Research on phenomenon of intermodulation in detection of multi-frequency signals based on acousto-optic deflection

被引：0

作者：

Li X. ^{[1
]}

He N. ^{[1
]}

Deng D. ^{[1
]}

机构：

[1] School of Information and Communication, Guilin University of Electronic Technology, Guilin

来源：

Guangxue Xuebao/Acta Optica Sinica | 2010年 / 30卷 / 09期

关键词：

Bandwidth; Diffraction; Grating; Linear drive; Multi-frequency intermodulation;

D O I：

10.3788/AOS20103009.2504

中图分类号：

学科分类号：

摘要：

The measurements of the information on the carrier frequency can be realized by the acousto-optic deflection effects. However, when the multi-radio frequency signals are simultaneously input to the acousto-optic deflector, the intermodulation between the signals will be generated in the Bragg regime. It causes great difficulties to signal detecting, especially interference from the third-order intermodulation is particularly serious. In response to the intermodulation interference coming from the acousto-optic diffraction, the conditions of generating intermodulation, diffraction distribution, and frequency spectrum are discussed on the basis of the principle of the interaction of the acousto-optic diffraction. Through theoretical analysis, the methods and measures by which the phenomenon of the intermodulation can be reduced are proposed. In order to verify the degree of intermodulation interference in the detection of multi-frequency signals, a test system is constructed. By way of experimental analysis, the conclusion that the intermodulation interferences can be reduced effectively by controlling drive power of radio frequency (RF) properly to ensure that acousto-optic deflector works in linear regions is drawn, when diffraction efficiency in the effective bandwidth of acousto-optic deflector is fixed.

引用

页码：2504 / 2507

页数：3

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