How to calculate the nonlinearity of an optical power meter
The nonlinear phase shift ϕSPM of the signal can be obtained from the measurement of the intensity ratio I0 /I1 of the fundamental wavelength to the first-order sideband , , i. These methods were compared analytically using a unified mathematical expression for nonlinearity [1-3]. We have developed a system for measuring the nonlinearity of optical power meters or detectors over a dynamic range of more than 60 dB at telecommunications wavelengths. Evaluation of the measurement uncertainty shows that the most significant source of uncertainty is the measurement of fiber-optic power.
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