9 November 2016 Self-referenced electrical method for measuring frequency response of high-speed Mach-Zehnder modulators based on two-tone modulation
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Abstract
We demonstrated a self-referenced electrical method for measuring frequency response of high-speed Mach-Zehnder modulators (MZMs) based on two-tone modulation. The modulation index and half-wave voltage can be extracted from the heterodyne ratio of two desired components by properly adjusting bias voltage. The method achieves the electrical domain measurement of the frequency-dependent modulation indices and frequency-dependent half-wave voltages of MZMs without any extra calibration for the responsivity fluctuation in the photodetection. Moreover, it reduces half bandwidth requirements of photodetector and electrical spectrum analyzer by carefully choosing a half frequency relationship of two-tone microwave signals. The consistency between our method and the optical spectrum analysis method verifies the simple but accurate measurement.
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Heng Wang, Heng Wang, Shangjian Zhang, Shangjian Zhang, Xinhai Zou, Xinhai Zou, Yali Zhang, Yali Zhang, Yong Liu, Yong Liu, } "Self-referenced electrical method for measuring frequency response of high-speed Mach-Zehnder modulators based on two-tone modulation", Proc. SPIE 10017, Semiconductor Lasers and Applications VII, 100170X (9 November 2016); doi: 10.1117/12.2247663; https://doi.org/10.1117/12.2247663
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