Abstract

In this Letter, we demonstrate a silicon four-quadrant photodetector working at the 1550-nm telecommunication wavelength and apply it to the measurements of the light-beam positions and deflection angles. Incident light changes the admittance of each quadrant photodetector through subbandgap optical absorption, and this change of admittance is read out through transimpedance amplification and lock-in readout circuitry. By monitoring the optical power received by the four quadrant photodetectors, we measure and track the position of the optical beam. Without any modification, the same device and associated circuit can also work at wavelengths shorter than the long-wavelength limit of silicon, for example, at 780 nm, as we demonstrate.

© 2022 Optica Publishing Group

Five-layer planar hot-electron photodetectors at telecommunication wavelength of 1550 nm

Weijia Shao, Junhui Hu, and Yongmei Wang
Opt. Express 30(14) 25555-25566 (2022)

Dispersive wave emission and supercontinuum generation in a silicon wire waveguide pumped around the 1550  nm telecommunication wavelength

François Leo, Simon-Pierre Gorza, Jassem Safioui, Pascal Kockaert, Stéphane Coen, Utsav Dave, Bart Kuyken, and Gunther Roelkens
Opt. Lett. 39(12) 3623-3626 (2014)

High-performance Ge-on-insulator lateral p-i-n waveguide photodetectors for electronic–photonic integrated circuits at telecommunication wavelengths

Tzu-Yang Huang, Radhika Bansal, Soumava Ghosh, Kwang Hong Lee, Qimiao Chen, Chuan Seng Tan, and Guo-En Chang
Opt. Lett. 49(5) 1281-1284 (2024)

Topological edge states of a long-range surface plasmon polariton at the telecommunication wavelength

Ran Gladstein Gladstone, Sukrith Dev, Jeffery Allen, Monica Allen, and Gennady Shvets
Opt. Lett. 47(17) 4532-4535 (2022)

Turbulence-resilient pilot-assisted self-coherent free-space optical communications using a photodetector array for bandwidth enhancement

Hao Song, Runzhou Zhang, Huibin Zhou, Xinzhou Su, Kaiheng Zou, Yuxiang Duan, Narek Karapetyan, Haoqian Song, Kai Pang, Nanzhe Hu, Amir Minoofar, Moshe Tur, and Alan E. Willner
Opt. Lett. 47(21) 5723-5726 (2022)