Mach-Zehnder modulator based on photonic crystal and nanowire waveguide
Received:December 23, 2018  Revised:May 28, 2019  download
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Author NameAffiliationE-mail
HU Yu-Chen College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China hundeduwu@126.com 
CHEN He-Ming Bell Honors School, Nanjing University of Posts and Telecommunications, Nanjing 210023, China chhm@njupt.edu.cn 
ZHOU Hao-Tian College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China  
Abstract:A Mach-Zehnder modulator based on photonic crystal and nanowire waveguide is proposed. The modulator consists of silicon-based photonic crystal slab waveguides, nanowire waveguides, and two photonic crystal multimode interference couplers (MMI). Designed tapered structures are working at the junction of the photonic crystal and the nanowire waveguide to reduce the loss caused by the mode mismatch. The simulation analysis by time-domain finite difference method (3D-FDTD) shows that the insertion loss and extinction ratio of the modulator with a compact size of only 46μm × 8μm × 0.22μm at the operating wavelength of 1550 nm are 0.3dB,15.1dB,respectively. The operation with a wavelength range of 20 nm are obtained at a center wavelength of 1551 nm.The 3dB bandwidth can reach 68 GHz,which allows high speed optical communication systems.
keywords:photonic crystal  modulator  multimode interference coupling  Mach-Zehnder type
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Copyright:《Journal of Infrared And Millimeter Waves》