Phase modulation and false data transmission for secure communication

Nowadays, it is important to consider not only the possibility of information multiplexing, but also the security aspect of its transmission. This article presents a novel telecommunication system based on relative phase coding. A highly coherent source is used to transmit data, which consists of a sequence of time intervals of duration ?, each exhibiting a different phase. At the receiver, this sequence propagates through an imbalanced Mach-Zehnder Interferometer (MZI) exhibiting a differential time-delay matching the time-interval duration ?. At the MZI output, two consecutive intervals overlap, and interferences occur. If the phases of two consecutive intervals are identical, constructive interferences produce a binary '1' at the decoder output. Conversely, if the phases of these intervals differ by ?, destructive interferences produce a binary '0'.