Title :
Mode-discriminating electrooptic sampling for separating guided and unguided modes on coplanar waveguide
Author :
Baynes, N.de B. ; Allam, J. ; Cleaver, J.R.A.
Author_Institution :
Cavendish Lab., Cambridge Univ., UK
fDate :
3/1/1996 12:00:00 AM
Abstract :
Mode-discriminating electrooptic sampling (MEOS) of coplanar waveguides was shown to discriminate between the symmetric quasi-TEM guided mode and asymmetric field distributions including unguided electromagnetic radiation. Radiation generated in a photoconductive switch and reflected from the back of the substrate was unambiguously identified. Ultrafast sampling of devices showed features in the transmitted pulse due to multiple substrate reflections. These features are removed using MEOS, leading to increased accuracy in determination of S-parameters
Keywords :
S-parameters; coplanar waveguides; electro-optical effects; high-speed optical techniques; millimetre wave measurement; photoconducting switches; CPW; S-parameters determination; asymmetric field distributions; coplanar waveguide; guided modes; mode-discriminating electrooptic sampling; multiple substrate reflections; photoconductive switch; symmetric quasi-TEM mode; ultrafast sampling; unguided modes; Coplanar waveguides; Earth Observing System; Electromagnetic radiation; Electromagnetic waveguides; Laboratories; Photoconductivity; Pulse measurements; Sampling methods; Switches; Transmission line measurements;
Journal_Title :
Microwave and Guided Wave Letters, IEEE
