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Frontiers of Optoelectronics

ISSN 2095-2759

ISSN 2095-2767(Online)

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Front. Optoelectron.    2021, Vol. 14 Issue (4) : 426-437    https://doi.org/10.1007/s12200-020-1010-6
RESEARCH ARTICLE
Optical generation of UWB pulses utilizing Fano resonance modulation
Zhe XU, Yanyang ZHOU, Shuhuang CHEN, Liangjun LU, Gangqiang ZHOU, Jianping CHEN, Linjie ZHOU()
State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Key Laboratory of Navigation and Location Services, Shanghai Institute for Advanced Communication and Data Science, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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Abstract

In this paper, we reported an integrated method to generate ultra-wideband (UWB) pulses of different orders based on a reconfigurable silicon micro-ring resonator-coupled Mach–Zehnder interferometer. Under proper operating conditions, the device can produce Fano resonances with a peak-to-valley extinction ratio of above 20 dB. UWB monocycle and doublet signals with picosecond pulse widths are produced when the micro-ring resonator is modulated by square and Gaussian electrical pulses, respectively. With our Fano resonance modulator on silicon photonics, it is promising to foresee versatile on-chip microwave signal generation.
Keywords ultra-wideband (UWB) generation      Fano resonance      intensity modulation      integrated silicon modulator     
Corresponding Author(s): Linjie ZHOU   
Just Accepted Date: 10 July 2020   Online First Date: 11 August 2020    Issue Date: 06 December 2021
 Cite this article:   
Zhe XU,Yanyang ZHOU,Shuhuang CHEN, et al. Optical generation of UWB pulses utilizing Fano resonance modulation[J]. Front. Optoelectron., 2021, 14(4): 426-437.
 URL:  
https://academic.hep.com.cn/foe/EN/10.1007/s12200-020-1010-6
https://academic.hep.com.cn/foe/EN/Y2021/V14/I4/426
Fig.1  (a) Schematic structure of the micro-ring resonator-coupled Mach–Zehnder interferometer. Insets: structures of the phase shifter and the PN junction. (b) Microscope image of the fabricated device
Fig.2  Working principle illustration for generation of (a) and (b) UWB monocycle pulses in two polarities, (c) and (d) UWB doublet pulses in two polarities
Fig.3  Measured transmission spectrum of the RC-MZI in one Fano resonance evolution cycle. The insets illustrate the magnified resonance spectra at different wavelengths. The modeled spectra are also shown
Fig.4  Resonance spectra at four voltages (Vps) on the phase shifter
Fig.5  (a) Fano resonance spectral shifts with different voltages (Vd) applied to the PN junction. (b) Extracted waveguide effective refractive index variation as a function of voltage on the PN junction
Fig.6  Experimental setup for UWB signal generation and characterization. PC: polarization controller, EDFA: erbium-doped fiber amplifier, PD: photodetector, AMP: RF amplifier, AWG: arbitrary waveform generator, ESA: electrical spectrum analyzer
Fig.7  Generation of UWB monocycle pulses. (a) Monocycle pulses at the Fano resonance wavelength of 1548.93 nm and (b) its electrical spectrum. (c) Monocycle pulses at the Fano resonance wavelength of 1553.74 nm and (d) its electrical spectrum
Fig.8  Generation of UWB doublet pulses. (a) Doublet pulses at the Fano resonance wavelength of 1548.93 nm and (b) its electrical spectrum. (c) Doublet pulses at the Fano resonance wavelength of 1553.74 nm with the opposite polarity and (d) its electrical spectrum
Fig.9  Generation of high-order UWB pulses using a square-wave driving signal. (a) and (b) UWB doublet pulses and the electrical spectrum. (c) and (d) UWB triplet pulses and the electrical spectrum. (e) and (f) UWB quadruplet pulses and the electrical spectrum
electrical driving signal 200-MHz square wave 200-MHz Gaussian wave 100-MHz square wave
UWB signal UWB monocycle UWB monocycle UWB doublet UWB doublet UWB doublet UWB
triplet		 UWB quadruplet
optical wavelength/nm 1548.93 1553.74 1548.93 1553.74 1548.93 1548.93 1548.93
central frequency/GHz 1.2 0.8 0.8 1.2 1 1.1 1.3
10-dB bandwidth/GHz 2.2 1.4 3 1.4 1.2 0.8 1
fractional bandwidth/% 183 175 375 117 120 72.7 76.9
Tab.1  Extracted key performance specifications of the generated UWB pulses
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