IEICE Communications Express
Online ISSN : 2187-0136
Digital feedforward carrier phase estimation for PSK Y-00 quantum-noise randomized stream cipher
Ken TanizawaFumio FutamiOsamu Hirota
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2018 Volume 7 Issue 1 Pages 1-6


Encryption in fiber-optic transmission is one of remaining issues in modern communication systems. One of the solutions is to use Y-00 quantum-noise randomized stream cipher. In this paper, we propose feedforward carrier phase estimation (CPE) with Y-00 decryption process for digital-coherent detection of phase-shift keying (PSK) Y-00 signal. After decryption of Y-00 signal in a digital domain, carrier phase is estimated by calculating Mth power of signal complex amplitude. Numerical simulations for 10-Gbaud PSK Y-00 signal show that the feedforward CPE with decryption process, which is used by a legitimate receiver who shares keys, successfully tracks phase noise. Consequently, penalty-less demodulation of Y-00 signal is achieved.

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© 2018 The Institute of Electronics, Information and Communication Engineers
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