Bit-by-bit optical code scrambling technique for secure optical communication

Xu Wang, Zhensen Gao, Xuhua Wang, Nobuyuki Kataoka, Naoya Wada

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


We propose and demonstrate a novel bit-by-bit code scrambling technique based on time domain spectral phase encoding/decoding (SPE/SPD) scheme using only a single phase modulator to simultaneously generate and decode the code hopping sequence and DPSK data for secure optical communication application. In the experiment, 2.5-Gb/s DPSK data has been generated, decoded and securely transmitted over 34km by scrambling five 8-chip, 20-Gchip/s Gold codes with prime-hop patterns. The proposed scheme can rapidly reconfigure the optical code hopping sequence bit-by-bit with the DPSK data, and thus it is very robust to conventional data rate energy detection and DPSK demodulation attack, exhibiting the potential to provide unconditional transmission security and realize even one-time pad. (C) 2011 Optical Society of America

Original languageEnglish
Pages (from-to)3503-3512
Number of pages10
JournalOptics Express
Issue number4
Publication statusPublished - 14 Feb 2011


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