2011
DOI: 10.1364/oe.19.009044
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Nonlinear penalties in long-haul optical
networks employing dynamic transponders

Abstract: Abstract:We report for the first time, the impact of cross phase modulation in WDM optical transport networks employing dynamic 28 Gbaud PMmQAM transponders (m = 4, 16, 64, 256). We demonstrate that if the order of QAM is adjusted to maximize the capacity of a given route, there may be a significant degradation in the transmission performance of existing traffic for a given dynamic network architecture. We further report that such degradations are correlated to the accumulated peak-to-average power ratio of th… Show more

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Cited by 15 publications
(20 citation statements)
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“…The one exception is the add-drop of 256QAM channels with a ROADM spacing of 160 km, which is close to the maximum possible reach of the format. Note that shorter through paths would tend to use higher-order formats for all the routes, where nonlinear sensitivity is higher [11], and therefore we expect similar conclusions.…”
Section: Resultssupporting
confidence: 52%
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“…The one exception is the add-drop of 256QAM channels with a ROADM spacing of 160 km, which is close to the maximum possible reach of the format. Note that shorter through paths would tend to use higher-order formats for all the routes, where nonlinear sensitivity is higher [11], and therefore we expect similar conclusions.…”
Section: Resultssupporting
confidence: 52%
“…We have previously shown that the optimum performance for PM-4QAM employing single-channel DBP in a dynamic mesh network with 80 km spans is achieved at -1 dBm [11]. We therefore initially consider a dynamic network with N ROADMs and m th order PM-QAM operating at -1 dBm, and the results are summarized in Table I.…”
Section: Resultsmentioning
confidence: 99%
“…All the numerical simulations were carried out using VPItransmissionMaker®v8.5, and the digital signal processing was performed in MATLAB®7.10. To establish a preliminary estimate of maximum potential transmission distance of each available format, we employed the transmission reaches identified in [16]. These are suitable to enable a BER of 3.8x10 −3 at a fixed launch power of −1 dBm assuming the availability of single-channel DBP.…”
Section: System Configurationmentioning
confidence: 99%
“…One such challenge is associated with the nonlinear transmission impairments [10][11][12][13]. In particular, it has been reported recently that the upgrade of a wavelength channel to a high spectral efficiency format is constrained by nonlinear cross-talk from the other network traffic [14][15][16], especially if the reach is such that intra-channel nonlinearities degrading the higher bit-rate traffic (e.g. 400 Gb/s) require mitigation by the use of digital back-propagation (DBP) [17][18][19].…”
Section: Introductionmentioning
confidence: 99%
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