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Optical unitary transformation of general nonoverlapping-image multimode interference couplers
Author(s): Zezheng Li; Yingxin Kuang; Zhiyong Li; Weihua Han
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Paper Abstract

An interpretation of optical unitary transformation is proposed for general non-overlapping-image multimode interference (MMI) couplers with any input and output ports based on the matrix mechanics. The light transformation in the MMI couplers can be considered as the optical field matrix acting on the input light column vector. We investigate the general phase principles of output light images. The complete proof of nonoverlapping-image MMI coupler’s optical unitarity is provided along with the phase analysis of matrix element. Based on a two-dimensional finite-difference time-domain simulation, the unitary transformation is obtained for a 4×4 non-overlapping-image MMI coupler within the deviation of 4×10-2 for orthogonal invariance among the C-band spectral range.

Paper Details

Date Published: 20 December 2019
PDF: 4 pages
Proc. SPIE 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 112090N (20 December 2019); doi: 10.1117/12.2542875
Show Author Affiliations
Zezheng Li, Univ. of Chinese Academy of Sciences (China)
Institute of Semiconductors, Chinese Academy of Sciences (China)
Yingxin Kuang, Univ. of Chinese Academy of Sciences (China)
Institute of Semiconductors, Chinese Academy of Sciences (China)
Zhiyong Li, Institute of Semiconductors, Chinese Academy of Sciences (China)
Weihua Han, Institute of Semiconductors, Chinese Academy of Sciences (China)


Published in SPIE Proceedings Vol. 11209:
Eleventh International Conference on Information Optics and Photonics (CIOP 2019)
Hannan Wang, Editor(s)

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