激光与光电子学进展, 2019, 56 (9): 091302, 网络出版: 2019-07-05
光子晶体八通道波分复用器研究 下载: 1077次
Eight-Channel Photonic-Crystal Wavelength-Division Multiplexer
集成光学 光子晶体环形谐振腔 耦合谐振 波分复用器 时域有限差分法 integrated optics photonic crystal ring resonator resonant coupling wavelength-division multiplexer finite difference time domain method
摘要
基于光子晶体谐振腔优越的选频特性,设计了一种八波长光子晶体波分复用器。利用平面波展开法得到了特定晶格排列和半径下光子晶体的能带结构,采用时域有限差分法分析了微腔耦合频率的变化规律,得出环形谐振器和微腔之间的共振耦合特性。该器件主要由4个光子晶体环形腔和8个尺寸不同的微腔组成,实现了1.37,1.39,1.42,1.44,1.50,1.51,1.53,1.55 μm等8个波长的波分解复用。结果表明,只通过调节微腔中心柱和外围介质柱的半径,就可以使8个波长从特定端口输出,且输出效率都可以达到97%以上。所设计的器件尺寸为23 μm×18 μm,具有物理尺寸小、耦合效率高等优点,在集成光学领域具有潜在的应用前景。
Abstract
Herein, an eight-wavelength photonic-crystal wavelength demultiplexer was designed based on the superior frequency-selection characteristics of a photonic crystal resonator. The energy band structure of the photonic-crystal with a specific lattice constant and radius was obtained using the plane wave expansion method. The law of variation in the coupling frequency of a micro-cavity was analyzed via the finite difference time domain method. The resonant coupling between the ring resonator and the micro-cavity was demonstrated. The device primarily comprised four photonic-crystal ring resonators and eight micro-cavities with different sizes. It achieved wavelength-division multiplexing at eight wavelengths of 1.37, 1.39, 1.42, 1.44, 1.50, 1.51, 1.53, and 1.55 μm. The results show that the aforementioned eight wavelengths can be output from a specific port, and an output efficiency of more than 97% can be achieved by adjusting the radii of the central rods of the micro-cavity and the peripheral dielectric rods. The designed device can be applied in integrated optics owing to its small physical size of 23 μm×18 μm and high coupling efficiency.
吴蓉, 刘振, 严清博, 吴小所. 光子晶体八通道波分复用器研究[J]. 激光与光电子学进展, 2019, 56(9): 091302. Rong Wu, Zhen Liu, Qingbo Yan, Xiaosuo Wu. Eight-Channel Photonic-Crystal Wavelength-Division Multiplexer[J]. Laser & Optoelectronics Progress, 2019, 56(9): 091302.