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Jun 22, 2026Keywords:
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Main Article Content
Polarization encoding and decoding techniques for a 10 Gbps Hybrid FDW-EDW OCDMA system
Abstract
Optical Code Division Multiple Access (OCDMA) is a form of multiple access scheme that allows multiple users to share a common fibre. OCDMA utilize codes depicted by optical spectra/spatial properties. There are various types of OCDMA codes. The most typical OCDMA code used are the Double Weight (DW) family code. The DW family code consists of the Modified Double Weight (MDW), the Enhanced Double Weight (EDW), and the recently developed Flexible Double Weight (FDW) code. Each code has its uniqueness in terms of code weight, basic code users, and code length which contributes to the Bit Error Rate (BER) and signal quality at the receiver. The newly proposed system is the Hybrid FDW/EDW code, which combines FDW and EDW codes using the polarization technique. This approach uses FDW and EDW codes to achieve zero cross-correlation properties within the same wavelength. Each user receives a unique codeword that matches a specific polarization state, making them orthogonal. The selected polarizations are 0º and 90º, which ensure minimal cross-correlation between users with different polarizations. The DW code family is considered a non-hybrid system in this research. According to the results obtained in this study, Hybrid systems outperform non-hybrid systems in terms of BER and transmission distance. Hybrid FDW/EDW systems can achieve a range of up to 80 km, while non-hybrid FDW systems can reach up to 60 km, and non-hybrid EDW systems can reach up to 50 km. This indicates that the proposed hybrid system shows a 60% improvement over non-hybrid EDW systems and a 33.33% improvement over non-hybrid FDW systems.
