tb/s [9], and 1.6 Tb/s [10], [11] are currently being envisioned for high speed data transport, with variable implementation architectures.…”

mentioning

confidence: 99%

Digital Preemphasis in Optical Communication Systems: On the DAC Requirements for Terabit Transmission Applications

Rafique

Napoli

Calabrò

et al. 2014

J. Lightwave Technol.

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Next-generation coherent optical systems are geared to employ high-speed digital-to-analog converters (DAC), allowing for digital preprocessing of the signal and flexible optical transport networks. However, one of the major obstacles in such architectures is the limited resolution (less than 5.5 effective bits) and -3 dB bandwidth of commercial DACs, typically limited to half of the currently commercial baud rates, and even relatively reduced in case of higher baud rate transponders (400 Gb/s and 1 Tb/s). In this paper, we propose a simple digital preemphasis (DPE) algorithm to compensate for DAC-induced signal distortions, and exhaustively investigate the impact of DAC specifications on system performance, both with and without DPE. As an outcome, performance improvements are established across various DAC hardware requirements (effective number of bits and bandwidth) and channel baud rates, for m-state quadrature amplitude modulation (QAM) formats. In particular, we show that lower order modulation formats are least affected by DAC limitations, however, they benefit the most from DPE in extremely challenging hardware conditions. On the contrary, higher order formats are severely limited by DAC distortions, and moderately benefit from DPE across a wide range of DAC specifications. Moreover, effective number of bit requirements are established for m-state QAM, assuming low and high baud rate transmission regimes. Finally, we discuss the application scenarios for the proposed DPE in next-generation terabit transmission systems, and establish maximum transportable baud rates, which are shown to be used toward increasing channel baud rates to reduce terabit subcarrier count or toward increasing forward error correction (FEC) overheads to reduce the pre-FEC bit error rate threshold. Maximum baud rates after DPE are summarized here for polarization multiplexed BPSK, QPSK, 8QAM, and 16QAM, assuming two DACs: Current commercial DACs (5.5 effective bits, 16 GHz bandwidth) 57, 54, 51, and 48 Gbaud, respectively. Next-generation DACs (7 effective bits, 22 GHz bandwidth): 62, 61, 60, and 58 Gbaud, respectively.

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40/100/400 Gb/s Mixed Line Rate Transmission Performance in Flexgrid Optical Networks

Cited by 19 publications

References 2 publications

Intra super-channel fiber nonlinearity compensation in flex-grid optical networks

Intra super-channel fiber nonlinearity compensation in flex-grid optical networks

Flex-grid optical networks: spectrum allocation and nonlinear dynamics of super-channels

Digital Preemphasis in Optical Communication Systems: On the DAC Requirements for Terabit Transmission Applications

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