Dual port mach-zehnder modulator in fiber-optic transmission lines of radio frequency signals
The article discusses the possibility of expanding the functionality of fiber-optic transmission lines of microwave signals when using a two-port Mach-Zehnder modulator. The study of signal transmission lines with a two-port Mach-Zehnder modulator in modeling in the OptiSystem17 environment is carried out. Fiber-optic signal transmission lines with a Mach-Zehnder modulator at a linear operating point can transmit signals at one or more frequencies with amplitude, frequency, and phase modulation. At the minimum and maximum operating points, the characteristic of the Mach-Zehnder modulator is nonlinear, harmonics are formed with twice the frequency. Filters at the output of the photodiode allow obtaining sinusoids with double the frequency of the generators and isolating the signal with amplitude modulation. Waveforms and signal spectra at the output of components of communication systems with a two-port Mach-Zehnder modulator during the transmission of analog and radio frequency signals, systems with phase and frequency manipulation, as well as with phase modulation are obtained. The modulation is performed at the optical level, which ensures the broadband and linearity of fiber-optic signal transmission lines with a Mach-Zehnder modulator.