User`s guide

Specifications Definition of Terms
40 Agilent 81600B Tunable Laser Source Family, Fourth Edition
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 photodetector current is measured
using an
Agilent Lightwave signal analyzer, and the linewidth calculated from the
heterodyne spectrum.
Alternatively, Using a heterodyning technique: The output of the laser
under test is mixed with another laser of the same type on a wide
bandwidth photodetector. The electrical noise spectrum of the
photodetector current is measured using an Agilent Lightwave signal
analyzer, and the linewidth calculated from the heterodyne spectrum.
(Lightwave signal analyzer settings:
resolution bandwidth 1 MHz, video bandwidth 10 kHz,
sweep time 20 ms, single scan).
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 9 Maximum Output Power vs Wavelength, Maximum Flat Output Power vs Wave-
length
Conditions: As specified.
Measurement: Using a power meter at the end of a 2 m single-mode fiber patchcord.