Silicon Photonic Optical Phased Array with Integrated Phase Monitors

Joint Special Section on Opto-electronics and Communications for Future Optical Network

Shun TAKAHASHI, Taichiro FUKUI, Ryota TANOMURA, Kento KOMATSU, Yoshitaka TAGUCHI, Yasuyuki OZEKI, Yoshiaki NAKANO, Takuo TANEMURA

Author information

Shun TAKAHASHI
Department of Electrical Engineering and Information Systems (EEIS), Graduate School of Engineering, The University of Tokyo
Taichiro FUKUI
Department of Electrical Engineering and Information Systems (EEIS), Graduate School of Engineering, The University of Tokyo
Ryota TANOMURA
Department of Electrical Engineering and Information Systems (EEIS), Graduate School of Engineering, The University of Tokyo
Kento KOMATSU
Department of Electrical Engineering and Information Systems (EEIS), Graduate School of Engineering, The University of Tokyo
Yoshitaka TAGUCHI
Department of Electrical Engineering and Information Systems (EEIS), Graduate School of Engineering, The University of Tokyo
Yasuyuki OZEKI
Department of Electrical Engineering and Information Systems (EEIS), Graduate School of Engineering, The University of Tokyo
Yoshiaki NAKANO
Department of Electrical Engineering and Information Systems (EEIS), Graduate School of Engineering, The University of Tokyo
Takuo TANEMURA
Department of Electrical Engineering and Information Systems (EEIS), Graduate School of Engineering, The University of Tokyo

Keywords: silicon photonics, optical phased arrays, optical phase monitoring

JOURNAL FREE ACCESS

2023 Volume E106.C Issue 11 Pages 748-756

DOI https://doi.org/10.1587/transele.2022OCP0003

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Abstract

The optical phased array (OPA) is an emerging non-mechanical device that enables high-speed beam steering by emitting precisely phase-controlled lightwaves from numerous optical antennas. In practice, however, it is challenging to drive all phase shifters on an OPA in a deterministic manner due to the inevitable fabrication-induced phase errors and crosstalk between the phase shifters. In this work, we fabricate a 16-element silicon photonic non-redundant OPA chip with integrated phase monitors and experimentally demonstrate accurate monitoring of the relative phases of light from each optical antenna. Under the beam steering condition, the optical phase retrieved from the on-chip phase monitors varies linearly with the steering angle, as theoretically expected.

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