Na Byung Hoon, Ju Gun Wu, Choi Hee Ju, Cho Yong Chul, Park Yong Hwa, Park Chang Young, Lee Yong Tak
School of Information and Mechatronics, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju, South Korea.
Opt Express. 2012 Aug 13;20(17):19511-9. doi: 10.1364/OE.20.019511.
For reliable three dimensional (3D) imaging system, it is necessary for the optical shutter to have a wide spectral bandwidth operation and enhanced modulation depth. We propose an electro-absorption modulator (EAM) based on coupled Fabry-Perot cavities with micro-cavity (CCMC) which uses asymmetric tandem quantum wells (ATQWs) to obtain improved spectral bandwidth and enhanced modulation depth. Several modulator designs are investigated to obtain improved modulation performance such as wider spectral bandwidth and enhanced modulation depth. It was found that among all the studied modulator geometries, CCMC structure with ATQWs provides the widest spectral bandwidth of 9.6nm and high modulation depth in excess of 50% at -24V, which is good agreement with theoretical calculations. These results suggest that EAM has excellent potential as optical shutter for 3D imaging application.
对于可靠的三维（3D）成像系统，光学快门需要具备宽光谱带宽操作和增强的调制深度。我们提出了一种基于耦合法布里-珀罗微腔（CCMC）的电吸收调制器（EAM），它采用非对称串联量子阱（ATQW）来获得改善的光谱带宽和增强的调制深度。研究了几种调制器设计以获得诸如更宽光谱带宽和增强调制深度等更好的调制性能。结果发现，在所有研究的调制器几何结构中，带有ATQW的CCMC结构提供了9.6nm的最宽光谱带宽，并且在-24V时具有超过50%的高调制深度，这与理论计算结果吻合良好。这些结果表明，EAM作为用于3D成像应用的光学快门具有优异的潜力。
