Design of a surface-illuminated-type semiconductor optical modulator with multi-quantum-well structures
✍ Scribed by Yuji Kuwamura; Yoshitake Nishiuma; Minoru Yamada
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 340 KB
- Volume
- 83
- Category
- Article
- ISSN
- 8756-663X
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✦ Synopsis
A surface-transmission-type semiconductor optical modulator using multi-quantum-well structures is designed. In order to realize a high extinction ratio and a low insertion loss with a lower driving voltage, a structure is proposed in which the voltage is applied in the transverse direction of the quantum well by means of comb-shaped conductive layers. The thickness of each layer is discussed. As an example of theoretical design with optimum conditions, a device structure realizing an extinction ratio between 10 and 20 dB and an insertion loss of 2 dB at a driving voltage of 5 V is presented. A high operating speed, up to several gigahertz, can be expected in a device with a surface area of 20 u 20