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Feedforward Weighted-Samples Based Carrier Frequency Offset Compensation in Optical Coherent M-QAM Systems
2017
2017 European Conference on Optical Communication (ECOC)
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A low-complexity feedforward CFO compensation method is proposed and numerically validated for both square and cross M-QAM modulation in optical coherent systems. ...
The proposed method is further compared to state-of-the-art methods and its effectiveness is experimentally verified in a 10-GBaud 16-QAM system. ...
Introduction M−ary quadrature amplitude modulation (M−QAM) signals and coherent detection have become the key technologies for next-generation 400 Gbit/s per channel optical transmission systems 1 . ...
doi:10.1109/ecoc.2017.8345923
fatcat:x4a54ahmmrerxk25dkvf455l24
Adaptive joint-polarization carrier phase recovery for optical coherent communication
2013
2013 8th International Conference on Communications and Networking in China (CHINACOM)
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We present a carrier phase recovery algorithm to jointly compensate frequency offset and carrier phase noise based on the widely-used Viterbi and Viterbi phase estimation (VVPE) algorithm with reduced ...
DSP algorithms with low computational complexity and feedforward (FF) structure are highly desirable in high baud rate optical coherent receivers. ...
Carrier phase recovery (CPR), including frequency offset compensation (FOC) and carrier phase estimation (CPE), is a key task in the DSP part of digital coherent receivers to restore signal constellation ...
doi:10.1109/chinacom.2013.6694707
fatcat:ynojlqt3tzbf3pn6bq4ij3dj5y
Coded Modulation and Impairment Compensation Techniques in Optical Fiber Communication
[chapter]
2021
Fiber Optics [Working Title]
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This chapter deals with coded modulation and impairment compensation techniques in optical fiber communication. ...
On the other hand, in order to meet the demand of transmission rate of next generation high speed optical communication systems, multi-dimensional modulation and coherent detection are sufficiently applied ...
Quadrature amplitude modulation (QAM) is commonly used in coherent optical fiber transmission system. ...
doi:10.5772/intechopen.98811
fatcat:5mkytzm6mfflnnr6bo32mg4e74
Machine Learning Techniques to Mitigate Nonlinear Phase Noise in Moderate Baud Rate Optical Communication Systems
[chapter]
2019
Intelligent System and Computing [Working Title]
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Improvements of 3.2 dB for 16-QAM, and 1.4 dB for 4+12 PSK in the OSNR scale as a function of the bit error rate are obtained without requiring additional compensation algorithms. ...
Phase-offset and in-phase and quadrature imbalance may be detected on the received constellation and compensated by applying thresholding boundaries obtained from impairment characterization through statistical ...
It has the role of compensating the PN, directly related to the frequency noise of the lasers employed as optical carriers in the system. ...
doi:10.5772/intechopen.88871
fatcat:rpvsp6wixndo3b2phdasfpyaie
DSP for Coherent Single-Carrier Receivers
2009
Journal of Lightwave Technology
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Abstract-In this paper, we outline the design of signal processing (DSP) algorithms with blind estimation for 100-G coherent optical polarization-diversity receivers in single-carrier systems. ...
In particular, we first present a new and fast algorithm to perform blind adaptive CD compensation through frequency-domain equalization. ...
Feedback or feedforward algorithms can be used to compensate for the LO phase offset [31] . ...
doi:10.1109/jlt.2009.2024963
fatcat:o4cjmvfy6fbwxe5m2p7ha5jz4m
Applications of Kalman Filters for Coherent Optical Communication Systems
[chapter]
2018
Kalman Filters - Theory for Advanced Applications
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In this chapter, we review various applications of Kalman filtering for coherent optical communication systems. ...
Frequency and phase offset estimation using a two stage linear Kalman filter (LKF)/EKF is also discussed. ...
Acknowledgements The authors gratefully acknowledge the support of the Erlangen Graduate School in Advanced Optical Technologies (SAOT) funded by the German National Science Foundation (DFG) in the framework ...
doi:10.5772/intechopen.71617
fatcat:ktpwjl72nfa6vdxkpwenf27na4
Joint-Polarization Phase-Noise Estimation and Symbol Detection for Optical Coherent Receivers
2016
Journal of Lightwave Technology
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The problem of optimal symbol detection in the presence of laser phase noise is studied, for uncoded polarizationmultiplexed fiber-optic transmission. ...
Furthermore, a pilot-based algorithm that approximates the MAP symbol detector is developed, using approaches adopted from the wireless literature. ...
As the phase of the optical carrier is used to convey information in coherent transmission, phase recovery at the receiver is imperative for successful symbol detection. ...
doi:10.1109/jlt.2016.2593981
fatcat:lwd253hk6vha5cle2pzjcl4x5i
Pilot-aided carrier phase recovery for M-QAM using superscalar parallelization based PLL
2012
Optics Express
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In this paper, we present a carrier phase recovery (CPR) algorithm using a modified superscalar parallelization based phase locked loop (M-SSP-PLL) combined with a maximum-likelihood (ML) phase estimation ...
In 28 Gbaud QPSK (112 Gb/s) and 16-QAM (224 Gb/s), and 7 Gbaud 64-QAM (84 Gb/s) experiments, it is also demonstrated that M-SSP-PLL + ML can increase the transmission distance by at least 12% compared ...
