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• W958514695 abstract "Optical code division multiple access (OCDMA) allows signal to be transmitted in anasynchronous manner, and promises high flexibility and simplicity with considerablesecurity. OCDMA harnesses an enormous bandwidth that provides high spectralutilization and efficiency to support multiple, simultaneous active users. However, thismultiple access technique also has impairments such as multiple user interference (MUI)and signal dispersion over distance. Thus, traditional metropolitan area network (MAN)must be developed by considering system performance optimization.Optimization is typically achieved by increasing code length and system complexity, or byapplying a high level of medium access control (MAC) supervision. Numerous code setdevelopments have been proposed to overcome the aforementioned impairments.However, the proposed code sets have not been demonstrated in an actual optical systemthat supports multiple users, particularly in a MAN, which has various noise sources andMUI effects. Thus, the feasibility of these code sets cannot be verified with absolutecertainty. Conventional OCDMA architecture and encoding stage also exhibit variousdeficiencies, including rigid synchronization, fiber delay line (FDL) accuracy issues,stability resulting from environmental fluctuations, high costs, difficulty in fabrication,lack of compactness, and spectral resolution issues. In this work, an optimized model ispresented as an enhanced solution to the limitations of the existing approach to be appliedin a MAN.iiiThis work proposes an integrated formulation that can be realized by three key aspects:differential modulation, optimal optical code design, and the MUI reduction. This workalso addresses the development of an optimized OCDMA architecture that includes atransmitter and a receiver, designed for a MAN. This thesis presents new gratingconfigurations for fiber Bragg grating (FBG) and investigates the possibility of achievingsystem performance optimization in a MAN while considering the effects of various noisesources, non-linearity, and dispersion. The encoding and decoding schemes are designedbased on the bipolar phase shift by using FBG. This work presents optimal gratingconfigurations that embodies the orthogonality aspect and demonstrates consistentperformance in different scenarios: intensity modulation-direct detection, externalmodulation, non-return-to-zero (NRZ)-differential phase shift keying and NRZ-differentialquadrature phase shift keying, thus obtaining satisfactory agreement with the theoreticalanalysis. This work requires minimum MAC supervision and eliminates the need for FDLfor queuing, which is in line with the requirement of real-time delivery.System optimization is achieved by using an integrated formulation that embodies thedifferential modulation approach, optimal grating configurations, and the MUI reduction.This optimization approach is verified by the design parameters, and enhancement isdemonstrated by the performance parameters, which are over 2, 4, 8, and 12 users at bitrates of 1.25 Gbps, 2.5 Gbps, 10 Gbps, and 40 Gbps, respectively, spanning from 5 km to100 km. This integrated optimization formulation extends the maximum allowable singlemodefiber span, which offers error-free transmission for BER ≤ 10-9 and accommodateshigher aggregated traffic capacity than the conventional approach." @default.
• W958514695 created "2016-06-24" @default.
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• W958514695 date "2014-01-01" @default.
• W958514695 modified "2023-09-24" @default.
• W958514695 title "Performance analysis of optical code division multiple access (Ocdma) technique for metropolitan area network / Go Yun Ii" @default.
• W958514695 hasPublicationYear "2014" @default.
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