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Proceedings Paper

Novel single-mode asymmetric y-branches for 3-dB power divider
Author(s): June-Hung Lien; Han-Bin Lin; Wen-Ching Chang; Pei-Shan Tsai
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Paper Abstract

A wide-angle single-mode 3-dB asymmetric Y-junction with a microprism is proposed. Symmetric Y-branches, useful for equal power splitting, have been widely investigated by various authors. Asymmetric Y-branches, however, are not as well studied as their symmetric counterparts. In this paper, the phase front mismatch caused by asymmetric branching will be discussed. The microprism is designed by its phase compensation rule (PCR), the phase front mismatch at the branching point is greatly eliminated, and the structure of the microprism can be varied in fixed microprism length or fixed index. By utilizing the PCR we proposed, each branch arm will have equal power. A conventional asymmetric Y-branch can be utilized as a 3-dB divider only under small and specific branching angles. To remove this disadvantage, a novel asymmetric Y-branch with microprism is proposed. This structure can divide the optical power almost equally into output branches under large-angle. Because the difference between the index of the film and the index of the substrate is very small, the proposed structure is weakly guiding. Therefore, device performance examined numerically by the semivectorial finite difference beam propagation method (SVFD- BPM) should be acceptable and always kept at satisfactory levels in this paper.

Paper Details

Date Published: 3 October 2000
PDF: 6 pages
Proc. SPIE 4220, Advanced Photonic Sensors: Technology and Applications, (3 October 2000); doi: 10.1117/12.401679
Show Author Affiliations
June-Hung Lien, Tamkang Univ. (Taiwan)
Han-Bin Lin, China Institute of Technology and Commerce (Taiwan)
Wen-Ching Chang, Tamkang Univ. (Taiwan)
Pei-Shan Tsai, Tamkang Univ. (Taiwan)

Published in SPIE Proceedings Vol. 4220:
Advanced Photonic Sensors: Technology and Applications
Jinfa Tang; Chao-Nan Xu; Haizhang Li, Editor(s)

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