Multi-Port Optical Power Meter MPM-210
5-17
■ 5-5-5 A method for wavelength compensation
The MPM-210 has wavelength calibration values of each port. Number of calibrated
wavelength is 20. (From 1250nm to 1630nm with 20nm space). Wavelength between
each calibrated wavelength is calculated using 1’st Order linear interpolation. You
can check calibrated wavelength with “CWAV?” command. Calibrated values of 20
wavelengths can be checked also with “CWAVPO?” command.
Calibration Wavelength: 1250, 1270, ~, 1630 nm, Interval: 20nm
Calibration Optical power Offset Unit: dB
1 Order Linear Interpolation
y = (y1-y0)/(x1-x0)*(x-x0) + y0
x: wavelength, y: optical power offset
Run measurement with fixed wavelength in FREERUN measurement mode. Optical
power value that was measured with the MPM-210 executes calibration for the fixed
wavelength. To do calibration for other wavelengths, refer to following formula.
WOPn is calculated with 1 Order Linear Interpolation after getting data using “CWAV?”
and “CWAVPO?”.
FWOP is the calibrated value of wavelength that was set using “WAV”. We
recommend to set wavelength as 1550nm. Set wavelength of equipment that are used
for calibrating MPM-210 is 1550nm. Optical power of wavelength that is set using
“WAV” does not need to be wavelength calibration.
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