A two-stage amplifier of laser eavesdropping model based on waveguide fiber taper

Study on factors influencing signal-to-noise ratio of the incoherent laser monitoring system

“…Objectively evaluated speech clarity [1] . Wang MT proposed a multi-stage amplifier laser eavesdropping model based on waveguide fiber taper, which proved that the signal-to-noise ratio of the two-stage amplification model can eventually increase to 6-10dB than the single-stage amplification model [2] . HAO H and others discussed the risk of household fiber being used for eavesdropping and demonstrate its performance in the lab.…”

The influence of the horizontal atmosphere on transmission efficiency of the laser eavesdropping

“…To estimate the sensitivity of laser eavesdropping based on the analysis of digital images formed by a single pulse amplification, the sensitivity of the copper bromide brightness amplifier to laser eavesdropping is experimentally determined [7] . Moreover, a new multistage amplifier laser eavesdropping model based on waveguide fiber taper is proposed to improve the ability of amplification on optical arrival angle and enhance the receiving field of view of laser eavesdropping [8] . To increase the accuracy and sensitivity of detection, the parallel light is used as a light source.…”

Estimation method on energy utilization rate of laser eavesdropping system influenced by ambient temperature fluctuation

“…The sensitivity of the laser eavesdropping system is increased by analyzing the digital image formed by single pulse amplification 11 . A multi-stage amplifier model based on the taper of the waveguide fiber is proposed 12 , in order to improve the amplification ability of the light arrival angle and enhance the receiving field of view of the laser eavesdropping system. Additionally, a four-quadrant laser detection method is also proposed 13 to improve the atmospheric adaptability of the laser eavesdropping system.…”