Ripple suppression in broadband microwave photonic phase shifter frequency response

Weicheng Xia, Ruiqi Zheng, Bijuan Chen, Erwin H.W. Chan, Xudong Wang, Xinhuan Feng, Bai Ou Guan

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    Abstract

    This paper presents a detailed investigation on the cause of ripples in the frequency response of a microwave photonic phase shifter implemented using a 90° hybrid coupler. It was found that an unwanted radio frequency (RF) modulation sideband is generated at the modulator output due to the 90° hybrid coupler amplitude and phase imbalance. This resulted in phase shifter output RF signal amplitude variation and phase deviation. Experimental results demonstrated that incorporating an optical filter in the phase shifter structure can reduce the amplitude variation and phase deviation from 4.2 dB to 2.2 dB and from ±12° to ±3.8°, respectively, over a wide frequency range. A comparison of the loss and the dynamic range of the microwave photonic phase shifter implemented using a 90° hybrid coupler with a conventional fiber optic link is also presented.

    Original languageEnglish
    Article number2433
    Pages (from-to)1-10
    Number of pages10
    JournalApplied Sciences (Switzerland)
    Volume8
    Issue number12
    DOIs
    Publication statusPublished - 30 Nov 2018

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