Transmission of encrypted optical signals in a metropolitan WDM-compatible TON with differential phase-shift keying modulation

In order to provide information security to users in communication networks, encrypt/decrypt techniques has been used in different forms. Recently, all-optical data encryption has gained attention of research community and may represent a great increment in user-level security. In this paper, we use computer simulations to evaluate the transmission of encoded signals through metropolitan WDM-compatible TON. The signals are encoded using a new all-optical cryptography technique proposed in a previous work. Numerical results suggest that signals may be properly decoded after propagation distances that are compatible with those utilized in metropolitan area networks.