The linearity of a wideband RF power transistor amplifier is improved by including output matching circuit and an integrated biasRF diplexer with RF and video bypassing capacitor network within the transistor package and connected directly to the transistor. The non-reciprocal rotating element has a rotation axis and rotates the polarization of light passing through it by an predetermined angle. The write current circuit further includes programming circuitry driven such that several parameters of the write current waveform can be controlled, including the write current amplitude, overshoot amplitude and overshoot duration. The lightwave falls on the filter at least at two incident angles. In addition, the system and the method are compatible with existing LTE systems, thus realizing high-order Multiple Input Multiple Output transmission, supporting the usage of the corresponding techniques. In order to check authenticity, a carrier-frequency signal is transmitted to the circuit and an output signal representing an authenticating feature is emitted from raid circuit in response to said input signal and detected.