Mohd Ridzuan, Noridah (2023) A modelling approach of 2D and 3d carrierless amplitude phase modulation using vcsel in access network transmission system. Doctoral thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Multi-dimensional carrierless amplitude and phase (CAP) modulation format is a high spectral efficiency modulation format, which allows realization of high order data modulation by employing a digital finite impulse response (FIR) filter with several taps to generate orthogonal waveforms. The reduction in system structure complexity makes CAP modulation format attractive and versatile since it requires relatively less computation and low implementation cost. However, experimental work is the most common practice when implementing the CAP signal using vertical cavity surface emitting laser (VCSEL) in optical transmission system. The experimental work may be constrained by several factors, for example, the availability or high cost of the intended equipment, limitation of time and lab usage, and logistic factor. The equipment and facilities also may affect the design as one cannot regulate or control the conditions as desired. Therefore, a 2D and 3D CAP modulation using VCSEL in access network transmission system is modelled via MATLAB program. The 2D and 3D CAP signal is transmitted using VCSEL through 20 km of single mode fiber (SMF) transmission. A bit error rate (BER) below a forward error correction (FEC) limit of 2.8 × 10−3 for error-free reception is obtained. Spectral efficiencies of 1.89 b/s/Hz and 1.33 b/s/Hz are reported for 2D-CAP-4 and 3D-CAP-4, respectively. The 2D-CAP-4 and 3D-CAP-4 performance using VCSEL for 20 km of SMF transmission is compared with the previous experimental works where the results show a 5.6 dB and 5.4 dB power penalty, respectively, hence prove the validity of the developed 2D and 3D CAP-VCSEL transmission system model for access network environment. This modelling graphically represents how things might look and helps to gain insight into which parameters are most important and significant to the system performance. As a result, this modelling can become a good alternative as it allows the understanding of the research work in an ideal setting and its potentially near-to-actual performance can be a guideline before the real-time implementation takes place

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