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Advanced DSP for 400 Gb/s and Beyond Optical Networks
2014
Journal of Lightwave Technology
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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]
2019
arXiv
pre-print
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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
2015
2015 Opto-Electronics and Communications Conference (OECC)
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Circular harmonic expansion-based carrier frequency offset estimation is investigated for optical MQAM 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 MQAM 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
2022
Chinese Optics Letters (COL)
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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
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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
2017
Advances in Radio Science
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<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
2015
Journal of Lightwave Technology
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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
2002
IEEE Transactions on Wireless Communications
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) 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
2021
Journal of Microwaves, Optoelectronics and Electromagnetic Applications
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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
2020
IEEE Communications Surveys and Tutorials
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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
2017
IEEE Photonics Technology Letters
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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
2018
Journal of Lightwave Technology
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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
2022
Electronics
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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
2014
IEEE Signal Processing Magazine
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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
2022
Electronics
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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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