RESUMEN
In this paper, we propose a system for enhancing the RF output power of the photodetector, especially the power of fundamental tune and second-order harmonic, by feeding back part of the RF signal through an electrical feedback circuit. As a result of bias modulation and opto-electric mixing, the RF output power can be effectively enhanced. The structure of uni-traveling carrier photodetector (UTC-PD) is employed in this work. With the RF enhancement system, the power of fundamental tune and second-order harmonic improve by 6.4â dB and 9.9â dB respectively, under the condition of 26 dBm input optical power, 3â V bias voltage, and 14â GHz input optical signal. Further, it was observed that third-order harmonic appeared under the influence of this system.