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11980A Fiber-Optic Interferometer

11980A is an interferometer. Used with an Agilent 71400 series or Agilent 83810B lightwave signal analyzer, it allows you to measure chirp and frequency modulation (FM) on DFB lasers.

The Agilent 11980A is a Mach-Zehnder interferometer of fixed delay. Used with an Agilent 71400 series or Agilent 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. Together the interferometer, lightwave signal analyzer, and a gateable RF source permit the display of a true power spectrum of single-frequency lasers. This includes the display of intensity modulation linewidth and components of chirp caused by the intensity modulation.