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  • 1.
    Fougstedt, Christoffer
    et al.
    Chalmers University of Technology, Sweden.
    Sheikh, Alireza
    Chalmers University of Technology, Sweden.
    Johannisson, Pontus
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Larsson-Edefors, Per
    Chalmers University of Technology, Sweden.
    Filter Implementation for Power-Efficient Chromatic Dispersion Compensation2018In: IEEE Photonics Journal, ISSN 1097-5764, E-ISSN 1943-0655, Vol. 10, no 4, article id 7202919Article in journal (Refereed)
    Abstract [en]

    Chromatic dispersion (CD) compensation in coherent fiber-optic systems represents a very significant DSP block in terms of power dissipation. Since spectrally efficient coherent systems are expected to find a wider deployment in systems shorter than long haul, it becomes relevant to investigate filter implementation aspects of CD compensation in the context of systems with low-to-moderate amounts of accumulated dispersion. The investigation we perform in this paper has an emphasis on implementation aspects such as power dissipation and area usage, it deals with both time-domain and frequency-domain CD compensations, and it considers both A/D-conversion quantization and fixed-point filter design aspects. To enable an accurate analysis on power dissipation and chip area, the evaluated filters are implemented in a 28-nm fully depleted silicon-on-insulator (FD-SOI) process technology. We show that an optimization of the filter response that takes pulse shaping into account can significantly reduce power dissipation and area usage of time-domain implementations, making them a viable alternative to frequency-domain implementations.

  • 2. Soltanmoradi, R
    et al.
    Wang, Q
    RISE, Swedish ICT, Acreo.
    Qiu, M
    Andersson, J
    RISE, Swedish ICT, Viktoria.
    Transmission of Infrared Radiation Through Metallic Photonic Crystal Structures2013In: IEEE Photonics Journal, ISSN 1097-5764, E-ISSN 1943-0655, Vol. 5, no 5, p. 45000608-Article in journal (Refereed)
  • 3. Soltanmoradi, R.
    et al.
    Wang, Qiu
    RISE, Swedish ICT, Acreo.
    Qiu, M.
    Andersson, Jan Y.
    RISE, Swedish ICT, Acreo.
    Transmission of Infrared Radiation Through Metallic Photonic Crystal Structures2013In: IEEE Photonics Journal, ISSN 1097-5764, E-ISSN 1943-0655, Vol. 5, no 5, p. 4500608-4500608Article in journal (Refereed)
    Abstract [en]

    Monolithic integration of a metallic photonic crystal (mPhC) structure onto semiconductor infrared (IR) photodetectors can enhance the detector performances. In order to experimentally investigate the parameters involved in optimizing the transmission spectra of the mPhC structures matching the detector operating wavelength in mid- and long-wave IR (MWIR and LWIR) regimes, square thin gold (Au) hole arrays having periodicities of 4.0, 3.6, 2.4, and 1.8 ÎŒm with various fill factors were fabricated on Si or GaAs substrates in a wafer scale. The thicknesses of the Au films are 50, 100, and 200 nm, respectively. Through this systemic study, suitable mPhC structures were revealed that can be readily integrated onto our type-II InGaSb-based quantum dot MWIR and LWIR photodetectors.

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