Amplitude response of Fabry-Perot frequency discriminators

The amplitude noise responses of optical-frequency-discriminating systems, based on Fabry-Perot cavities with intensity noise compensation, are analyz ed considering also the effect of the resonator transient. From the point o f view of amplitude noise immunity, systems based on transmission or reflec tion alone behave in a quite similar way within the discriminator bandwidth , whereas a proper combination of both these signals not only increases the sensitivity to frequency noise but also allows for higher rejection to amp litude noise.