Keysight N777-C Series Tunable Laser Family User’s Guide 47
Definition of Terms 3
Linewidth
The 3 dB width of the optical spectrum, expressed in Hertz.
Conditions: Coherence control off. Other conditions as specified.
Measurement: Using a self-heterodyning technique: The output of the laser under test is
sent through a Mach-Zehnder interferometer in which the length
difference of the two arms is longer than the coherence length of the laser.
The electrical noise spectrum of the photo-detector current is measured
using a Lightwave signal analyzer or Keysight Optical Modulation Analyzer,
and the linewidth calculated from the heterodyne spectrum.
Alternatively, Using a heterodyning technique: The output of the laser
under test is mixed on a wide bandwidth photo-detector with another laser
of the same type or with a laser with a line-width much lower than the
laser to be measured. The electrical noise spectrum of the photo-detector
current is measured using a Lightwave signal analyzer or Keysight Optical
Modulation Analyzer, and the linewidth calculated from the heterodyne
spectrum.
Maximum output power
The maximum achievable output power of the tunable laser source and the
maximum output power for which the tunable laser source specifications
apply.
Figure 16 Maximum Output Power vs Wavelength, Maximum
Flat Output Power vs Wavelength
Conditions: As specified.
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