Generation of orthogonally polarized chaotic waveforms for secure optical communication

In this paper, we report on generation of orthogonal polarization chaotic wave forms using erbium doped fiber ring laser (EDFRL). A linear birefringent element is used in fiber ring laser cavity to split the pulse in its orthogonal components. These two orthogonal components are used to generate orthogonal chaotic waveforms, when the EDFRL is driven in the chaotic regime. Dual polarization chaotic waveforms double the transmission capacity compared to a single polarization chaotic waveform. Furthermore, the system cost does not increase substantially by the addition of the birefringent element in the erbium doped fiber ring laser.