The 11980A is a Mach-Zehnder interferometer of fixed delay.
Used with a Agilent Keysight 71400 series or 83810B lightwave signal
analyzer, it allows you to measure chirp and frequency modulation (FM)
on DFB lasers. Traditional measurements of laser linewidth on
single-line lasers can also be made.
Good used condition. Cleaned, inspected, and tested. Opt 005 installed. Reference images for item condition.