For example: Agilent E4440A or Anritsu 68369
Compact Tunable Laser Source, 1465nm to 1575nm
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Keysight / Agilent 81989A Overview
Keysight's 819xxA high-power compact tunable lasers enable optical device characterization at high power levels and measurement of nonlinear effects. They improve the testing of all types of optical amplifiers and other active components, as well as broadband passive optical components. As single slot plug-in modules for Keysight's 8163A/B, 8164A/B and 8166A/B mainframes, they are a flexible and cost effective stimulus for single channel and DWDM test applications.