KEYWORDS: Signal to noise ratio, Signal detection, Oscillators, Signal processing, Sensors, Laser systems engineering, Laser processing, Wind measurement, PIN photodiodes, Interference (communication)
In order to explore the effect of local oscillator optical power on the signal-to-noise ratio (SNR) of the system under the balanced detection method and the traditional single-channel detection mode in the laser coherent detection system. The numerical simulation analysis of the SNR of the coherent detection system is realized by using the local oscillator power.The self-built laser coherent detection platform is used to explore the influence of the local oscillator power on the system measurement range and SNR in the single-channel detection and dual-channel balance detection under the balanced detection mode. The results showed that: in coherent detection systems, balanced detection has certain advantages over single-channel detection. After calculation, in the detection range of 3km, the measured SNR in the balanced detection mode is higher than the single-channel detection SNR by 2.1.This conclusion has certain reference significance for improving the detection effect of the coherent detection system.
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