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Polarization-insensitive electroabsorption by use of quantum well interdiffusion

机译:量子阱互扩散对极化不敏感的电吸收

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摘要

A paraboliclike quantum well structure can be used to produce polarization-insensitive waveguide type modulators. We propose the use of interdiffusion of A1GaAs/GaAs quantum wells to achieve the parabolic well shape. Criteria to achieve the paraboliclike quantum wells by interdiffusion are discussed. The theoretical results indicate that interdiffused quantum wells can produce equal eigenstate spacing, polarization insensitive Stark shifts, and modulation similar to an ideal parabolic quantum well. Three procedures are also proposed to develop polarization-insensitive on and off states in paraboliclike inter- diffused quantum wells. The modulation depth is compatible with that of the measured parabolic quantum wells. For diffused quantum wells one can take advantage of using an as-grown rectangular quantum well with postgrowth thermal processing. These features demonstrate that an interdiffused quantum well structure can be used to produce a polarization-insensitive electroabsorptive modulator. # 1998 Optical Society of America OCIS codes: 230.5440, 260.6580, 270.0270.
机译:抛物线型量子阱结构可用于产生对偏振不敏感的波导型调制器。我们建议使用AlGaAs / GaAs量子阱的相互扩散来实现抛物线形。讨论了通过互扩散获得抛物线形量子阱的标准。理论结果表明,相互扩散的量子阱可以产生与理想抛物线量子阱相似的本征态间距,极化不敏感的斯塔克位移和调制。还提出了三种程序来在抛物线形互扩散量子阱中产生对偏振不敏感的开和关状态。调制深度与测得的抛物线量子阱的调制深度兼容。对于扩散量子阱,可以利用在生长后热处理中使用已生长的矩形量子阱的优势。这些特征表明,相互扩散的量子阱结构可用于产生对偏振不敏感的电吸收调制器。 #1998美国光学学会OCIS编码:230.5440、260.6580、270.0270。

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