EXFO FLS-2600B Tunable Laser Source - Manual (Page 25)

Setting Standard Parameters
Tunable Laser Source 17
Switching between Normal and High-Resolution (HR) Modes
Switching between Normal and
High-Resolution (HR) Modes
In HR mode, the laser linewidth is reduced by a factor of 20 %. Typically, at
1550 nm, the Normal mode will produce a 1.6 GHz FWHM linewidth, while
the HR mode will produce a 1.4 GHz FWHM linewith. The tuning range
(or power at extreme wavelength) might be smaller in HR mode than in
Normal mode.
To select the operation mode:
Press the mode control button on the front panel.
Adjusting Decimals Using the Fine-Tune
Feature
You can select values for your testing needs in two different ways:
Fine-tune and Coarse. If you press the Fine-tune button on the front panel,
Fine-tune appears on the display and you will be able to set the decimals.
If Fine-tune does not appear on the display, you are in Coarse mode and
can only adjust the numbers before the decimal point with the
selection dial.
Note: The Fine-tune feature applies to every numerical edition function with a
decimal point except in the Adjust submenu of the Setup menu.
See Adjusting Your Unit According to Wavelength on page 54 for more
information.