Interdiffusion induced modification of surface-acoustic-wave AlGaAs-GaAs quantum-well modulators
| Autor: | Bernard L. Weiss, Wallace C. H. Choy |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Materials science
business.industry Interdigital transducer Surface acoustic wave Acoustic wave Atomic and Molecular Physics and Optics Amplitude modulation Wavelength Optics Modulation Optoelectronics Electrical and Electronic Engineering business Absorption (electromagnetic radiation) Quantum well |
| Zdroj: | IEEE Journal of Selected Topics in Quantum Electronics. 4:758-764 |
| ISSN: | 1077-260X |
| DOI: | 10.1109/2944.720489 |
| Popis: | A 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. |
| Databáze: | OpenAIRE |
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