Based On The Frequency Doubling Of Microwave Photonics And Frequency Conversion Technology Research

Microwave photonics is an interdisciplinary with the combination of microwavetechnology and photonic technology. It uses optical method to deal with microwavesignal. Radio over fiber technology (ROF), which belongs to microwave photonics, canrealize the high capacity and access free communication in the future, with the flexibleaccess feature in wireless communication and the high bandwidth advantage in opticalfiber communication. In this paper, frequency multiplication or conversion based onmicrowave photonics is the key technology for ROF system. At the central office, thelocal oscillator signal is converted to ROF signal, and then delivered in optical fiber.Finally, the IF or HF is convert into converted signal wanted at the base station.At first, this paper introduced the basic principles and key technologies of ROFand frequency multiplication or conversion on microwave photonics, and gave a reviewof progress in domestic and international. Then this paper discussed the two cascadedMZMs proposal deeply, obtained a general solution to generating a signal. A newmethod was proposed to obtain quadruple signal, with a parallel of two MZMs andoptical delay line. The analysis showed that the extinction ratio of MZM and the drivevoltage would impact on the multiplier performance, and the parallel scheme was betterthan the cascaded one. The simulation results show that the parallel scheme could obtainhigh purity quadruple signal with suppression ratio18dB when the ER of MZM20dBand optical receive power-24.2dBm. Based on the quadruple scheme, a schemerealizing both up-conversion and down-conversion was proposed. Two transmissionmethods were used in the scheme, optical carrier suppression double sideband andoptical single sideband. The analysis showed that the extinction ratio of MZM, theoptical fiber length, the linewidth of laser would impact on the multiplier performance.The simulation results show that a converted signal with BER of10-9can obtained aftermore than100km distance transmission.