44 Keysight N777-C Series Tunable Laser Family User’s Guide
3 Definition of Terms
Definition of Terms
This section defines terms that are used in this document and in the data
sheet.
Measurement principles are indicated. Alternative measurement principles
of equal value are also acceptable.
General Definitions
Constant Temperature
Where required, is a stable operating temperature within ±1 K.
Logged wavelength
This is the wavelength measured and recorded by the internal wavelength
meter during a sweep at the corresponding trigger signal. This recorded
wavelength can be read with the logging function.
Stepped mode
In stepped mode the tunable laser source is operated statically, so that a
user's measurement is made at a fixed wavelength of the tunable laser
source. When tuning to a new wavelength, the static specifications are
valid after completion of the tuning operation.
Continuous sweep mode
In continuous sweep mode the tunable laser source is operated
dynamically, so that a user's measurement is made while the wavelength
of the tunable laser source changes in a defined way (given by start
wavelength, end wavelength and sweep speed). During a continuous
sweep the dynamic specifications and the
“Logged wavelength“ apply.
The logged wavelength positions during a sweep depend on
environmental conditions and may differ slightly between repeated
sweeps.
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