Low voltage operation of electro-absorption modulator promising for high-definition 3D imaging application using a three step asymmetric coupled quantum well structure

3rd International Conference on Mathematical Modeling in Physical Sciences

物理学;数学

Na, Byung Hoon^1 ; Ju, Gun Wu^1 ; Choi, Hee Ju^2 ; Lee, Soo Kyung^3 ; Jeon, Jin Myeong^2 ; Cho, Yong Chul^1 ; Park, Yong Hwa^4 ; Park, Chang Young^4 ; Lee, Yong Tak^1,2,3

School of Information and Informations, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju

500-712, Korea, Republic of^1

Department of Physics and Photon Science, GIST, Korea, Republic of^2

Department of Nanobio Materials and Electronics, GIST, Korea, Republic of^3

Advanced Device Lab, Samsung Advanced Institute of Technology, Giheung, Yongin

446-712, Korea, Republic of^4

关键词: Absorption changes;    Asymmetric coupled quantum wells;    Electro absorption modulator(EAM);    Low operating voltage;    Low voltage operation;    Rectangular quantum wells;    Theoretical calculations;    Three dimensional (3-D) imaging;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/574/1/012171/pdf
DOI  :  10.1088/1742-6596/574/1/012171

来源: IOP

【 摘 要 】

In this paper, we propose a transmission type electro-absorption modulator (EAM) operating at 850 nm having low operating voltage and high absorption change with low insertion loss using a novel three step asymmetric coupled quantum well (3 ACQW) structure which can be used as an optical image shutter for high-definition (HD) three dimensional (3D) imaging. Theoretical calculations show that the exciton red shift of 3 ACQW structure is more than two times larger than that of rectangular quantum well (RQW) structure while maintaining high absorption change. The EAM having coupled cavities with 3 ACQW structure shows a wide spectral bandwidth and high amplitude modulation at a bias voltage of only -8V, which is 41% lower in operating voltage than that of RQW, making the proposed EAM highly attractive as an optical image shutter for HD 3D imaging applications.