Scanning performance characterization of narrow-linewidth tunable lasers via optical ring resonator

Abstract There are substantial demands for accessible and cost-effective characterization techniques for narrow-linewidth tunable lasers. In this paper, we present such a method leveraging the transmission properties of the optical ring resonator. Our approach enables the precise assessment of critical performances for narrow-linewidth tunable lasers, including startup and reset times, as well as scan range and speed, etc. Additionally, by measuring the beat note between the test laser and a reference laser, we can accurately determine the starting and ending wavelengths of the scanning range. Through the characterization of two narrow-linewidth tunable lasers and subsequent error analysis, we have validated the effectiveness of our proposed method and demonstrated that it is straightforward, convenient, and economical. This method will facilitate the comprehensive evaluation of narrow-linewidth tunable lasers and improve the effectiveness of their applications.