Carrier phase recovery (CPR) is an indispensible digital signal processing (DSP) procedure in coherent transmission systems to compensate for the random phase shifts induced by both the transmitter laser ...
doi:10.1364/oe.20.019599
pmid:23038601
fatcat:h7h37afzsbh6ffqwr3gbhz3prm
An Energy Efficient 56 Gbps PAM-4 VCSEL Transmitter Enabled by a 100 Gbps Driver in 0.25 μm InP DHBT Technology
2016
Journal of Lightwave Technology
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In particular, oscillator phase noise increases with the carrier frequency. An analog phase noise mitigation technique is proposed for arbitrary mm-wave signal waveforms [F]. ...
The digital receiver in [B], on the other hand, relaxes requirements on the sampling speed thus being cost and power efficient. ...
It is their unconditional love that supports me in pursuing my goals and being myself. I love you very much! ...
doi:10.1109/jlt.2016.2600591
fatcat:e5nz6matqnbpnnk7hhnxrwkhuq
Terahertz Technologies to Deliver Optical Network Quality of Experience in Wireless Systems Beyond 5G
[article]
2018
arXiv
pre-print
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This article discusses the basic system architecture for terahertz (THz) wireless links with bandwidths of more than 50 GHz into optical networks. ...
New design principles and breakthrough technologies are required in order to demonstrate Tbps data-rates at near zero-latency using the proposed system concept. ...
In recent years, there has been great progress reported in developing mitigation schemes for carrier PHN, nonlinear dispersion, and IQ imbalance for coherent fiber optical systems enabling 64-QAM in future ...
arXiv:1803.09060v1
fatcat:us56oatg2bd2vd4c5d7nlg453y
Terahertz Technologies to Deliver Optical Network Quality of Experience in Wireless Systems Beyond 5G
2018
IEEE Communications Magazine
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This article discusses the basic system architecture for terahertz (THz) wireless links with bandwidths of more than 50 GHz into optical networks. New design principles and breakthrough technologies ...
In recent years, there has been great progress reported in developing mitigation schemes for carrier PHN, nonlinear dispersion, and IQ imbalance for coherent fiber optical systems enabling 64-QAM in future ...
We highlight that the carrier phase recovery in the presence of PHN by feedforward algorithms become more robust for higher symbol rates [11] . ...
doi:10.1109/mcom.2018.1700890
fatcat:k2sfo2i22re4hfxtmclrzadm4u
Scaling technologies for terabit fiber optic transmission systems
2011
Optoelectronic Integrated Circuits XIII
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based on coherent optical receivers. ...
The coming decade promises to demand more capacity and bandwidth in these networks and it is in this context that we present our work on scaling technologies for terabit fiber optic transmission systems ...
Coherent Optical Orthogonal Frequency Division Multiplexing Following the recent surge of interest in digital signal processing (DSP) for optical fiber communications, coherent optical orthogonal frequency ...
doi:10.1117/12.880247
fatcat:mfgceyfwavczxfp6qo7b3bjhde
A family of Nyquist pulses for coherent optical communications
2012
Optics Express
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A new family of Nyquist pulses for coherent optical single carrier systems is introduced and is shown to increase the nonlinearity tolerance of dual-polarization (DP)-QPSK and DP-16-QAM systems. ...
Numerical investigations for a single-channel 28 Gbaud DP-16-QAM longhaul system without optical dispersion compensation indicate that the proposed pulse can increase the reach distance by 26% and 19%, ...
Background The effect of pulse shaping in optical coherent systems without optical dispersion compensation has recently been investigated in [1] [2] [3] . ...
doi:10.1364/oe.20.008397
pmid:22513549
fatcat:soenxvwc3bc4bcdduihf5h774y
Spectrally and Power Efficient Optical Communication Systems
[article]
2018
arXiv
pre-print
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Increased traffic demands globally and in particular in short-reach links in data centers will require optical communication systems to continue scaling at an accelerated pace. ...
Nevertheless, energy constraints start to limit the bit rate that can be practically transmitted over optical systems both at the shortest distances in data centers and at the longest distances in ultra-long ...
DSP-based coherent detection systems can use higher-order modulation, such as 16-QAM, to reduce the bandwidth required of electro-optic components. ...
arXiv:1806.01945v1
fatcat:3wcwlgfqenaize5qwhhesjm2bm
Filtered Carrier Phase Estimator for High-Order QAM Optical Systems
2018
Journal of Lightwave Technology
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We investigate, using Monte Carlo simulations, the performance characteristics and limits of a low-complexity filtered carrier phase estimator (F-CPE) in terms of cycleslip occurrences and signal to noise ...
In this work, the F-CPE algorithm has been extended to include modulation formats whose outer-ring symbols have a QPSK symmetry, and which are applicable to metro and long-haul optical networks: QPSK, ...
In QPSK-based 100G systems, and in a general m-PSK case, phase noise can be efficiently compensated using the feedforward Viterbi & Viterbi algorithm [2] , which uses the rotational symmetry of m-PSK ...
doi:10.1109/jlt.2018.2829153
fatcat:c4pyi56nind6hotdm4gak3st6a
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