Mr. Shi Qian Wang Profile

Shi Qian Wang

at Beijing Information Science & Technology Univ

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Proceedings Article | 10 October 2013 Paper

Simulation research of acousto optic modulator drive based on Multisim

Shiqian Wang, Yangkuan Guo, Lianqing Zhu, Yunxiao Na, Yinmin Zhang, Qianzhe Liu

Proceedings Volume 8916, 89161A (2013) https://doi.org/10.1117/12.2035849

KEYWORDS: Modulation, Optical amplifiers, Signal processing, Modulators, Analog electronics, Amplifiers, Switches, Device simulation, Bragg cells, Signal generators

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The acousto optic modulator drive is mainly made with 2 amplitude shift keying (2ASK)circuit, pre-amplifier circuit and power operational amplifier circuit, and the simulation of the acousto optic modulator drive is realized. Firstly, the acousto optic modulator drive works as follows.The modulation function is realized by the analoged switch circuit, and the on-off of the analoged switch chip (CD4066) are controlled by the pulse signal generated by the electronic conversion circuit. The voltage amplification of the modulated signal is achieved by two reverse proportional operation implements voltage amplifier circuit, and the circuit is mainly made with the AD8001 chip. Then the amplified signal is transfered into a two–stage power operational amplifier circuit of class C which is mainly made with the chip of MRF158. Secondly, both of the simulating structures and the union debugging based on the designed system are realized by Multisim. Finally, obtaining the modulation signal of 150(MHz) frequency and 5(μs) pulse width illustrates that a 2ASk modulation of the 150 (MHz)carrier signal and the 20(kHz) modulation signal is achieved. Besides, as the frequency of input signal and amplitude of voltage change, the output power of the power operational amplifier circuit also changes, and the conclusion is drawn that the output power increases when the frequency of input signal decreases and the amplitude of voltage increases. The component selection of the drive’s PCB design, the performance parameter and of the actual circuit and the debugging of the actual circuit are based on the simulation results.

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