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

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 polariza...

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Bibliographic Details
Published in:Journal of lightwave technology 2021-02, Vol.39 (4), p.1056-1063
Main Authors: Yoshida, Masato, Kan, Takashi, Kasai, Keisuke, Hirooka, Toshihiko, Nakazawa, Masataka
Format: Article
Language:English
Subjects:
Algorithms
Cryptography
Encryption
Field programmable gate arrays
Finite impulse response filters
Noise
Optical fiber communication
Optical transmitters
Quadrature amplitude modulation
quantum cryptography
Receivers
Wavelength division multiplexing
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Summary: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.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2020.3016693