Global calibration of large-scale photonic integrated circuits

• URL: http://arxiv.org/abs/2407.02207v3
• Date: Wed, 06 Nov 2024 02:56:48 GMT
• Title: Global calibration of large-scale photonic integrated circuits
• Authors: Jin-Hao Zheng, Qin-Qin Wang, Lan-Tian Feng, Yu-Yang Ding, Xiao-Ye Xu, Xi-Feng Ren, Chuan-Feng Li, Guang-Can Guo,
• Abstract summary: We propose a global calibration approach for large-scale photonic integrated circuit (PIC) Our method utilizes a custom network to simultaneously learn the nonlinear phase-current relations for all thermo-optic phase shifters on the PIC. Results will greatly benefit the applications of large-scale PICs in photonic quantum information processing.
• Score: 0.6883165603899954
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• Abstract: The growing maturity of photonic integrated circuit (PIC) fabrication technology enables the high integration of an increasing number of optical components onto a single chip. With the incremental circuit complexity, the calibration of active phase shifters in a large-scale PIC becomes a crucially important issue. The traditional one-by-one calibration techniques encounter significant hurdles with the propagation of calibration errors, and achieving the decoupling of all phase shifters for independent calibration is not straightforward. To address this issue, we propose a global calibration approach for large-scale PIC. Our method utilizes a custom network to simultaneously learn the nonlinear phase-current relations for all thermo-optic phase shifters on the PIC by minimizing the negative likelihood of the measurement datasets. Moreover, the reflectivities of all static beam splitter components can also be synchronizedly extracted using this calibration method. As an example, a quantum walk PIC with a circuit depth of 12 is calibrated, and a programmable discrete-time quantum walk is experimentally demonstrated. These results will greatly benefit the applications of large-scale PICs in photonic quantum information processing.

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