Field trial results on statistics of fast polarization changes in long haul WDM transmission systems

Krummrich, Peter M.; Schmidt, E.-D.; Weiershausen, W.; Mattheus, A.

doi:10.1109/ofc.2005.193020

Cited by 65 publications

(26 citation statements)

References 4 publications

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“…Block-adaptation combined with fast transforms allows to reduce the computational cost. It is further justified here by the fact that the rate of PMD variation is several orders of magnitude smaller than the symbol rate [5].…”

Section: Introductionmentioning

confidence: 96%

Efficient Frequency-Domain Implementation of Block-LMS/CMA Fractionally Spaced Equalization for Coherent Optical Communications

Zia-Chahabi

Bidan

Morvan

et al. 2011

IEEE Photon. Technol. Lett.

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We introduce a computationally efficient frequency-domain implementation of a fractionally spaced block-least-mean-square (LMS) or block-constant-modulus-algorithm (CMA) equalizer. The proposed implementation is less complex than its time-domain counterpart. Besides, it lends itself naturally to high-throughput parallel architectures thanks to block-processing based on fast Fourier transforms. The resulting equalizer may be used for adaptive polarization-mode dispersion (PMD) equalization, or for joint adaptive compensation of chromatic dispersion (CD) and PMD in digital coherent receivers.

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Section: Introductionmentioning

confidence: 96%

Efficient Frequency-Domain Implementation of Block-LMS/CMA Fractionally Spaced Equalization for Coherent Optical Communications

Zia-Chahabi

Bidan

Morvan

et al. 2011

IEEE Photon. Technol. Lett.

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“…In sheltered environments, as ducts or lab facilities, polarization fluctuations are typically characterized by a timescale on the order of minutes or days [28][29][30]. Faster sub-milisecond polarization fluctuations are usually reported as isolated events caused by specific mechanical or atmospheric perturbations [30][31][32][33]. These perturbations were not observed during our lab experiments and the fluctuations of the room temperature did not exceed one degree Celsius.…”

Section: Time Evolution Of the Photodetected Icxt Powermentioning

confidence: 89%

Intercore crosstalk in direct-detection homogeneous multicore fiber systems impaired by laser phase noise

et al. 2017

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Abstract:The impact of the laser phase noise on the photodetected intercore crosstalk and performance of direct-detection orthogonal frequency division multiplexing multicore fiber systems is experimentally investigated. A new solution to overcome the performance fluctuations over time induced by the combined effect of laser phaser noise and intercore crosstalk is proposed. The solution uses adaptive modulation with extended time memory to estimate the bit loading scheme of each subcarrier from the mean and maximum error vector magnitude evaluated over the last ten blocks of transmitted training symbols. During measurements of up to 90 hours, intercore crosstalk power variation induced by fast laser phase noise variations exceeded 20 dB in both time and frequency, and error vector magnitude fluctuations of 4 dB were observed on a sub-second timescale. It is shown that direct-detection orthogonal frequency division multiplexing multicore fiber based systems employing a typical adaptive modulation solution, in which the bit loading scheme is evaluated from a single set of training symbols, suffer from unacceptable outage probabilities and are unable to counteract the fast power variations of intercore crosstalk and phase noise induced impairments. By extending the system memory used to estimate the bit loading scheme employed by the adaptive technique, an outage probability reduction by one order of magnitude is achieved. This reduction is attained by using the mean of the error vector magnitude evaluated over the last ten blocks of training symbols to estimate the bit loading scheme of subcarriers. Further reduction of the outage probability by four orders of magnitude is also demonstrated using a more conservative approach to estimate the bit loading scheme of the subcarriers. However, this conservative approach, based on the maximum error vector magnitude, may lead to additional loss of the average throughput.

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“…We then assume our optical network to support a maximum of N max = 200 WDM channels per fiber, 1 and assign N max wavelengths to the fiber that carries the highest capacity C f ,max . All other fibers are assigned N k ≤ N max wavelengths to carry C f ,k ≤ C f ,max .…”

Section: E Deployment Of Wdm Systemsmentioning

confidence: 99%

“…• fill 10 Gb/s channels first, or 1 Smaller values of N max lead to a larger WDM channel granularity. We discussed the dependence on N max in [26].…”

Section: F Putting Traffic Onto the Wdm Infrastructurementioning

confidence: 99%

Impairment-Aware Optical Networking Using Cross-Layer Communication

Fidler

Winzer

Thottan

et al. 2013

J. Opt. Commun. Netw.

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Abstract-We study strategies for relaxing physical layer constraints in flexible transparent optical transport networks through traffic engineering as well as through impairmentaware traffic management supported by cross-layer communication. We show that impairment-aware traffic management can effectively counteract inter-channel impairments on the physical layer and yield significant throughput gains. Using extensive Monte Carlo simulations, we find these throughput gains to be fairly independent of network topology and size. Based on analytical formulations for the performance gain resulting from impairment-aware networking we evaluate the dependence of the cost per bit on the applied traffic management method as well as on parameters such as the inter-channel impairment probability and the average network utilization.

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Field trial results on statistics of fast polarization changes in long haul WDM transmission systems

Abstract: Field trials were carried out to determine the statistics of fast polarization changes in optical networks. Important data enabling the definition of speed requirements for PMD compensators and adaptive equalizers could be obtained.

Cited by 65 publications

References 4 publications

Efficient Frequency-Domain Implementation of Block-LMS/CMA Fractionally Spaced Equalization for Coherent Optical Communications

Efficient Frequency-Domain Implementation of Block-LMS/CMA Fractionally Spaced Equalization for Coherent Optical Communications

Intercore crosstalk in direct-detection homogeneous multicore fiber systems impaired by laser phase noise

Impairment-Aware Optical Networking Using Cross-Layer Communication

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