These two sampled signals are combined at the outer port of the SOA–MZI, beneficial to acquiring the mixed signal. The IF signals are capable of regulating the carrier density of each SOA by their bias currents in the upper and lower arm, and then the sampling signal will be directly modulated by the IF signals in both arms. In this scheme, two subcarriers at f I F, which have similar characteristics, are entered into the electrode of upper and lower SOAs leading to fine-tuning their bias currents. The proposed differential modulation relies on two electrical subcarriers in the MZI. Thus, the comparison between them confirms that they have approximately the same performance. During the experimental work, the results obtained in simulations are set side by side with the factual ones in the frequency range up to 59 GHz. The EVM reaches 14% at a data rate of 5 Gbit/s at 195.5 GHz. The EVM is used to evaluate the performance of the electro-optical sampling up-convertor. The positive conversion gain is accomplished over the mixing frequencies. We conducted simulations of mixing in the SOA–MZI operating in a high-frequency band up to 195.5 GHz. (VPI), we generate sampled QPSK signals and analyze their merits during conversion gains and error vector magnitudes (EVMs). Using a simulator entitled Virtual Photonics Inc. The quadratic phase shift keying (QPSK) signal at an intermediate frequency (IF) f I F is shifted to high frequencies n f s ± f I F at the SOA–MZI output. The sampling signal is generated by an optical pulse clock (OPC) at a frequency of f s = 19.5 GHz. In this paper, we present a real and simulated study of a frequency up mixing employing an electro-optical sampling semiconductor optical amplifier Mach–Zehnder interferometer (SOA–MZI) along with the differential modulation schema.

Electro optical sampling