For example: Agilent E4440A or Anritsu 68369
Portable Standard Optical Spectrum Analyzer with Filter Mode [Discontinued]
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Keysight / Agilent 86144B Overview
The Agilent 86144B is a portable standard optical spectrum analyzer with a filter mode that provides the flexibility to drop a single DWDM channel as tight as 12.5 GHz spacing with fast-tuning speed, low-insertion loss, and highly repeatable wavelength accuracy.