Structural Optimization of Silica-Based 2 X 2 Multimode Interference Coupler Using a Real-Coded Micro-Genetic Algorithm
Structural Optimization of Silica-Based 2 X 2 Multimode Interference Coupler Using a Real-Coded Micro-Genetic Algorithm
复制标题
使用实数编码微遗传算法优化硅基 2 X 2 多模干扰耦合器的结构
DOI：
10.2528/pierm17012204
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发表时间：
2017
影响因子：
1
通讯作者：
K. Hirayama
中科院分区：
文献类型：
--
作者：
T. Yasui;J. Sugisaka;K. Hirayama
我们提出了一种基于实际编码的微基因算法的结构优化方法，以实现弱引导的2×2多模具干扰（MMI）耦合器，其在1520至1580 nm的波长中，不平衡和多余的损失。应用于基于二氧化硅的2×2 MMI耦合器，相对折射率差为5.5％。损失小于0.14 dB，在操作波长范围内的归一化输出功率超过48％。那些通过4×4和1×4 mmi耦合器的常规方法，被证明比常规方法更有效。其结构参数的值接近典型制造公差精度内的优化值。
We propose a structural optimization method based on a real-coded micro-genetic algorithm to realize a weakly guided 2 × 2 multimode interference (MMI) coupler with low imbalance and excess loss over a wavelength range from 1520 to 1580 nm. The proposed method was applied to silica-based 2× 2 MMI couplers with a relative refractive index difference of 5.5%. The optimized result showed an imbalance of less than 8.4×10−3 dB, an excess loss of less than 0.14 dB, and a normalized output power of more than 48% over the operation wavelength range. The proposed method achieved an optimized 2 × 2 MMI coupler after 250 times of propagation analysis per wavelength, which is less than 6.7% of those by the conventional methods for 4×4 and 1×4 MMI couplers, and was proven to be more effective than the conventional methods. To consider realistic optical devices, 2 × 2 MMI couplers whose values of structural parameters are close to the optimized values within the accuracy of typical fabrication tolerance are also analyzed. The results are comparable to those of the optimized 2 × 2 MMI coupler.