概要（Overview）

The Keysight 81654A Fabry-Perot laser source is a high-performance dual-wavelength module operating at 1310/1550nm with an output power of 1mW. It boasts impressive CW power stability of ±0.03db over 24 hours and features internal digital modulation. Designed for use with optical power meter modules, it facilitates accurate insertion loss, optical return loss, and PDL measurement of broadband components and fibers. Its design ensures insensitivity to back reflections and provides stability for both short and long-term measurement applications.