For access to this article, please select a purchase option:
Buy conference paper PDF
Buy Knowledge Pack
IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.
We investigate a technique to improve the information confidentiality in optical fibre telecommunications. Starting from a basic scheme of unconventional coding technique applied to a 3-dimensional polarization shift keying we extend the method to a 4-dimensional physical space [2] in order to demonstrate the general applicability of the cryptographic method and to achieve better performances in terms of transmission throughput. BER is calculated for hypercube constellation modulation in 2, 3 and 4 dimensions and an interesting relation between BER, transmission power and space dimension is derived.