For example: Agilent E4440A or Anritsu 68369
Optical Head Module, Ge, 900-1700nm, -80dBm
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Keysight / Agilent 81521B Overview
Optical head to be used with 81533B interface module and 8153A Lightwave Multimeter. 900NM to 1700NM. +3dBm to -80dBm. Accuracy 2.2%. Lenses and adapters must be ordered separately.