Optical unitary transformation of general nonoverlapping-image multimode interference couplers

Zezheng Li; Yingxin Kuang; Zhiyong Li; Weihua Han

doi:10.1117/12.2542875

20 December 2019 Optical unitary transformation of general nonoverlapping-image multimode interference couplers

Zezheng Li, Yingxin Kuang, Zhiyong Li, Weihua Han

Proceedings Volume 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019); 112090N (2019) https://doi.org/10.1117/12.2542875
Event: Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 2019, Xi'an, China

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.

Citation Download Citation

Zezheng Li, Yingxin Kuang, Zhiyong Li, and Weihua Han "Optical unitary transformation of general nonoverlapping-image multimode interference couplers", Proc. SPIE 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 112090N (20 December 2019); https://doi.org/10.1117/12.2542875

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