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Advanced DSP for 400 Gb/s and Beyond Optical Networks

Xiang Zhou, Lynn Nelson
2014 Journal of Lightwave Technology  
by replacing the commonly used fast single-tap phaserotation-based equalizer (for typical carrier phase recovery) with a fast multi-tap linear equalizer.  ...  recovery algorithm that is designed to address the detrimental cyclic phase slipping problem with minimal training overhead.  ...  Novel, improved carrier-phase recovery and equalization algorithms and time-domain hybrid QAM were key enablers.  ... 
doi:10.1109/jlt.2014.2321135 fatcat:cb4fr2wjnrbd5navu3rnspxqoi

Real-Time Machine Learning Based Fiber-Induced Nonlinearity Compensation in Energy-Efficient Coherent Optical Networks [article]

Elias Giacoumidis, Yi Lin, Michaela Blott, Liam P. Barry
2019 arXiv   pre-print
We experimentally demonstrate the first field-programmable gate-array-based real-time fiber nonlinearity compensator (NLC) using sparse K-means++ machine learning clustering in an energy-efficient 40-Gb  ...  Our real-time NLC shows up to 3 dB improvement in Q-factor compared to linear equalization at 50 km of transmission.  ...  Afterwards, the signal went through a least-mean squares (LMS) digital filter for carrier phase recovery, and finally our proposed machine learning was processed in which hard and soft decision were included  ... 
arXiv:1910.04313v1 fatcat:lmfjf5lvprchxguet23ftsoxrq

Carrier frequency offset estimation based on circular harmonic expansion for optical coherent M-QAM communication systems

Trung-Hien Nguyen, Michel Joindot, Mathilde Gay, Laurent Bramerie, Jean-Claude Simon, Pascal Scalart, Olivier Sentieys
2015 2015 Opto-Electronics and Communications Conference (OECC)  
Circular harmonic expansion-based carrier frequency offset estimation is investigated for optical MQAM communication systems.  ...  The proposed method, combined with a gradient-descent algorithm, shows better performance compared to already proposed VVMFOE and 4 th power methods.  ...  It is also shown that the VVMPE estimator based on optimal nonlinear least-square (NLLS) is inferior to the CHE estimator, especially for cross MQAM constellations, due to the sign-changing nature of  ... 
doi:10.1109/oecc.2015.7340175 fatcat:4y6qk2uxpneofn7fqams7vnh4u

Optimized blind equalization for probabilistically shaped high-order QAM signals

Fengchu Cao, Mingyi Gao, Pengfei Wang, Xiaodi You, Gangxiang Shen
2022 Chinese Optics Letters (COL)  
In this work, we proposed an optimized blind equalization by utilizing a peak-density K-means clustering algorithm to accurately track the amplitude radius and distribution.  ...  However, standard digital signal processing algorithms are not optimal to demodulate PS high-order QAM signals.  ...  Acknowledgement This work was supported in part by the National Key R&D Program of China (No. 2020YFB1805805) and the National Natural Science Foundation of China (No. 62075147).  ... 
doi:10.3788/col202220.080601 fatcat:bwimmhjhmnathb3qvrzifl4swi

Anatomy of a Digital Coherent Receiver

2014 IEICE transactions on communications  
Subsequently, we describe the core part of the receiver -DSP algorithms -that are used for data processing.  ...  We cover all basic elements of a conventional coherent receiver DSP chain: deskew, orthonormaliation, chromatic dispersion compensation/nonlinear compensation, resampling and timing recovery, polarization  ...  Acknowledgments We would like to thank Antonio Caballero and Valeria Arlunno for their help in obtaining results presented in this work.  ... 
doi:10.1587/transcom.e97.b.1528 fatcat:36fuvvxlgzgi5buhr5bgn3rcue

Orthogonal frequency division multiplexing with amplitude shift keying subcarrier modulation as a reliable and efficient transmission scheme for self-mixing receivers

Jonas Kornprobst, Thomas J. Mittermaier, Thomas F. Eibert
2017 Advances in Radio Science  
<br><br> A nonlinear system of equations is constructed that describes a phase retrieval problem for the reconstruction of the original transmit signal before self-mixing.  ...  Our proposed technique eliminates the drawbacks of the self-heterodyne transmission scheme, which are the poor power efficiency and the strong dependence on the continously transmitted carrier.  ...  This work was supported by the German Research Foundation (DFG) and the Technische Universität München within the funding programme Open Access Publishing.  ... 
doi:10.5194/ars-15-99-2017 fatcat:fmhyrgjy6vgh3bp6dtedgm6hhy

Carrier Phase Estimation Through the Rotation Algorithm for 64-QAM Optical Systems

Syed Muhammad Bilal, Gabriella Bosco, Jingchi Cheng, Alan Pak Tao Lau, Chao Lu
2015 Journal of Lightwave Technology  
A novel low-complexity two-stage digital feedforward carrier phase estimation (CPE) algorithm based on the rotation of constellation points to remove phase modulation for a 64-ary quadrature amplitude  ...  The second stage applies the Viterbi&Viterbi algorithm after the removal of phase modulation through rotation of constellation points.  ...  7) Frequency offset compensation and carrier phase estimation (CPE) using techniques described in this paper. 8) 801-taps least mean square (LMS) filter for performance optimization followed by standard  ... 
doi:10.1109/jlt.2015.2402441 fatcat:drvvxidos5ck5ja6dyhcydxvla

Field measurements of an indoor high-speed QAM wireless system using decision feedback equalization and smart antenna array

