10 Tbit/s QAM Quantum Noise Stream Cipher Coherent Transmission over 160 Km

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Abstract

We describe in detail our recent demonstration of a 10 Tbit/s secure physical layer transmission that we achieved by using digital coherent QAM quantum noise stream cipher (QNSC) and injection-locked WDM techniques. We used an FPGA-based transmitter and receiver to demonstrate a 165 channel polarization-multiplexed WDM 5 Gbaud 128 QAM/QNSC (70 Gbit/s) on-line transmission over 160 km with a spectral efficiency of 6 bit/s/Hz. In the present system, the original 128 QAM data were encrypted in a 1024 × 1024 QAM format using basis information. The encrypted signal was then masked by a large ASE noise, which reduced the detection 'success' probability for an eavesdropper to 0.13% for each symbol. Furthermore, the multiplicity of the original QAM data and the seed keys used to generate the basis information were arbitrarily changed with time, which makes the decryption much more difficult.

Original languageEnglish
Article number9167410
Pages (from-to)1056-1063
Number of pages8
JournalJournal of Lightwave Technology
Volume39
Issue number4
DOIs
Publication statusPublished - 2021 Feb 15

Keywords

  • Optical fiber communication
  • quadrature amplitude modulation
  • quantum cryptography
  • wavelength division multiplexing

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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