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

比较了基于四波混频和非线性光环路镜的两种光学采样方案。基于FWM的方案适合于高时间分辨率的操作。另一种基于NOLM的方案适用于低功耗。然后，我们研究了所提出的ADC方案在有效分辨率方面的性能。传递函数有可能增加4.08比特的ENOB（有效比特数）。最后，我们演示了利用nolm的光学传递函数增强实时光学分辨率的ADC系统。采用分辨率增强方案对低分辨率ADC的粗功率电平进行插值。然而，编码后的信号会受到噪声的影响。通过在编码表的设置中考虑噪声，可以改善这一问题。

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.