EXFO IQS-2400 WDM Laser Source for IQS-500/600 - Manual (Page 27)

WDM Laser Source 21
4 Setting Up the WDM Laser
Source
Selecting a Control Mode
The IQS-2400 WDM Laser Source offers the following control modes:
Mode Explanation Display
Normal
³
To maximize output power
stability.
³
Default mode used to tune
wavelength and power
throughout their respective
ranges (2 nm for wavelength
and 10 dB for power).
³
To maintain power at the
specified level, the monitor
current at the back end of the
laser will be held constant.
Laser current intensity is
adjusted in real time to
produce a constant output
power. Since peak wavelength
varies with laser current
intensity, the emission
spectrum is slightly enlarged.
During laser stabilization,
spectral value (wavelength
or frequency) and power are
displayed in dark green;
however, adjustments can
be made by using the
control center buttons. After
laser temperature
stabilization, both values are
displayed in light green.
For Normal mode only: if
you use Relative value,
reference values appear at
the bottom right-hand side
of the display (see
Configuring
Wavelength/Frequency or
Delta Temperature on page
29 and Configuring Power or
Delta Current on page 33).
Dither
Modulation
³
Combination of Normal mode
and dithering.
³
In this mode, you can have a
1 mA to 5 mA tone (dithering),
which can either be a square
or triangular wave.