Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 37, Issue 17, Pages 4295-4307Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2019.2923249
Keywords
Direct detection; heterodyne detection; implementation complexity; Kramers-Kronig receiver; optical fiber communications; optical filter; short-reach communications
Funding
- European Regional Development Fund (in German: EFRE)
- German Research Foundation (in German: DFG)
- Hector Stiftung
- International Research School for Teratronics
- Karlsruhe School of Optics and Photonics
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We propose a low-complexity digital implementation of the Kramers-Kronig receiver and analyze its performance and complexity. In simulations and experiments, we find that a relatively small number of filter taps is sufficient to achieve a reasonably high accuracy for the phase retrieval and for the reconstruction of the complex field. We show that the Kramers-Kronig receiver performance strongly depends on details of the system design. Unnecessarily broad optical filters decrease the reception quality, because additional noise makes the violation of the minimum-phase condition more likely. Narrow optical filters, however, impose high local oscillator laser stability and reduce the flexibility of this kind of receiver architecture. Further, we demonstrate Kramers-Kronig reception of 16 QAM signals at a net data rate of 267 Gbit/s after transmission over 300 km of standard single-mode fiber. We compare the performance with a conventional intradyne receiver. In a back-to-back setting, we increase the net data rate to 300 Gbit/s.
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