A High Linearized Microwave Photonic Link Under Dual-Tone Modulation

In this paper, a schematic of high linearized microwave photonic link under dualtone modulation is proposed and analyzed. On the basis of dual parallel Mach-Zender modulator (DPMZM), by utilizing only two simple and mature electrical phase shifters, and by optimizing the biases of the DPMZM, third-order inter-modulation distortion (IMD3) introduced by all optical sidebands is eliminated completely in theory. Besides, the corresponding simulation setup and experimental setup for testing the linearization of microwave photonic link are built, and parameters such as third-order inter-modulation distortion (IMD3) suppression, spurious-free dynamic range (SFDR) are simulated and demonstrated in detail. Test results are in good accordance with the theoretical prediction.