Development of new two-dimensional spectral/spatial code based on dynamic cyclic shift code for OCDMA system

• Published in: Optical fiber technology 2017-07, Vol.36, p.26-32
• Main Authors: Jellali, Nabiha, Najjar, Monia, Ferchichi, Moez, Rezig, Houria
• Format: Article
• Language: English
• Subjects: Data rate; Dynamic cyclic shift codes (DCS); Effective transmitted power; Multiple access interference (MAI); Spectral amplitude codes (SAC); Spectral width
• ISSN: 1068-5200; 1095-9912
• DOI: 10.1016/j.yofte.2017.02.002

•This paper presents a new two-dimensional spectral/spatial codes family, namely two dimensional dynamic cyclic shift codes (2D-DCS).•The 2D-DCS codes are derived based on the dynamic cyclic shift code for the spectral and spatial coding.•The proposed system can fully eliminate the multiple access interference (MAI) by using the MAI cancellation property.•In comparison with existing 2D codes, such as 2D perfect difference (2D-PD), 2D Extended Enhanced Double Weight (2D-Extended-EDW) and 2D hybrid (2D-FCC/MDW) codes, the numerical results show that our proposed codes have better performance.•Therefore, the proposed code can accommodate more active users with low bit error rate.•For the same actives users and same code length, it provides a higher data rate and needs a lower effective transmitted power than the other codes. In this paper, a new two-dimensional spectral/spatial codes family, named two dimensional dynamic cyclic shift codes (2D-DCS) is introduced. The 2D-DCS codes are derived from the dynamic cyclic shift code for the spectral and spatial coding. The proposed system can fully eliminate the multiple access interference (MAI) by using the MAI cancellation property. The effect of shot noise, phase-induced intensity noise and thermal noise are used to analyze the code performance. In comparison with existing two dimensional (2D) codes, such as 2D perfect difference (2D-PD), 2D Extended Enhanced Double Weight (2D-Extended-EDW) and 2D hybrid (2D-FCC/MDW) codes, the numerical results show that our proposed codes have the best performance. By keeping the same code length and increasing the spatial code, the performance of our 2D-DCS system is enhanced: it provides higher data rates while using lower transmitted power and a smaller spectral width.