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• W1528278189 abstract "An optical wireless transmission technique represents an attractive choice for manyindoor and outdoors applications within fixed and mobile networks. It has the advantage ofproviding a wide bandwidth that is unregulated worldwide, with availability to use it in avery dense fashion, and potentially very low cost. Due to the high attenuation suffered byInfrared radiation through the air, operating low power transmission sources, and generallyadverse signal to the noise environment found by ambient background light, where theoptical signal is typically at it is minimum power level when detected. A high sensitivityand high selectivity receiver will be imperative for such applications as subcarriermultiplex systems, millimetre-wave radio over fibre and other wireless optical systemapplications.The thesis details the research, design, and optimisation of a novel, low-noise frontendoptical receiver concept using a photoparametric amplifier (PPA) technique, in whichthe detected optical baseband signal is electrically amplified and up-converted to uppersidefrequency, based on the nonlinear characteristic of the pin photodiode junction; thedesired signal passes through a further signal processing stage, and the original basebandsignal is recovered again, using the concept of the superheterodyne principle. The designedDCHPPA receiver acts in a parallel manner to a conventional double superheterodynedetector system, but without the noise penalty normally incurred in the first stage. The PPAis used instead of a resistive/transistor based mixer at the first stage. DCHPPAs have theproperties to provide very high gain, with high selectivity, combined with a very low noiseoperation.The research is conducted from three aspects: theoretical analysis, modelling andsimulation, and practical implementation and result analysis. The three approachesfollowed the same trend shown, and the results correspond closely with each other.Theoretically, a new non-degenerate PPA mode of operation is discussed, in which theapplied dc bias to the pin photodetector is replaced by the applied ac pump signal. This isshown to be advantageous in terms of the desirable characteristics for PPA operation,leading to improved conversion efficiency and the potential for low noise operation. PPAwas shown to behave more optimally with load resistance which was much lower thannormally used in the common optical wireless receiver-amplifiers. A new PPA gain theorywas derived and optimised accordance with the original gain theory, PPA input/outputadmittance power was analysed for optimum power transfer. More accurate DCHPPAcircuit configurations were modelled and simulated using nonlinear simulator tools (AWR)which help to understand and optimise system performance, particularly device parametersand characteristics. The full DCHPPA system was implemented practically, and tested inVHF and UHF as a sequel to the simulation configuration, which subsequently exhibited a34.9dB baseband signal over the modulated optical signal; by employing a chain gainDCHPPA cascaded configuration, 56.3 dB baseband signal gain was achieved. The PPAnoise was also measured and analysed, which satisfied the tough front-end optical systemrequirements." @default.
• W1528278189 created "2016-06-24" @default.
• W1528278189 creator A5032974313 @default.
• W1528278189 date "2012-06-01" @default.
• W1528278189 modified "2023-09-23" @default.
• W1528278189 title "Theory and optimisation of double conversion heterodyne photoparametric amplifier" @default.
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• W1528278189 hasPublicationYear "2012" @default.
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