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Experimental investigation of security gaps when using punctured LDPC coding in coherent systems up to 64-GBd DP-64QAM

: Schmidt-Langhorst, C.; Pfeiffer, J.; Elschner, R.; Frey, F.; Emmerich, R.; Fischer, R.F.H.; Schubert, C.

Kirstädter, A. ; Informationstechnische Gesellschaft -ITG-; Informationstechnische Gesellschaft -ITG-, Fachausschuß 5.3 Optische Nachrichtentechnik; Informationstechnische Gesellschaft -ITG-, Fachgruppe 5.3.3 Photonische Netze:
Photonische Netze : Beiträge der 20. ITG-Fachtagung, 08.-09. Mai 2019, Hochschule für Telekommunikation Leipzig
Berlin: VDE Verlag, 2019 (ITG-Fachbericht 287)
ISBN: 978-3-8007-4959-1
ISBN: 978-3-8007-4960-7
Fachtagung Photonische Netze <20, 2019, Leipzig>
Fraunhofer HHI ()

In optical transmission systems, security against eavesdroppers is of increasing importance. Following the concept of physical-layer security, we experimentally quantify the security gap that can be achieved when applying punctured low-density parity-check (LDPC) codes for various modulation schemes and bit rates in a state-of-the art laboratory coherent optical communication system. We examine operating points at gross bit-rates up to 768 Gb/s using up to 64.0-GBd dual-polarization (DP) 64-ary quadrature amplitude modulation (QAM) in combination with bit-interleaved coded modulation (BICM). We find that security gaps ranging from 5.6 dB for a net secure data rate of 76.2 Gb/s (32-GBd DP-QAM04) up to 10.7 dB for 457 Gb/s (64-GBd DP-QAM64) are required for the legitimate receiver over the eavesdropper. For the low-cardinality DP-QAM04 format the required security gap is mainly equal to the theoretically achievable minimum security gap. However, with increasing cardinalit y of the modulation format, the practical implementation penalty accounts for a significant portion of the security gap of up to an additional 3.7 dB at 64-GBd DP-QAM64.