EXFO T200S, Руководство пользователя, Страница: 34 / 146

Setting the Emission Wavelength/Frequency
28
T200S
Tuning the Emission Wavelength or Frequency
Applying a Predefined Step (Relative Tuning)
This section explains how to configure the step values and then manually increase or
decrease the emission wavelength/frequency step by step: this moves the laser relatively
from the absolute wavelength/frequency position (see
Setting the Emission Value (Absolute
Tuning)
on page 27), which means that the high accuracy specification cannot be met.
³
In High accuracy mode, you can define the wanted step values. Tuning the laser using
steps (reached relatively from the absolute wavelength/frequency position) cancels
high accuracy.
³
In
Optimized linewidth
mode, the steps are set to 0.005 nm and 0.001 nm (or 0.5 GHz
and 0.1 GHz) and cannot be modified.
To define the tuning steps (High accuracy mode only):
1.
In the
TUNE
mode window, touch the button.
The mode setting menu appears.
2. Make sure the
Tune parameters
setting is set to
High accuracy
.
3.
In the Tune control area, touch a step value and type the wanted value by using the
keypad.
4.
Define the wanted step value for each of the five available steps.
5. Touch anywhere on the screen outside the menu to exit the mode setting menu.
The defined steps are displayed in the Step area of the TUNE mode window.