Demonstration of Stealthy and Encrypted Optical Transmission Below Adjacent 50 GHz DWDM Channels

Eyal Wohlgemuth, Yaron Yoffe, Pantea Nadimi Goki, Muhammad Imran, Francesco Fresi, Luca Potì, Dan Sadot

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


A stealthy and encrypted transmission is demonstrated in a dense-WDM network. The residual gap between two neighboring commercial channels is utilized for the transmission of the secured channel, hidden below the amplifier noise at negative -10 dB/0.1nm OSNR. The stealthy and encrypted channel is generated by a digital replication of the baseband signal together with a digital spectral phase mask. This technique provides encryption and steganography as it exclusively allows the eligible user to obtain a considerable processing-gain, and to recover extremely low OSNR signals. In this work the secured channel is explored under stringent network conditions. A stealth transmission was tested between two high OSNR public channels, separated 50 GHz apart: Unshaped 25 Gbps NRZ channel and digitally shaped coherent PM-QPSK 112 Gbps channel. Although it is significantly overlapped by adjacent channels and covered by the ASE noise, we demonstrate error-free detection of the secured channel, without significant effect on the commercial channels.

Original languageEnglish
Article number9057582
Pages (from-to)581-584
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number10
StatePublished - 15 May 2020


  • Optical communication
  • communication system security
  • homodyne detection
  • phase coding
  • quadrature phase shift keying
  • signal processing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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