概要（Overview）

The Keysight 81689A is a compact tunable laser module tailored for the C-Band, making it an ideal tool for testing dense wavelength division multiplexing (DWDM) systems. With its capability for saturating optical amplifiers and configuring multi-channel test beds, this device is perfect for dense-WDM transmission testing. It offers continuous sweep through the full wavelength range, providing enhanced flexibility for DWDM passive component testing.