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http://dx.doi.org/10.7236/JIIBC.2019.19.5.175

Optical Characteristics of Blazed Grating-Assisted Directional Coupler  

Ho, Kwang-Chun (Dept. of EI Engineering, Hansung University)
Publication Information
The Journal of the Institute of Internet, Broadcasting and Communication / v.19, no.5, 2019 , pp. 175-180 More about this Journal
Abstract
The optical characteristics and power transfers between guiding channels of blazed grating-assisted directional coupler (B-GADC) are evaluated in detail by using novel and rigorous modal transmission-line theory (MTLT) based on eigenvalue problem. To evaluate the coupling efficiency of B-GADC, the dispersion curves as a function of the grating period and wavelength are analyzed numerically for quasi-TE and quasi-TM modes. Furthermore, symmetric, sawtooth and asymmetric grating profiles are considered to know the effect of blazing characteristics on power transfer of GADC. The numerical results show that the grating period for minimum-gap condition to obtain maximum power transfer decreases gradually as the blazed structure changes from symmetric to asymmetric profile. On the other hand, the coupling length increases reversely.
Keywords
Optical Directional Coupler; Blazed Grating; Coupling Efficiency; Coupling Length;
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Times Cited By KSCI : 3  (Citation Analysis)
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1 D. Xu , and M. Vachon, "Label-free biosensor array based on silicon-on-insulator ring resonators addressed using a WDM approach," Opt. Lett., Vol. 35, pp. 2771-2773, 2010. DOI: https://doi.org/10.1364/OL.35.002771   DOI
2 S. Hsu, "Signal power tapped with low polarization dependence and insensitive wavelength on silicon-on-insulator platforms," J. Opt. Soc. Am. B, Vol. 27, pp. 941-047, 2010. DOI: https://doi.org/10.1364/JOSAB.27.000941   DOI
3 Q. Deng, H. Yi, Q. Long, X. Wang, and Z. Zhou, "Low loss silicon microring resonator as comb filter," Opt. Commun., Vol. 355, pp. 285-289, 2015.   DOI
4 Y. Shoji, K. Kintaka, S. Suda, H. Kawashima, T. Hasama, and H. Ishikawa, "Low-crosstalk $2{\times}2$ thermo-optic switch with silicon wire waveguides," Opt. Express, Vol. 18, pp. 9071-9075, 2010.   DOI
5 G. W. Cong, K. Suzuki, S. H. Kim, K. Tanizawa, S. Namiki, and H. Kawashima, "Demonstration of a 3-dB directional coupler with enhanced robustness to gap variations for silicon wire waveguides," Opt. Express, Vol. 22, pp. 2051-2059, 2014. DOI: https://doi.org/10.1364/OE.22.002051   DOI
6 K. C. Ho, and K. Ho, "Longitudinal Modal Transmission-Line Theory (L-MTLT) of Multilayered Periodic Waveguides," IEICE Trans. Electronics, Vol. E88-C, No. 2, pp. 270-274, 2005. DOI: https://doi.org/10.1093/ietele/E88-C.2.270   DOI
7 K. C. Ho, "Rigorous Analysis of Periodic Blazed 2D Diffraction Grating using Eigenvalue Problem of Modal Transmission-Line Theory," The J. of IIBC, Vol. 19, No. 3, pp. 173-178, 2019. DOI: https://doi.org/10.7236/JIIBC.2019.19.3.173   DOI
8 K. C. Ho, "Coupling Efficiency of Asymmetric Grating-Assisted Directional Coupler," The J. of IIBC, Vol. 17, No. 4, pp. 187-192, 2017. DOI: https://doi.org/10.7236/JIIBC.2017.17.4.187   DOI
9 Jun-Seok Oh, Dal Ahn, "A Design of 3dB Coupler with Multi Layer Structure Using Arbitrary Termination Impedance for High Power Amplifier," Journal of KIIT. Vol. 15, pp. 51-57, 2017.   DOI