標題: Design of a photonic crystal tapered coupler with different section lengths based on multimode interference and mode matching
作者: Lu, Ming-Feng
Huang, Yang-Tung
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: coupling;mode matching;multimode interference;photonic crystal;tapered coupler
公開日期: 1-Mar-2008
摘要: 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.
URI: http://dx.doi.org/10.1143/JJAP.47.1822
http://hdl.handle.net/11536/9607
ISSN: 0021-4922
DOI: 10.1143/JJAP.47.1822
期刊: JAPANESE JOURNAL OF APPLIED PHYSICS
Volume: 47
Issue: 3
起始頁: 1822
結束頁: 1827
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