EXFO IQS-2400 WDM Laser Source for IQS-500/600 - Manual (Page 28)

Setting Up the WDM Laser Source
22 IQS-2400
Selecting a Control Mode
High
Wavelength
Stability
³
Used when central wavelength
stability is critical.
³
Current is constant, thus
maintaining wavelength
stability. Once power and
wavelength have been set to
the required levels (in Normal
mode), select High Wavelength
Stability mode to enhance
wavelength stability at the
established value. A limited
tuning range is permitted
around this value (± 1 °C for
wavelength or ± 1 mA for
current). Power stability can be
enhanced after a very long
stabilization period (typically 2
days).
Even though wavelength
and power are displayed in
light green, they cannot be
adjusted. Both modes are
used for fine-tuning laser
temperature and current on
a limited range around
nominal wavelength and
power levels reached in
Normal mode. Laser
temperature and current are
displayed just below the
power value.
On/Off
Modulation
³
This mode (50 % duty cycle)
uses half the average power
available from the source
module. It controls current
during the “on” cycle of the
signal.
³
The tuning range for
temperature and current are
the same as in High
Wavelength Stability mode.
Mode Explanation Display