Experimental investigation of SAC/PDM-based OCDMA scheme with FBG-based Lasers over wireless transmission channel

In current study, the two dimensional spectral amplitude coding and polarization division multiplexing-based optical code division multiple access (2D SAC/PDM-based OCDMA) is proposed to transmit the optical coded and polarized signal over wireless transmission channel. The multiple access interference (MAI) cancellation is investigated to further prove the possible transmission of proposed scheme in an air medium under normal atmospheric temperatures. The experimental results show that the desired signal is easily to identify either horizontal or vertical polarization state and then extract the M-sequence of signature address code correctly. The auto-correlation (matched) and cross-correlation (unmatched) scenarios were essentially experimented to prove that MAI is completely cancelled. Hence, compared to conventional one dimensional SAC-OCDMA scheme, the spectral efficiency and simultaneous active users of proposed 2D SAC/PDM-based OCDMA scheme is achieved twice than that of the conventional SAC-OCDMA scheme.