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Ultrawide-band photonic time-stretch a/D converter employing phase diversity

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3 Author(s)
Yan Han ; Dept. of Electr. Eng., Univ. of California, Los Angles, CA, USA ; Boyraz, O. ; Jalali, B.

The performance of analog-to-digital converters can be greatly enhanced by preprocessing the analog signal using the photonic time-stretch technique. The analog bandwidth of a time-stretch preprocessor is limited by dispersion-induced frequency fading. In this paper, we propose and demonstrate a new implementation of the time-stretch analog-to-digital (A/D) conversion system that overcomes the bandwidth limitation. It is shown that the fading phenomenon can be mitigated by using phase diversity, and the maximum ratio combining algorithm is identified as a potential technique for maximizing the signal-to-noise-ratio. Real-time A/D conversion at 480 Gsample/s is demonstrated.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:53 ,  Issue: 4 )