Real‐Time Measurements of Photonic Microchips with Femtometer‐Scale Spectral Precision and Ultrahigh Sensitivity

Author:

Dashtabi Mahdi Mozdoor1,Khoshmehr Mohammad Talebi1,Nikbakht Hamed1,Rodriguez Bruno Lopez2,Sharma Naresh2,Zadeh Iman Esmaeil2,Akca B. Imran1

Affiliation:

1. LaserLab, Department of Physics and Astronomy VU University De Boelelaan 1081 Amsterdam 1081 HV The Netherlands

2. Department of Imaging Physics (ImPhys) Faculty of Applied Sciences Delft University of Technology 2628 CJ Delft The Netherlands

Abstract

AbstractPhotonic integrated circuits (PICs) are enabling breakthroughs in several areas, including quantum computing, neuromorphic processors, wearable devices, and more. Nevertheless, existing PIC measurement methods lack the spectral precision, speed, and sensitivity required for refining current applications and exploring new frontiers such as point‐of‐care or wearable biosensors. Here, the “sweeping optical frequency mixing method (SOHO)” is presented, surpassing traditional PIC measurement methods with real‐time operation, 30 dB higher sensitivity, and over 100 times better spectral resolution. Leveraging the frequency mixing process with a sweeping laser, SOHO excels in simplicity, eliminating the need for advanced optical components and additional calibration procedures. Its superior performance is demonstrated on ultrahigh‐quality factor (Q) fiber‐loop resonators (Q = 46 × 106), as well as microresonators, realized on a new optical waveguide platform. An experimental spectral resolution of 19.1 femtometers is demonstrated using an 85‐meter‐long unbalanced fiber Mach Zehnder Interferometer, constrained by noise resulting from the extended fiber length, while the theoretical resolution is calculated to be 6.2 femtometers, limited by the linewidth of the reference laser. With its excellent performance metrics, SOHO has the potential to become a vital measurement tool in photonics, excelling in high‐speed and high‐resolution measurements of weak optical signals.

Publisher

Wiley

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