Inverse design of a low-loss, compact equal-input 3 × 1 MMI power coupler

Hongbao Liu; Yingxuan Zhao; Rui Huang; Xiaojuan She; Yang Li; Han Liao; Junbo Zhu; Zijian Zhu; Xiang Liu; Zhen Sheng; Fuwan Gan

doi:10.1117/12.2674794

2 May 2023 Inverse design of a low-loss, compact equal-input 3 × 1 MMI power coupler

Hongbao Liu, Yingxuan Zhao, Rui Huang, Xiaojuan She, Yang Li, Han Liao, Junbo Zhu, Zijian Zhu, Xiang Liu, Zhen Sheng, Fuwan Gan

Author Affiliations +

Proceedings Volume 12642, Second International Conference on Electronic Information Engineering, Big Data, and Computer Technology (EIBDCT 2023); 1264209 (2023) https://doi.org/10.1117/12.2674794
Event: Second International Conference on Electronic Information Engineering, Big Data and Computer Technology (EIBDCT 2023), 2023, Xishuangbanna, China

Abstract

As a widely studied fundamental block in photonic integrated circuits, multimode interferometer (MMI) is excellent in coupling of multiple light sources with equal intensity. However, unacceptable excess loss occurs if phase-matching is not satisfied at any input port. In this paper, we proceed direct binary search (DBS) algorithm to optimize an inverse designed 3 × 1 MMI coupler with nano-pixel structure and realize high-efficiency coupling of equal input (intensity and phase) sources of 1550 nm fundamental TE mode, with a compact footprint of 2.5 × 2.5 μm² and low excess loss of 0.04dB. We also investigated the possibility of inverse design method to handle the coupling of multiple input sources with arbitrary phase difference among different ports.

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Hongbao Liu, Yingxuan Zhao, Rui Huang, Xiaojuan She, Yang Li, Han Liao, Junbo Zhu, Zijian Zhu, Xiang Liu, Zhen Sheng, and Fuwan Gan "Inverse design of a low-loss, compact equal-input 3 × 1 MMI power coupler", Proc. SPIE 12642, Second International Conference on Electronic Information Engineering, Big Data, and Computer Technology (EIBDCT 2023), 1264209 (2 May 2023); https://doi.org/10.1117/12.2674794

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KEYWORDS

Design and modelling

Transmittance

Finite-difference time-domain method

Optical path differences

Waveguides

Mathematical optimization

Photonic integrated circuits

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