1×5 optical splitter for TE modes in air-hole photonic crystal based on self-collimation effect

Weijuan Chen; Yuanyuan Lin; Guimin Lin; Ping Fu; Chengkun Liu; Yishen Qiu; Hui Li; Xiyao Chen

doi:10.1117/12.2245664

4 November 2016 1×5 optical splitter for TE modes in air-hole photonic crystal based on self-collimation effect

Weijuan Chen, Yuanyuan Lin, Guimin Lin, Ping Fu, Chengkun Liu, Yishen Qiu, Hui Li, Xiyao Chen

Proceedings Volume 10027, Nanophotonics and Micro/Nano Optics III; 100270L (2016) https://doi.org/10.1117/12.2245664
Event: SPIE/COS Photonics Asia, 2016, Beijing, China

Abstract

We propose a novel 1×5 optical splitter (OS) for TE modes based on self-collimation effect in an air-hole silicon photonic crystal. The OS consists of two cascaded resonators which is formed with eight beam splitters. The theoretical transmission spectra of the OS is derived with multiple-beam interference theory. From our analysis of transmission spectra, it is found that the transmission spectra at five drop ports will reach the maximum values while the transmission spectra at two through ports reach zero for resonant frequencies. By scanning the radius of a beam splitter, the relationship between the radius and the reflectivity is obtained. Therefore, by changing the radii of the air-hole in eight beam splitters, we can manipulate the output light-intensity ratio at five drop ports to meet requirement. Theoretically, when reflectivity of beam splitters R₁=2/11, R₂=8/11, R₃=5/8, R₄=2/5, R₅=7/12, R₆=6/7, R₇=1/2, R₈ =2/3, the light intensity ratio at five drop ports is 1:1:1:1:1. When R₁=2/7, R₂=6/7, R₃=1/2, R₄=2/3, R₅=1/7, R₆=6/7, R₇=2/3, R₈ =1/4, the light intensity ratio at five drop ports is 2:2:1:2:3. By means of finite-difference time-domain (FDTD) simulations, the numerical transmission spectra of OS can be figured out. The simulation results are consistent with the theoretical results. Considering micro processing technology of silicon materials is already available, this OS can be used in the photonic integrated circuits because of its small size, whole-silicon material and low insertion loss.

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Weijuan Chen, Yuanyuan Lin, Guimin Lin, Ping Fu, Chengkun Liu, Yishen Qiu, Hui Li, and Xiyao Chen "1×5 optical splitter for TE modes in air-hole photonic crystal based on self-collimation effect", Proc. SPIE 10027, Nanophotonics and Micro/Nano Optics III, 100270L (4 November 2016); https://doi.org/10.1117/12.2245664

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KEYWORDS

Photonic crystals

Beam splitters

Finite-difference time-domain method

Reflectivity

Resonators

Silicon photonics

Crystals

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