Spectral amplitude-coding optical CDMA system using Mach-Zehnder Interferometers

TLDR

The authors propose a family of new codes and a SAC‑OCDMA system using Mach‑Zehnder interferometers to suppress phase‑induced intensity noise and eliminate multi‑user interference. The codes, derived from modified prime codes with cross‑correlation not exceeding one, are integrated into the system to achieve the noise and interference mitigation. Numerical simulations demonstrate that the proposed system outperforms modified quadratic congruence codes, enabling a higher number of simultaneous users and a greater total transmission rate.

Abstract

In this paper, we propose a family of newly constructed codes to suppress the phase-induced intensity noise (PIIN) in spectral amplitude-coding (SAC) optical code division multiple access (OCDMA) systems. These new codes are derived from modified prime codes and their cross-correlation is not larger than one. We also present a novel SAC-OCDMA system employing the new codes together with Mach-Zehnder interferometers to eliminate the multi-user interference (MUI). Compared with the systems employing modified quadratic congruence codes (MQC codes), numerical results verify that our proposed system can more effectively suppress the PIIN and eliminate MUI. Hence, the number of simultaneously users and total transmission rate increases significantly.