As an important method of signal receiving and processing, acousto-optic receiver can intercept wideband signal in RF domain. A large number of narrow channels for measuring RF signal can be realized by acousto-optic Bragg diffraction. The weak signal detection with high sensitivity can be implemented using time integrating photodetector array. In this paper, the principle and characteristics of time integrating acousto-optic receiver are investigated. The acousto-optic receiver with 1GHz bandwidth is demonstrated in experiment.
Erbium-doped fiber amplifier (EDFA) is widely used in the optical communication system, and it is usually used as a linear amplifier in most scenarios. However, in analog photonic links, we observe the nonlinear spurs caused by EDFA. In the analog photonic link, the dynamic range is one of the most important characteristics while the nonlinear spurs set the upper limit of input signal power. We study the nonlinearity caused by EDFA in analog photonic links when the input power of EDFA fluctuates at a low frequency. We have theoretically and experimentally studied the characteristics of the nonlinear spurs caused by EDFA.
RF photonic link can provide significant benefits in transmitting and distributing RF signals to many separating stations by optical fiber. However, phase noise of transmitted RF signal in electrical-optical-electrical conversions is generally deteriorated by related optical noise. In this paper, a theoretical model about phase noise of RF photonic link is built, and the expressions and characteristics about phase noise are investigated. In the RF photonic link, phase noise is investigated for 100MHz RF signal. The experimental results can agree with the theoretical analysis.