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

Volume

6

Issue

3

fYear

1996

fDate

3/1/1996 12:00:00 AM

Firstpage

126

Lastpage

128

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;

fLanguage

English

Journal_Title

Microwave and Guided Wave Letters, IEEE

Publisher

ieee

ISSN

1051-8207

Type

jour

DOI

10.1109/75.481088

Filename

481088