Design of a Photonic Crystal Tapered Coupler with Different Section Lengths Based on Multimode Interference and Mode Matching
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概要
- 論文の詳細を見る
Step tapered couplers, which act as mode converters, are usually used between photonic crystal (PC) waveguides and other optical devices for efficient coupling. In this study, the multimode interference (MMI) phenomena in multiple-line-defect PC waveguides are observed. It is found that the optimal length of each section in a PC step tapered coupler is related to the imaging length of MMI. Therefore, a PC step tapered coupler with different section lengths can be designed. Because the modes are matched between two adjacent sections and the scattering losses occurring at the corners of abrupt steps are reduced, it can provide an excellent transmission between PC waveguides and other optical devices. This study also reveals the reason why in some cases, the transmission of PC step tapered couplers decreases counterintuitively when the taper length is increased.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2008-03-25
著者
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Huang Yang-tung
Department Of Electrical Engineering National Sun Yat-sen University
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Lu Ming-Feng
Department of Electronics Engineering, Minghsin University of Science and Technology, No. 1, Hsin Hsin Rd., Hsinfeng, Hsinchu 304, Taiwan
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