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IM 703753-01E
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Measurement Method
In the measurement of strain, temperature, and other items using the FBG sensor, strain,
temperature, and other items can be derived by measuring the reflection spectrum from
the grating area that forms in the optical fiber. The FBG wavelength monitor is a useful
instrument for measuring the wavelength.
This section describes how the optical wavelength and optical power level are measured
using the FBG Sensor Monitor. The center wavelength and its optical power level is
calculated from the power distribution of the optical signal obtained by multiple PD
elements and the wavelength that is pre-assigned to each PD element.
You can set appropriate measurement conditions by changing parameters such as the
average count, threshold value, and offset value. Furthermore, the optical wavelength
and optical power level are calibrated before the instrument is shipped from the factory.
Commands are also provided to compensate the results of these measurements if such
compensation is necessary after the instrument is installed in the system.
Computed result of center wavelength
Reflection spectrum of FBG
Optical wavelength
Device output
Optical po
wer