J.-F. Frigon, B. Daneshrad
2002 IEEE Transactions on Wireless Communications  
) testbed that features real-time equalization and smart antenna-array technology.  ...  The results underscore the dramatic potential for a system that optimally combines equalization and a smart antenna array.  ...  ACKNOWLEDGMENT The authors would like to thank J. Putnam and E. Berg for their help for the use of the testbed.  ... 
doi:10.1109/7693.975452 fatcat:bprvijbehbgm5ewwdhzzes3ivu

Low-Overhead Low-Complexity Carrier Phase Recovery Technique for Coherent Multi-Band OFDM-Based Superchannel Systems Enabled by Optical Frequency Combs

Faith K. Deynu, Evans W. Akpari, Constant Akama
2021 Journal of Microwaves, Optoelectronics and Electromagnetic Applications  
DD least mean square (DD-LMS) [43] - [45] , differential phase compensated constant-modulus [46] algorithms, provided that the error signal used for the tap update is sensitive to phase rotations.  ...  16-QAM and 20x100 km for 32-QAM signals.  ... 
doi:10.1590/2179-10742021v20i1965 fatcat:bquosynbzrdqxgbl5nqzfdyxxu

Machine Learning Techniques for Optical Performance Monitoring and Modulation Format Identification: A Survey

Waddah Saif, Maged A. Esmail, Amr Ragheb, Tariq Alshawi, Saleh Alshebeili
2020 IEEE Communications Surveys and Tutorials  
This paper surveys ML-based OPM and MFI techniques proposed in the literature. First, we address the key advantages of employing ML algorithms in optical networks.  ...  Then, we review the main optical impairments and modulation formats being monitored and classified, respectively, using ML algorithms.  ...  Decoding subsystem 4-ch ADC subsystem IQ skew removal Timing phase recovery CMA equalization CD -1 Frequency offset compensation Carrier phase recovery MFI Modulation Independent algorithms  ... 
doi:10.1109/comst.2020.3018494 fatcat:qtspg36ylvbvhjil6u5or7seja

Kalman Filtering for Carrier Phase Recovery in Optical Offset-QAM Nyquist WDM Systems

Trung-Hien Nguyen, Christophe Peucheret
2017 IEEE Photonics Technology Letters  
The multi-carrier source has a Kalman Filtering for Carrier Phase Recovery in Optical Offset-QAM Nyquist WDM Systems Trung-Hien Nguyen, Christophe Peucheret I frequency spacing of 30 GHz, which is equal  ...  Carrier phase recovery (CPR) is an indispensable block of receiver-side digital signal processing (DSP). Some CPR methods are now well-established for QAM constellations.  ... 
doi:10.1109/lpt.2017.2701907 fatcat:in2sqdol7zbphbrp6ak63hmvxq

Multi-band CAP for Next-Generation Optical Access Networks Using 10-G Optics

Jinlong Wei, Elias Giacoumidis
2018 Journal of Lightwave Technology  
A novel simple timing recovery approach, partial differential QAM constellation encoding and decoding schemes together with blind multi-modulus algorithms (MMAs) equalization are proposed to address the  ...  Results show that it can offer excellent system tolerance to timing error of at least ±0.1 symbol period even for the highest frequency CAP sub-band.  ...  5j] for QAM-8, QAM-16, and QAM-32, respectively.  ... 
doi:10.1109/jlt.2017.2772894 fatcat:ocvcoeoewrbufbdndsr3preocq

Implementation of Soft Decoding Mechanism for Addressing Nonlinearities in Long-Distance Optical Transmission System

Ammar Armghan
2022 Electronics  
LDOTNs are affected by phase noise and nonlinearities generated inside the fiber.  ...  The CS of the presented LDOTN is then compared to the standard 16-QAM and 64-QAM using international telecommunication union-telecommunication (ITU-T) standard G-652.D and G-657.A1 SMF.  ...  Conflicts of Interest: The author declares no conflict of interest.  ... 
doi:10.3390/electronics11071092 fatcat:dtiupv74mrc3jcpvg4s4puxv6q

Advanced DSP Techniques Enabling High Spectral Efficiency and Flexible Transmissions: Toward elastic optical networks

Alan Pak Tao Lau, Yuliang Gao, Qi Sui, Dawei Wang, Qunbi Zhuge, Mohamed H. Morsy-Osman, Mathieu Chagnon, Xian Xu, Chao Lu, David V. Plant
2014 IEEE Signal Processing Magazine  
DSP units such as chromatic dispersion (CD) compensation, polarization-mode dispersion (PMD) compensation, timing phase recovery (TPR), frequency offset estimation (FOE), as well as carrier phase estimation  ...  These include the constant multimodulus algorithm (CMMA) [15] , the radius-directed equalizer (RDE) [2] , the DD-least radius distance (LRD) algorithm [16] , and the modified-CMA (MCMA) algorithm; the  ... 
doi:10.1109/msp.2013.2287021 fatcat:43gxxzc7czhhxljlxulrh4kggm

Blind Modulation Format Identification Based on Principal Component Analysis and Singular Value Decomposition

Jinkun Jiang, Qi Zhang, Xiangjun Xin, Ran Gao, Xishuo Wang, Feng Tian, Qinghua Tian, Bingchun Liu, Yongjun Wang
2022 Electronics  
Based on square operation and PCA, the influence of phase rotation is removed, which avoids phase rotation-related discussions and training.  ...  Moreover, the proposed method still retains the advantage, even when the number of samples decrease, which is beneficial for low-complexity implementation.  ...  of the subsequent carrier phase recovery algorithm.  ... 
doi:10.3390/electronics11040612 fatcat:uet3343oircoloj573amskml2a
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