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  • 1.
    Bae, Cheolyong
    et al.
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    Gustafsson, Oscar
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    FFT-Size Implementation Tradeoffs for Chromatic Dispersion Compensation Filters2023Conference paper (Other academic)
    Abstract [en]

    FIR filtering realized in frequency domain can use different FFT sizes leading to different arithmetic complexities. The implementation results indicate that not only arithmetic complexities must be considered for minimal power consumption.

  • 2.
    Gustafsson, Oscar
    et al.
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    Bae, Cheolyong
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    Shift-and-Add Realization Trade-Offs for Chromatic Dispersion Compensation FIR Filters2022In: Optica Advanced Photonics Congress 2022, Optical Society of America, 2022, article id SpTh1I.3Conference paper (Refereed)
    Abstract [en]

    Approaches to shift-and-add realization of time-domain chromatic dispersion compensation FIR filters are considered. The coefficient word length has larger impact than filter length on both BER penalty and adder complexity.

  • 3.
    Bae, Cheolyong
    et al.
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    Gustafsson, Oscar
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    Finite Word Length Analysis for FFT-Based Chromatic Dispersion Compensation Filters2021In: Signal Processing in Photonic Communications 2021, OPTICA , 2021Conference paper (Refereed)
    Abstract [en]

    Finite word length effects for frequency-domain implementation of chromatic dispersion compensation is analyzed. The results show a significant difference for the different factors when it comes to power consumption and receiver penalty.

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  • 4.
    Bae, Cheolyong
    et al.
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    Gustafsson, Oscar
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    Overlap-Save Commutators for High-Speed Streaming Data Filtering2021In: 2021 IEEE International Symposium on Circuits and Systems (ISCAS), IEEE , 2021Conference paper (Other academic)
    Abstract [en]

    Overlap-save and overlap-add methods enable efficient implementation of FIR filters. In this paper, a compact method for handling the overlap and shuffle of samples for realtime processing using pipelined FFT architectures is presented. It is suitable for cases when the sample rate is equal to or higher than the clock frequency

  • 5.
    Fougstedt, Christoffer
    et al.
    Chalmers Univ Technol, Sweden.
    Gustafsson, Oscar
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    Bae, Cheolyong
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    Borjeson, Erik
    Chalmers Univ Technol, Sweden.
    Larsson-Edefors, Per
    Chalmers Univ Technol, Sweden.
    ASIC Design Exploration for DSP and FEC of 400-Gbitis Coherent Data-Center Interconnect Receivers2020In: 2020 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC), IEEE , 2020Conference paper (Refereed)
    Abstract [en]

    We perform exploratory ASIC design of key DSP and FEC units for 400-Gbit/s coherent data-center interconnect receivers. In 22-nm CMOS, the considered units together dissipate 5 W, suggesting implementation feasibility in power-constrained form factors. (C) 2020 The Authors

  • 6.
    Fougstedt, Christoffer
    et al.
    Chalmers University of Technology, Gothenburg, Sweden.
    Gustafsson, Oscar
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    Bae, Cheolyong
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    Börjesson, Erik
    Chalmers University of Technology, Gothenburg, Sweden.
    Larsson-Edefors, Per
    Chalmers University of Technology, Gothenburg, Sweden.
    ASIC Design Exploration for DSP and FEC of 400-Gbit/s Coherent Data-Center Interconnect Receivers2020Conference paper (Refereed)
    Abstract [en]

    We perform exploratory ASIC design of key DSP and FEC units for 400-Gbit/s coherent data-center interconnect receivers. In 22-nm CMOS, the considered units together dissipate 5 W, suggesting implementation feasibility in power-constrained form factors.

  • 7.
    Bae, Cheolyong
    et al.
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    Larsson-Edefors, Per
    Chalmers University of Technology, Gothenburg, Sweden.
    Gustafsson, Oscar
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    Benefit of Prime Factor FFTs in Fully Parallel 60 GBaud CDC Filters2020Conference paper (Refereed)
    Abstract [en]

    Prime factor algorithms are beneficial in fully parallel frequency-domain implementation of CDC filters and enable a more continuous scaling of filter lengths. ASICimplementation results in 28-nm CMOS for 60 GBd are provided.

  • 8.
    Bae, Cheolyong
    et al.
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    Gustafsson, Oscar
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    High-Speed Chromatic Dispersion Compensation Filtering in FPGAs for Coherent Optical Communication2020In: 2020 30th International Conference on Field-Programmable Logic and Applications (FPL), IEEE, 2020, p. 357-358Conference paper (Refereed)
    Abstract [en]

    Chromatic dispersion is one of the error sources limiting the transmission capacity in coherent optical communication that can be mitigated with digital signal processing. In this paper, the current status and plans of implementation of chromatic dispersion compensation (CDC) filters on FPGAs are discussed. As these high-speed filters are most efficiently implemented in the frequency-domain, different approaches for high-speed FFT-based architectures are considered and preliminary results of fully parallel FFT implementation by utilizing FPGA hardware features are presented.

  • 9.
    Bae, Cheolyong
    et al.
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    Gokhale, Madhur
    Linköping University, Department of Electrical Engineering. Linköping University, Faculty of Science & Engineering.
    Gustafsson, Oscar
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    Garrido Gálvez, Mario
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, Faculty of Science & Engineering.
    Improved Implementation Approaches for 512-tap 60 GSa/s Chromatic Dispersion FIR Filters2018In: 2018 CONFERENCE RECORD OF 52ND ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS, AND COMPUTERS, IEEE , 2018, p. 213-217Conference paper (Refereed)
    Abstract [en]

    In optical communication the non-ideal properties of the fibers lead to pulse widening from chromatic dispersion. One way to compensate for this is through digital signal processing. In this work, two architectures for compensation are compared. Both are designed for 60 GSa/s and 512 filter taps and implemented in the frequency domain using FFTs. It is shown that the high-speed requirements introduce constraints on possible architectural choices. In this work, it is shown that it is not required to use two overlapping FFTs to obtain continuous filtering. In addition, efficient highly parallel implementation of FFTs is discussed and an unproved FFT compared to our earlier work is proposed. The results are compared to using an approach with a shorter FFT and FIR filters.

1 - 9 of 9
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