光子时间拉伸ADC中的时间弯曲及其抑制
Time Warps in Photonic Time Stretch ADC and Their Mitigation
摘要：
我们展示了一个10 GHz带宽的数字转换器与7有效位的分辨率和52 dB的SFDR，使用光子时间拉伸技术。据我们所知，这是相同带宽下分辨率最高的模数转换器（ADC），SNR比之前的产品至少高出一个数量级。这是通过校正由于时间扭曲引起的失真和由于马赫-曾德尔调制器中的波长依赖性偏置变化引起的非线性而实现的。我们还演示了级联的30个波长交错的时间段与高保真的路径上实现连续时间操作。
英文摘要：
We demonstrate a 10-GHz bandwidth digitizer with 7-effective bits of resolution and 52dB SFDR, using photonic time stretch technique. To the best of our knowledge, this is the highest resolution analog-to-digital converter (ADC) of the same bandwidth, with at least an order of magnitude higher SNR than previously achieved. This is made possible by correction of distortion due to time warps, and non-linearities due to wavelength dependent bias variation in the Mach-Zehnder modulator. We also demonstrate concatenation of 30 wavelength interleaved time segments with high fidelity on the path to achieving continuous time operation.
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