Maximum-Likelihood-Based Blind Dispersion Estimation for Coherent Optical Communication

Wymeersch, Henk; Johannisson, Pontus

doi:10.1109/jlt.2012.2210194

Cited by 13 publications

(4 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The static equalizer is used to compensate chromatic dispersion and in this work it is assumed that the link length is known. However, multiple methods to estimate the amount of dispersion are available [27,28]. In this work we use the static equalizer prior to the frame synchronization.…”

Section: Static Equalizationmentioning

confidence: 99%

Overhead-optimization of pilot-based digital signal processing for flexible high spectral efficiency transmission

et al. 2019

View full text Add to dashboard Cite

We present a low-complexity fully pilot-based digital signal processing (DSP) chain designed for high spectral efficiency optical transmission systems. We study the performance of the individual pilot algorithms in simulations before demonstrating transmission of a 51×24 Gbaud PM-64QAM superchannel over distances reaching 1000 km. We present an overhead optimization technique using the system achievable information rate to find the optimal balance between increased performance and throughput reduction from adding additional DSP pilots. Using the optimal overhead of 2.4%, we report 9.3 (8.3) bits/s/Hz spectral efficiency, or equivalently 11.9 (10.6) Tb/s superchannel throughput, after 480 (960) km of transmission over 80 km spans with EDFA-only amplification. Moreover, we show that the optimum overhead depends only weakly on transmission distance, concluding that back-to-back optimization is sufficient for all studied distances. Our results show that pilot-based DSP combined with overhead optimization can increase the robustness and performance of systems using advanced modulation formats while still maintaining state-of-the-art spectral efficiency and multi-Tb/s throughput.

show abstract

Section: Static Equalizationmentioning

confidence: 99%

Overhead-optimization of pilot-based digital signal processing for flexible high spectral efficiency transmission

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In this paper, we assume that the CD is perfectly known at the receiver. In practice, it can be acquired beforehand by using one of the existing CD estimation methods, such as [16].…”

Section: Chromatic Dispersion Compensation With the Frequency Samentioning

confidence: 99%

Efficient Chromatic Dispersion Compensation and Carrier Phase Tracking for Optical Fiber FBMC/OQAM Systems

Nguyen

Rottenberg

Gorza

et al. 2017

J. Lightwave Technol.

View full text Add to dashboard Cite

Offset-QAM-based filterbank multicarrier (FBMC/OQAM) is an attractive candidate to improve the spectral containment of optical fiber communication systems, especially when considering a sufficiently high number of subcarriers. As for other multicarrier modulations, the chromatic dispersion (CD) compensation is simplified in FBMC/OQAM systems since it is performed in the frequency domain. Unfortunately, FBMC/OQAM systems are sensitive to the laser phase noise (PN). The PN becomes difficult to mitigate when the number of subcarriers increases due to the increased symbol period. It results in inter-carrier interference (ICI) and inter-symbol interference (ISI) due to the loss of OQAM orthogonality. In this paper, we consider the use of moderate numbers of subcarriers to allow for simpler PN tracking. Consequently, more advanced CD compensation methods are required and a trade-off between CD Abstract-Offset-QAM-basedfilterbank multicarrier (FBMC/OQAM) is an attractive candidate to improve the spectral containment of optical fiber communication systems, especially when considering a sufficiently high number of subcarriers. As for other multicarrier modulations, the chromatic dispersion (CD) compensation is simplified in FBMC/OQAM systems since it is performed in the frequency domain. Unfortunately, FBMC/OQAM systems are sensitive to the laser phase noise (PN). The PN becomes difficult to mitigate when the number of subcarriers increases due to the increased symbol period. It results in inter-carrier interference (ICI) and inter-symbol interference (ISI) due to the loss of OQAM orthogonality. In this paper, we consider the use of moderate numbers of subcarriers to allow for simpler PN tracking. Consequently, more advanced CD compensation methods are required and a trade-off between CD and PN compensations needs to be studied. In this paper, the frequency sampling equalizer is used for the CD compensation, whereas an innovative adaptive maximum likelihood estimator is used for the PN compensation. A methodology is then presented to analyze this performance trade-off between CD and PN compensations, and design the desirable system parameters such as the number of subcarriers and the equalizer length. This is illustrated in the case of a terrestrial long-haul FBMC/OQAM transmission system, with 400-kHz laser linewidth and a 1000 km optical link.

show abstract

“…Among all the progress in OPM, the accuracy of CD monitoring directly affects the accuracy of nonlinearity monitoring and it's essential to estimate CD first [6]. Thanks to the rapid development of digital signal processing and powerful algorithms, various CD monitoring methods have been proposed and demonstrated, encompassing those based on radio fre-quency pilot tone or clock tone [7], [8], maximum likelihood criterion [9], [10], separability of histogram [11], delay tap sampling (DTS) [12], auto-correlation of signal power waveform [13], nonlinear effects [14], [15] and machine learning (ML) [16], [17]. Although a majority of the recent OPM researches focus on ML [5], especially the neural network [18], [19], it is extremely easy to get severely overfitting results because the neural network may learn the characteristics of PRBS itself rather than the channels' characteristics [20]- [22].…”

Section: Introductionmentioning

confidence: 99%

Delay-Tap-Sampling-Based Chromatic Dispersion Estimation Method With Ultra-Low Sampling Rate for Optical Fiber Communication Systems

et al. 2020

View full text Add to dashboard Cite

A cost-effective chromatic dispersion (CD) estimation method is proposed, which is based on the delay-tap sampling (DTS) technique in combination with periodic training sequences (PTS). By performing equivalent sampling of PTS, DTS-based CD estimation at ultra-low sampling rate can be realized, significantly reducing the cost and high-speed requirements of analog to digital converters (ADCs). In contrast to the existing Nyquist DTS-based CD estimation method, we construct the CD lookup table in the CD over-compensated region, which can be suitable for a dynamic range of OSNR conditions. The CD lookup table built from the simulation can be used in the experimental system with similar configurations directly, indicating that the suggested method is reasonable and highly feasible. Besides, with only 1.25 GSa/s sampling rate of ADCs (about 1/30 of the Nyquist sampling rate which is 40.28 GSa/s), both 20.14 GBaud quadrature-phase-shift-keying (QPSK) simulation and experimental systems demonstrate the feasibility of the method, with a 28 ps/nm maximum CD estimation error for the simulation and a 35 ps/nm maximum CD estimation error for the experiment when OSNR is fixed to 18 dB. Furthermore, we also investigate the robustness of our method under the condition of different amplifier spontaneous emission (ASE) noise and nonlinear noise. The proposed method shows great potential for making a remarkable cost reduction in CD monitoring. INDEX TERMS Metrology, chromatic dispersion, fiber optics, fiber nonlinear optics.

show abstract

Maximum-Likelihood-Based Blind Dispersion Estimation for Coherent Optical Communication

Cited by 13 publications

References 16 publications

Overhead-optimization of pilot-based digital signal processing for flexible high spectral efficiency transmission

Overhead-optimization of pilot-based digital signal processing for flexible high spectral efficiency transmission

Efficient Chromatic Dispersion Compensation and Carrier Phase Tracking for Optical Fiber FBMC/OQAM Systems

Delay-Tap-Sampling-Based Chromatic Dispersion Estimation Method With Ultra-Low Sampling Rate for Optical Fiber Communication Systems

Contact Info

Product

Resources

About