中国物理B ›› 2018, Vol. 27 ›› Issue (2): 27801-027801.doi: 10.1088/1674-1056/27/2/027801

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Optimizing effective phase modulation in coupled double quantum well Mach-Zehnder modulators

Guang-Hui Wang(王光辉), Jin-Ke Zhang(张金珂)   

  1. 1. Guangzhou Key Laboratory for Special Fiber Photonic Devices South China Normal University, Guangzhou 510006, China;
    2. Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, South China Normal University, Guangzhou 510006, China
  • 收稿日期:2017-07-13 修回日期:2017-10-16 出版日期:2018-02-05 发布日期:2018-02-05
  • 通讯作者: Guang-Hui Wang E-mail:wanggh@scnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11474106), the Natural Science Foundation of Guangdong Province, China (Grant No. 2016A030313439), and the Science and Technology Program of Guangzhou City, China (Grant No. 201707010403).

Optimizing effective phase modulation in coupled double quantum well Mach-Zehnder modulators

Guang-Hui Wang(王光辉)1,2, Jin-Ke Zhang(张金珂)1,2   

  1. 1. Guangzhou Key Laboratory for Special Fiber Photonic Devices South China Normal University, Guangzhou 510006, China;
    2. Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, South China Normal University, Guangzhou 510006, China
  • Received:2017-07-13 Revised:2017-10-16 Online:2018-02-05 Published:2018-02-05
  • Contact: Guang-Hui Wang E-mail:wanggh@scnu.edu.cn
  • About author:78.20.Jq; 73.21.Fg; 42.65.-k
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11474106), the Natural Science Foundation of Guangdong Province, China (Grant No. 2016A030313439), and the Science and Technology Program of Guangzhou City, China (Grant No. 201707010403).

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摘要： We report optimal phase modulation based on enhanced electro-optic effects in a Mach-Zehnder (MZ) modulator constructed by AlGaAs/GaAs coupled double quantum well (CDQW) waveguides with optical gain. The net change of refractive indexes between two arms of the CDQW MZ modulator is derived by both the electronic polarization method and the normal-surface method. The numerical results show that very large refractive index change over 10-1 can be obtained, making the phase modulation in the CDQW MZ modulator very highly efficient. It is desirable and important that a very small voltage-length product for π phase shift, Vπ×L0=0.0226 V·mm, is obtained by optimizing bias electric field and CDQW structural parameters, which is about seven times smaller than that in single quantum-well MZ modulators. These properties open an avenue for CDQW nanostructures in device applications such as electro-optical switches and phase modulators.

关键词: electro-optic effect, phase modulator, quantum well

Abstract: We report optimal phase modulation based on enhanced electro-optic effects in a Mach-Zehnder (MZ) modulator constructed by AlGaAs/GaAs coupled double quantum well (CDQW) waveguides with optical gain. The net change of refractive indexes between two arms of the CDQW MZ modulator is derived by both the electronic polarization method and the normal-surface method. The numerical results show that very large refractive index change over 10-1 can be obtained, making the phase modulation in the CDQW MZ modulator very highly efficient. It is desirable and important that a very small voltage-length product for π phase shift, Vπ×L0=0.0226 V·mm, is obtained by optimizing bias electric field and CDQW structural parameters, which is about seven times smaller than that in single quantum-well MZ modulators. These properties open an avenue for CDQW nanostructures in device applications such as electro-optical switches and phase modulators.

Key words: electro-optic effect, phase modulator, quantum well

中图分类号:  (Electro-optical effects)

  • 78.20.Jq
73.21.Fg (Quantum wells) 42.65.-k (Nonlinear optics)