Spurious-free dynamic range(SFDR)limited by intermodulation distortions is a usually accepted measure for dynamic performance of a photonic time-stretched analog-to-digital converter(ADC).In this paper,SFDR improvement in a photonic time-stretched ADC based on third-order predistortion is proposed.The third-order predistortion is achieved optically within an integrated dual-parallel Mach–Zehnder modulator(DPMZM).The mechanism of SFDR improvement with third-order predistortion in the DPMZM is theoretically analyzed.Compared with a conventional scheme without predistortion,the experimental results show that the SFDR improvement of∼26 dB in the proposed scheme is proved.
Boyu XuWulue LvJiamu YeJinhai ZhouXiaofeng JinXianmin ZhangHao ChiShilie Zheng
