46 Keysight N777-C Series Tunable Laser Family User’s Guide
3 Definition of Terms
Figure 15 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
photo-detector. The electrical noise spectrum of the photo-detector
current is measured with a Lightwave signal analyzer, and the line-width
calculated from the heterodyne spectrum. (Lightwave signal analyzer
settings: resolution bandwidth 1 MHz, video bandwidth 10 kHz,
sweep time 20 ms, single scan).
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