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Interdiffusion induced modification of surface-acoustic-wave AlGaAs-GaAs quantum-well modulators
journal contribution
posted on 2023-06-08, 07:40 authored by W C H Choy, B L WeissA theoretical study of short period AlGaAs-GaAs diffused quantum-well (QW) absorption modulators operated by using surface acoustic waves (SAWs) is carried out in this paper. The as-grown QW structure is optimized and interdiffusion is used to fine tune the modulation performance. The results show that a stack of QWs can be developed at the top surface of the modulator to utilize the steep potential induced by SAWs. The optimized structure can also produce a large absorption change and thus a fast modulation speed for the same modulation depth. In comparison to previous results, the required surface acoustic wave has a longer wavelength and a lower power so that the fabrication of the interdigital transducer can be simplified. In addition, the use of interdiffusion can provide an useful fine adjustment to the operating wavelength, further enhancement of the modulation depth and an improvement in chirping with the only drawback of an increased absorption loss.
History
Publication status
- Published
Journal
IEEE Journal of Selected Topics in Quantum ElectronicsISSN
1077-260XPublisher
Institute of Electrical and Electronics EngineersExternal DOI
Issue
4Volume
4Page range
758-764Department affiliated with
- Engineering and Design Publications
Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06Usage metrics
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