Design an efficient SAC–OCDMA system based on coherent and incoherent optical sources to reduce capital expenditure

Abstract

Merging two coherent and incoherent optical sources: continuous wave light amplification by stimulated emission of radiations (CW LASER) and light emitting diode (LED) despite the difference in their physical nature from each other could be an efficient approach to expand a highly occupied network while trading-off the cost. In this paper, an efficient SAC–OCDMA system based on coherent and incoherent optical sources (CCIS) is designed. To evaluate CCIS design, fixed right shifting (FRS) code is adopted. FRS is built by utilizing specific type of Jordan matrices with direct algebraic procedures with minimum cross correlation (MCC). Additionally, an MCC elimination process would be more efficiency and can be seen in supporting large number of users. A quantitative comparison between SAC–OCDMA system using LED, CW laser sources and CCIS design is presented. Compared to LED sources, a CCIS design increases the number of supported users by almost three time while a reduction in number of optical sources is obtained by ≈ 50%. As compared to CW Laser sources, a CCIS design shows a reduction in number of optical sources by almost 50% while a lessening in number of supported users by ≈ 21%. A 22.6% cost saving per user is achieved for CCIS design over CW laser for nearly similar performance. It concludes that, CCIS design can provide a good solution for optical communication system.