Asymmetric double-quantum-well phase modulator using surface acoustic waves
Asymmetric double-quantum-well phase modulator using surface acoustic waves
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DOI：
10.1109/3.720217
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发表时间：
1998-10
影响因子：
2.5
通讯作者：
W. Choy;E. Li;B. Weiss
中科院分区：
文献类型：
--
作者：
W. Choy;E. Li;B. Weiss
对利用声表面波实现的AlGaAs-GaAs非对称双量子阱光相位调制器进行了理论研究。在此讨论了DQW结构的优化步骤，这是迄今为止还没有详细报道的。优化后的相位调制器结构包含一个五周期的QDW有源区。表面声波感应提供相位调制的势场。调制特性的分析表明，通过使用非对称DQW，在表面处的感生电势的大的变化，从而大的修改的量子阱（QW）结构可以被利用。每个QW结构的修改是一致的，尽管在典型的表面声波器件中并不总是保持这种一致性。因此，五个DQW中的每一个中的折射率的变化几乎相同。此外，与具有五个周期的单量子阱作为有源区的调制器相比，这里的有效折射率的变化大十倍，从而产生更大的相位调制。此外，这里所需的长波长和低声表面波功率简化了声表面波换能器和声光相位调制器的制造。
An AlGaAs-GaAs asymmetric double-quantum-well (DQW) optical phase modulator using surface acoustic waves is investigated theoretically. The optimization steps of the DQW structure, which so far have not been reported in detail, are discussed here. The optimized phase modulator structure is found to contain a five-period QDW active region. A surface acoustic wave induces a potential field which provides the phase modulation. Analysis of the modulation characteristics show that by using the asymmetric DQW, the large change of the induced potential at the surface and thus large modification of the quantum-well (QW) structure can be utilized. The modification of each QW structure is consistent, although this consistency is not always preserved in typical surface acoustic wave devices. Consequently, the change of refractive index in each of the five DQW's is almost identical. Besides, the change of effective refractive index is ten times larger here in comparison to a modulator with a five-period single QW as the active region and thus produces a larger phase modulation. In addition, a long wavelength and a low surface acoustic wave power required here simplify the fabrication of surface acoustic wave transducer and the acoustooptic phase modulator.