부산대학교 도서관

This paper present the conditions for ultrashort pulse (USP) decomposition in multicascade structures based on a meander line turn with an asymmetric cross-section. First, a detailed analysis of a meander line turn with a broad-side coupling is presented, in which the even mode pulse propagates faster than the odd one. Then the conditions for an arbitrary number of cascades (N) are obtained, and their verification is performed. The possibility of USP attenuation is shown: up to 9.3 times in the structure with N=2, up to 21.11 times in the structure with N=3, up to 84.9 times in the structure with N=4, up to 213.9 times in the structure with N=5. It was revealed that that successive increase of N from turns with the same cross-section parameters to ensure conditions for USP decomposition requires an increase in the length of the first cascade by 8 times relative to the length of the previous cascade. In practice, a situation is possible when the propagation velocity for the odd mode is higher than that for the even mode. Therefore, we summarize conditions for an arbitrary case of a cross-section.