For example: Agilent E4440A or Anritsu 68369
Power Sensor Module +3 to -90dBm
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Keysight / Agilent 81531A Overview
Optical power sensor module for 8153A Lightwave Multimeter. Wavelength range 800NM to 1700NM. Dynamic range +3dBm to -90dBm. Should be ordered with at least one connector interface 81000xI.