Optical Tunable Filter OTF-930
7-7
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-930 steps in increments of 0.001nm and monitors the power at each wavelength.
In
Rapid Mode the OTF-930 initially scans the wavelength range in 1nm steps and finds the
wavelength with the maximum optical power. It then scans in 0.001nm steps over a range of
±1nm about this peak. The Rapid Mode thus enables a rapid scan over a wide wavelength
range, whilst maintaining high accuracy of the acutual peak position to be achieved. The Rapid
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