Xiao Zhe, Luo Xianshu, Lim Peng Huei, Prabhathan Patinharekandy, Silalahi Samson T H, Liow Tsung-Yang, Zhang Jing, Luan Feng
1OPTIMUS, School of Electrical and Electronics Engineering, Nanyang Technological University, Singapore639798, Singapore.
Opt Express. 2013 Jul 15;21(14):16331-6. doi: 10.1364/OE.21.016331.
We observe that the cascaded typical Y junctions will introduce unwanted periodic fringes over the spectrum in practical systems when they link with multimode waveguides. To solve the problem, we design and experimentally demonstrate a wavelength insensitive multimode interferometer (MMI) based 3-dB splitter which has all the merits of Y-splitters such as polarization insensitivity and ultra-compactness. The splitter has a footprint of 1.5 × 1.8 µm(2), nearly one order smaller than the previously reported MMI splitters. The measured excess losses for TE and TM modes at telecom wavelength are as low as -0.11 dB and -0.18 dB respectively.
我们观察到，在实际系统中，当级联的典型Y型结与多模波导相连时，会在整个光谱上引入不需要的周期性条纹。为了解决这个问题，我们设计并通过实验证明了一种基于波长不敏感多模干涉仪（MMI）的3 dB分束器，它具有Y型分束器的所有优点，如偏振不敏感和超紧凑性。该分束器的占地面积为1.5×1.8 µm²，比先前报道的MMI分束器小近一个数量级。在电信波长下，TE和TM模式的测量额外损耗分别低至-0.11 dB和-0.18 dB。
