Optoelectronic signal processing for chromatic dispersion mitigation in direct detection systems

Stenio Magalhães Ranzini (Invited author), Francesco Da Ros (Invited author), Henning Bülow (Invited author), Darko Zibar (Invited author)

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    An optical pre-processing structure is used to reduce the burden of digital equalizers and increase transmission reach for a direct detected system impaired by chromatic dispersion. The optical pre-processing consists of the optical signal being sliced into narrow frequency sub-band by an optical filter. Two distinct filters are numerically investigated: an arbitrary waveguide grating (AWG) filter and a series of cascaded Mach-Zehnder delay interferometers (MZDI). Each signal’s spectral slice is detected by a photodetector and used as input for the digital equalizer. Two options are also considered for equalization: a feedforward neural network (NN) equalizer and a recurrent neural network with reservoir computing (RC). The results are analyzed in simulation in terms of signalto-noise penalty at the KP4 forward error correction threshold. The penalty is calculated with respect to a back-toback transmission without equalization. A 32 GBd on-off transmission shows 0 dB penalty at ≈25 km transmission reach with optoelectronic processing with FNN and at ≈40 km with RC.
    Original languageEnglish
    Title of host publicationProceedings of 22nd International Conference on Transparent Optical Networks (ICTON)
    Number of pages2
    Publication date2020
    ISBN (Print)978-1-7281-8423-4
    Publication statusPublished - 2020
    Event22nd International Conference on Transparent Optical Networks - Virtual event, Bari, Italy
    Duration: 19 Jul 202023 Jul 2020
    Conference number: 22


    Conference22nd International Conference on Transparent Optical Networks
    LocationVirtual event
    Internet address


    • Reservoir computing
    • Signal equalization
    • Chromatic dispersion mitigation
    • Short-reach transmission
    • Direct-detection


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