GaAs Traveling-Wave Optical Modulators Using Modulated Coplanar Electrodes with Periodic Cross-Tie Overlays
Abstract
This technical report describes traveling-wave optical modulators using cross-tie slow-wave electrodes on GaAs substrates as well as wideband feeding of a coplanar strip electrode. Periodic cross-tie conductors are overlaid on a modulated coplanar strip and a modulated coplanar waveguide electrode to make slow-wave electrodes. In these structures, phase velocity matching between modulation and optical waves is satisfied over a very wide bandwidth by reducing the phase velocity of the modulation wave using the slow- wave electrodes. Therefore, the modulation bandwidths are greatly increased while the dominant conductor losses are relatively high and limit the bandwidths. The coplanar strip slow-wave structure has been build on a semi- insulating GaAs substrate and measured using a microwave network analyzer. The measured phase velocity is much lower than those of conventional coplanar electrodes and agrees very well with the calculated one. Keywords: Optical communications; Optical signal processing.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1989
- Accession Number
- ADA217731
Entities
People
- Hai-young Lee
- Tatsuo Itoh
Organizations
- University of Texas at Austin