User`s guide

Specifications Definition of Terms
38 Agilent 81600B Tunable Laser Source Family, Fourth Edition
Dynamic power reproducibility (continuous
sweep mode)
Specifies the random uncertainty in reproducing the output power at the
same actual wavelength in different sweeps. It is expressed as ± half the
span between the maximum and minimum of all actual output powers.
Figure 8 Dynamic power reproducibility (continuous sweep mode)
Conditions: Uninterrupted tunable laser source output power, constant temperature,
no mode-hop. Other conditions as specified.
Dynamic relative power flatness
(continuous sweep mode)
The high frequency part of the dynamic power flatness, obtainable by
referencing the power measured at high sweep speed to the power
measured at low sweep speed.
Conditions: Uninterrupted tunable laser source output power, constant power setting,
constant temperature, no mode-hop. Other conditions as specified.
Measurement: Reference sweep speed value 0.5 nm/s.
Effective linewidth
The time-averaged 3 dB width of the optical spectrum, expressed in Hertz.
Conditions: Coherence control on. Other conditions as specified.
Measurement: 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 with 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).