OPTICAL TUNABLE FILTER OTF-920
7-7
7.5. Wavelength Setting
2. Press the numeric keys 1 or 2 to toggle the respective sliders between 'Active' and Fixed'.
3. When either Slider 1 or Slider 2 has been selected as 'Active' and the other slider is 'Fixed'
pressing the Option Key a second time allows the 'Active' slider to be moved by an offset
amount. The display will show d 00.000 as the offset amount. Enter the required offset
value using the Numerical Keypad. Pressing ENT will set the offset for the selected
'Active' slider. To cancel this operation without entering a value press the Attenuation /
Wavelength Selector Key.
It is also possible to completely remove either one or both sliders from the path of the optical
beam. The procedure is described below.
1. Press the Shift Key followed by the CAL Key. The display will show one of the following:
SO 1 2
Slider 1 Removed, Slider 2 Removed
SO 1
Slider 1 Removed, Slider 2 Active
SO 2
Slider 1 Active, Slider 2 Removed
SO
Slider 1 Active, Slider 2 Active
2. Press the numeric keys 1 or 2 to toggle the respective sliders between 'Removed' and
'Active'.
3. Press the CAL Key to register the selection and remove or activate the sliders. To cancel
the operation without changing the slider selection press the Attenuation / Wavelength
Selector Key.
7.6. Peak Search
The Peak Search function operates by scanning through a range of wavelengths and measuring
the power at every point. The filter then automatically sets itself to the wavelength with
maximum optical power. The Peak Search uses the currently set wavelength as the center
wavelength for the scan, and allows the scan range to be set. This method allows the peak of a
signal to be selected even from a comb of wavelengths such as that might be found in a DWDM
system, and by minimizing the scan range allows rapid setting and signal optimization. The
default scan range is
±
1.0nm. The Peak Search function has two modes. In the standard mode
the OTF-920 steps in increments of 0.001nm and monitors the power at each wavelength. In
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