Microwave photonic link nonlinear parameter measurement method and device

Abstract

The invention discloses a microwave photonic link nonlinear parameter measurement method. According to the method, a microwave photon link nonlinear model is established by using Taylor series, then the power of a fundamental frequency component and the power of an intermodulation stray component are extracted, and the value of gamma and a nonlinear coefficient can be directly obtained from measurement data by introducing a dimensionless parameter gamma, so that an intermodulation cutoff point and a stray-free dynamic range of the link can be obtained. The invention further discloses a microwave photon link nonlinear parameter measuring device. Compared with an existing few-sample fitting method, extraction of the nonlinear parameters of the link is studied on the basis of the intrinsic nonlinear coefficient, the measurement precision of the nonlinear parameters of the microwave photon link is further improved, and measurement of a spurious-free dynamic range does not depend on a measurement result of a third-order truncation point, so that the measurement precision of the nonlinear parameters of the microwave photon link is improved. Required nonlinear parameters can be flexibly selected according to needs. The method has universality and simplicity, and can be applied to different microwave photon links.

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