title: Tunable fractional-order differentiator using an electrically tuned silicon-on-isolator Mach-Zehnder interferometer.
abstract: We propose and experimentally demonstrate a tunable fractional order photonic differentiator using an on-chip electrically tuned Mach-Zehnder interferometer (MZI) structure. The phase shift at the resonant frequency of the MZI varies when applying different voltages, which can implement the fractional differentiation. Due to the large 3-dB bandwidth of the MZI, the differentiator is expected to have an operation bandwidth of several hundred GHz. The proposed fractional order differentiator is demonstrated experimentally. A Gaussian-like pulse with a bandwidth of about 200 GHz is temporally differentiated with a tunable order range from 0.83 to 1.03.
authors.forename: Aoling
authors.initials: A
authors.lastname: Zheng
authors.forename: Ting
authors.initials: T
authors.lastname: Yang
authors.forename: Xi
authors.initials: X
authors.lastname: Xiao
authors.forename: Qi
authors.initials: Q
authors.lastname: Yang
authors.forename: Xinliang
authors.initials: X
authors.lastname: Zhang
authors.forename: Jianji
authors.initials: J
authors.lastname: Dong