A New DSP-Based Physical Layer Encryption Technique Applied to Passive Optical Networks

• Autor(a) principal: Francisco Abbade, Marcelo Luis [UNESP]
• Data de Publicação: 2018
• Outros Autores: Silva Lessa, Leonardo [UNESP], Oliveira Santos, Melissa De [UNESP], Jose Do Prado, Afonso [UNESP], Aldaya, Ivan [UNESP]
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1109/ICTON.2018.8473949; http://hdl.handle.net/11449/186998
• topic: digital signal processing; passive optical networks; physical layer security

Point-to-multipoint architecture poses serious security problems to passive optical networks (PONs). In this paper, we propose the use of a new digital signal processing (DSP)-based technique to improve the confidentiality of signals traveling through PONs. The technique consists of phase-shifting and delaying the spectral components of baseband signals that further modulate optical carriers. Our simulation analysis encompasses the application of the technique to binary phase-shift keying (BPSK) in an intensity modulated-direct detection (IM-DD) system. Results reveal that the encrypted signals may be properly decoded even when 64 PON users are considered and suggest the potential of the proposed technique for practical implementations. From a security point of view, we show that the proposed technique utterly outperforms the Advanced Encryption Standard (AES) in brute force attacks.