Novel security enhancement technique against eavesdropper for OCDMA system using 2-D modulation format with code switching scheme

•The novel spectrally encoded OCDMA system based upon 2-D modulation is investigated.•This is an effective approach for simultaneous improvement of the system capacity and security.•After comparison of existing state-of-the-art schemes we have proven that our proposed setup is better.

In this paper, security of the spectrally encoded-optical code division multiplexed access (OCDMA) system is enhanced by using 2-D (orthogonal) modulation technique. This is an effective approach for simultaneous improvement of the system capacity and security. Also, the results show that the hybrid modulation technique proved to be a better option to enhance the data confidentiality at higher data rates using minimum utilization of bandwidth in a multiuser environment. Further, the proposed system performance is compared with the current state-of-the-art OCDMA schemes.