Comparison of Coarse Frequency-Offset Estimation Algorithms for Coherent Passive Optical Networks

Conference: Photonische Netze - 22. ITG-Fachtagung
05/19/2021 - 05/20/2021 at Online

Proceedings: ITG-Fb. 297: Photonische Netze

Pages: 4Language: englishTyp: PDF

Adib, Md Mossadek Hossain; Fuellner, Christoph; Randel, Sebastian (Institute of Photonics and Quantum Electronics (IPQ), Karlsruhe Institute of Technology, Karlsruhe, Germany)

It is expected, that future passive optical networks (PONs) operating at 100 Gbit/s or beyond, will require coherent reception and higher order modulation both in the optical line terminal (OLT) and in the optical network units (ONUs). However, the ONU is a cost sensitive element and thus has to be based on low-cost DFB lasers, whose emission wavelength can vary within a certain range. In a time-division multiplexing (TDM) PON, each upstream burst will thus feature a different frequency offset. In this work, we discuss a coherent PON architecture based on a frequency-comb laser and study complexity-vs.-performance trade-offs for different data-aided and non-data-aided frequencyoffset estimation schemes.