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Optical Nonlinearity Estimation Using Increase in Harmonic Content With Increase in Intensity
Optical Nonlinearity Estimation Using Increase in Harmonic Content With Increase in Intensity
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机译:使用谐波含量随强度增加而进行的光学非线性估计
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摘要
A method of estimating non-linearity in a response of an optical detector comprises emitting optical radiation at different intensities. The method includes, at each intensity: amplitude modulating the emitted optical radiation at a modulating frequency to produce amplitude modulated optical radiation; detecting the amplitude modulated optical radiation with the optical detector to produce a detected waveform; and generating a Fourier transform of the detected waveform that includes a fundamental frequency equal to the modulating frequency and harmonics thereof. The method further includes estimating the non-linearity in the response of the optical detector based on a change in an amplitude of a second harmonic of the fundamental frequency relative to an amplitude of the fundamental frequency across the Fourier transforms corresponding to the different intensities.
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