Butterfly-like phase shift: a novel gauge for critical coupling of add–drop resonator

Journal of Theoretical and Applied Physics - Tập 12 - Trang 127-134 - 2018
Mahdi Bahadoran1, Preecha Yupapin2,3
1Department of Physics, Shiraz University of Technology, Shiraz, Iran
2Computational Optics Research Group, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam
3Faculty of Electrical & Electronics Engineering, Ton DucThang University, Ho Chi Minh City, Vietnam

Tóm tắt

Optical transfer function for add–drop resonator is derived in the presence of coupling loss using the scattering matrix method. A critical coupling condition for ADR is calculated. The response of the ADR under variation of coupling losses and coupling coefficients is studied. The number of allowed states under the critical condition is determined. The full width at half maximum as sharp as 0.17 nm is achieved. It is found that the relative phase shifts of through and drop ports show the same responses under the critical coupling condition. This response emerges in a butterfly-like phase shift, which can be considered as a new evaluating factor for checking the system in critical coupling condition.

Tài liệu tham khảo

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