Research and verification of high-speed data receiving front-end technology of TT&C system based on Microwave Photonics: Invited Paper

Modern TT &C system needs to cover multiple RF frequency bands from s to Ka and provide instantaneous signal bandwidth processing capacity above 1 GHz to meet the needs of high-precision measurement and control and high-speed data transmission. Restricted by the “electronic bottleneck”, it is difficult to directly sample and digitize the 2-30ghz RF signal in the RF domain, and the performance of the TT &C system is difficult to be further improved. Aiming at the broadband multi band sampling problem faced by the RF front-end of the traditional TT &C system, this paper adopts the photoelectric hybrid analog-to-digital conversion technology to generate high stability high repetition frequency ultrashort optical pulse based on the optical nonlinear transmission line, and uses electro-optic modulation to load the broadband signal to be sampled onto the envelope of ultrashort optical pulse sequence to complete optical sampling, The rate matching between high-speed optical sampling and low-speed electrical quantization coding is realized through optical time-domain decomposition and multiplexing technology, and the digitization of ultra wideband microwave signal is realized. The principle prototype is developed and tested. The results show that the sampling rate reaches 20Gsps, the adaptive bandwidth reaches 5.1 GHz, the working frequency band covers from S to Ka band, and the transmission length reaches 3.01km. The relevant results can provide reference for the development of broadband TT &C system in the future.