Combined Optimization of FFE and DFE Equalizations

Dikhaminjia, Nana; Tsiklauri, Mikheil; Kiguradze, Zurab; He, Jiayi; Drewniak, James L.; Chada, Arun; Mutnury, Bhyrav

doi:10.1109/epeps.2018.8534279

Cited by 9 publications

(5 citation statements)

References 4 publications

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“…The eye-diagrams clearly show that the equalization improves the quality of multi-channel transmission, and hence improved performance can be achieved as compared with the OCN without equalization. BER below 10 −5 and Q-factor of more than 5 are achieved through simulation, which shows better efficiency as compared with other models, which were presented in [14][15][16][17][18].…”

Section: Paper Contributionsmentioning

confidence: 85%

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Adaptive Equalization for Dispersion Mitigation in Multi-Channel Optical Communication Networks

et al. 2019

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Optical communication networks (OCNs) provide promising and cost-effective support for the ultra-fast broadband solutions, thus enabling them to address the ever growing demands of telecommunication industry such as high capacity and end users’ data rate. OCNs are used in both wired and wireless access networks as they offer many advantages over conventional copper wire transmission such as low power consumption, low cost, ultra-high bandwidth, and high transmission rates. Channel effects caused by light propagation through the fiber limits the performance, hence the data rate of the overall transmission. To achieve the maximum performance gain in terms of transmission rate through the OCN, an optical downlink system is investigated in this paper using feed forward equalizer (FFE) along with decision feedback equalizer (DFE). The simulation results show that the proposed technique plays a key role in dispersion mitigation in multi-channel optical transmission to uphold multi-Gb/s transmission. Moreover, bit error rate (BER) and quality factor (Q-factor) below 10 − 5 and above 5, respectively, are achieved with electrical domain equalizers for the OCN in the presence of multiple distortion effects showing the effectiveness of the proposed adaptive equalization techniques.

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Section: Paper Contributionsmentioning

confidence: 85%

“…The multicore fiber has a number of single mode cores, which may either work in a decoupled manner or a coupled manner with a number of super modes. Up to 30 separate cores [16] within a limited fiber diameter (200 µm) have been demonstrated. This is, however, a constantly improving number [17].…”

Section: High Order Mode Fibersmentioning

confidence: 99%

Adaptive Equalization for Dispersion Mitigation in Multi-Channel Optical Communication Networks

et al. 2019

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“…Advanced DSP technology is a prevalent choice to enhance performance while maintaining low costs. Commonly used DSP equalization algorithms are feed-forward equalizer (FFE) [18]- [20] and Volterra equalizer (Vol) [21]- [22], which are the foundation of many state-of-theart equalization approaches. The FFE is the transversal filter, and it can equalize linear damage.…”

Section: Experiments Setup and System Impairmentmentioning

confidence: 99%

SOA Assisted Wavelength Reusing for 25G Colorless PON With Low-Cost 10G EAM

Huang

et al. 2022

IEEE Photonics J.

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This paper demonstrates a C-band 25G colorless passive optical network (PON) based on semiconductor optical amplifier (SOA) and 10G electro-absorption modulator (EAM). The experimental results show that the SOA in the optical network unit (ONU) can erase the downlink signal by taking advantage of the gain saturation feature, realizing the reuse of downstream wavelength. Meanwhile, the SOA gain can compensate for the EAM loss by optimizing the current and injection power. Apart from this, equalization algorithms at the optical line terminal are investigated for linear and nonlinear impairments compensation. Besides, the system robustness to the ASE and the maximum transmission speed are also evaluated. Finally, the system capacity can reach up to 25 Gbps with NRZ format at a bit-error ratio threshold of 2 × 10 −2 , proving that this system is a promising technology for future high-speed colorless 2 × 25G or 4 × 25G Wavelength division Multiplexing (WDM) PON system.

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“…In [12], a new method for obtaining an optimal configuration for FFE and DFE is presented by finding the coefficients for both equalizers simultaneously. In [6], an N-tap decision feedback equalizer is proposed to enhance the signal integrity based on a statistical eye-diagram estimation.…”

Section: Related Workmentioning

confidence: 99%

Adaptation of Feed-Forward Equalizer Settings: A Frequency Domain Analysis Approach

Zaki¹

2019

IJCDS

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Characteristics of the channel has a major effect on the signal integrity. The channel distortion is increased with high-rate data transmission. Feed-Forward Equalizer (FFE) at transmitter side is one of the methods that can be used to compensate the effect of the channel. PCIe-Gen3, 4, and 5 standards specify some constraints on the FFE settings and assign some preset values that can be used based on the effect of FFE on time-domain. In this paper, detailed analysis for the FFE in frequency domain is presented. New preset values are recommended to achieve enhancement on the behavior over different channels. Short and long channel models are created based on the PCIe standard specifications to check the suggested preset values with worst channels. Continuous-Time Linear Equalizer (CTLE) also is modeled to check the effect of FFE with different CTLE boost values. The eye-measurements based on the new preset values is enhanced by 10% with respect to the default preset values in PCIe specifications for short and long channel. Mapping the preset value in the frequency domain helps fine tuning process for FFE settings by facilitating more guidance to get the best FFE settings.

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Combined Optimization of FFE and DFE Equalizations

Cited by 9 publications

References 4 publications

Adaptive Equalization for Dispersion Mitigation in Multi-Channel Optical Communication Networks

Adaptive Equalization for Dispersion Mitigation in Multi-Channel Optical Communication Networks

SOA Assisted Wavelength Reusing for 25G Colorless PON With Low-Cost 10G EAM

Adaptation of Feed-Forward Equalizer Settings: A Frequency Domain Analysis Approach

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