Title :
Fullwave analysis of picosecond photoconductive switches
Author :
Sano, Eiichi ; Shibata, Tsugumichi
Author_Institution :
NTT LSI Lab., Atsugi, Japan
fDate :
2/1/1990 12:00:00 AM
Abstract :
A fullwave analysis method for characterizing fast photoconductive switches (PCs) is proposed. Three-dimensional Maxwell curl equations, including the conductive current components, are solved using a finite-difference time-domain scheme. It is found from simulations that PCs in coupled microstrip lines with small widths and spacings are very effective in avoiding propagation of non-quasi-TEM modes and for achieving rapid responses. Futhermore, responses for PCs with pulse-forming networks constructed of coplanar waveguide shunt electrodes are simulated. Ultrashort electrical pulses with minimum widths of 0.2 and 0.4 ps can be obtained by symmetric and antisymmetric excitation methods, respectively, for linewidth and spacing readily realized
Keywords :
electrodes; high-speed optical techniques; optical switches; optical waveguides; photoconducting devices; semiconductor switches; 0.2 ps; 0.4 ps; 3D Maxwell curl equations; antisymmetric excitation methods; conductive current components; coplanar waveguide shunt electrodes; coupled microstrip lines; fast photoconductive switches; finite-difference time-domain scheme; fullwave analysis method; picosecond photoconductive switches; pulse-forming networks; rapid responses; symmetric excitation methods; ultrashort electrical pulses; Coplanar waveguides; Electrodes; Finite difference methods; Maxwell equations; Microstrip; Personal communication networks; Photoconductivity; Space vector pulse width modulation; Switches; Time domain analysis;
Journal_Title :
Quantum Electronics, IEEE Journal of
