High speed and high resolution optical sampler for optical analog-to-digital converter.

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We compered two optical sampling schemes based on four wave mixing(FWM) and nonlinear optical loop mirror. The scheme based on FWM is suitable for high time resolution operation. Another scheme based on NOLM is suitable for low power consumption. Then, we investigate the performance of proposed ADC scheme about effective resolution. The transfer functions have a potential to increase by ENOB(Effective number of bit) of 4.08 bit. Finally, we have demonstrated real-time optically resolution enhanced ADC system using optical transfer functions of NOLMs. The coarse power level of low resolution ADC has been interpolated by the resolution enhancement scheme. However, the decoded signal has been degraded by noises in NOLMs. This problem will be improved by taking into the noises for setting the coding table.