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A New Method of Evaluating Signal Quality for Systems to which Partial Response and Maximum Likelihood Is Applied
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2003
Year
EngineeringPrml DetectionMeasurementOptical Transmission SystemSound QualityOptical TestingSignal IntegrityStatistical Signal ProcessingOptical PropertiesSystems EngineeringOptical SystemsSignal DetectionMaximum LikelihoodNew MethodPhotonicsPartial ResponseComputer EngineeringInverse ProblemsChannel EstimationSignal ProcessingOptoelectronicsEvaluating Signal QualityOptical Information ProcessingOptical EngineeringOptical System Analysis
The partial response and maximum likelihood (PRML) detection method is promising as a detection scheme for next-generation optical disk systems. For application of the PRML detection, a new value is required in order to evaluate signal quality instead of jitter, which is used in current optical disk systems. For this requirement, we developed a new evaluation method that is based on the principle of the PRML detection. This evaluation value is defined as the occurrence probability of miss-detection in the PRML detection. We evaluated the proposed method using a simulated waveform and an experimental waveform for two systems. Each system consists of a phase change disk with cover layer thickness of 0.6 mm and 0.1 mm, a blue laser with wavelength of 409 nm and 407 nm and an objective lens with numerical aperture of 0.65 and 0.85, respectively. As a result, we confirmed the validity of the proposed method for each system.