Deng Shengling, Huang Z Rena
Department of Electrical, Computer, and System Engineering, Rensselaer Polytechnic Institute, 110 8th St, Troy, New York 12180, USA.
Opt Express. 2011 Apr 11;19(8):7872-84. doi: 10.1364/OE.19.007872.
This paper proposes to use slow light effects near the Brillouin zone band edge of one-dimensional gratings for reducing the size of integrated electro-optic (EO) modulators. The gratings are built within the arms of a Mach-Zehnder Interferometer (MZI) for intensity modulation. To overcome the inherent high reflection and low extinction ratio, we introduce various multi-segment grating designs. We use coupled-mode theory and derive transfer matrices to analyze the spectral transmittance and phase delay of each arm of the interferometer. Calculations show that a size-reduction of a factor of 2 or more can be achieved at λ=1.574 µm with an insertion loss of 0.17 dB and an amplitude modulation extinction ratio of 18.84dB. The simulated structure is based on a Si slab-waveguide 0.2 μm thick with 30 nm deep grating groves on SiO(2)> substrate.
本文提出利用一维光栅在布里渊区带边附近的慢光效应来减小集成电光（EO）调制器的尺寸。这些光栅构建在马赫-曾德尔干涉仪（MZI）的臂内用于强度调制。为了克服固有的高反射和低消光比，我们引入了各种多段光栅设计。我们使用耦合模理论并推导传输矩阵来分析干涉仪各臂的光谱透射率和相位延迟。计算表明，在λ = 1.574 µm处，可实现2倍或更大倍数的尺寸减小，插入损耗为0.17 dB，幅度调制消光比为18.84 dB。模拟结构基于厚度为0.2 µm的硅平板波导，在SiO₂衬底上有30 nm深的光栅槽。
