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介绍了一种由在ＳＴ切石英晶体上制成的声表面波器件驱动，工作频率为５０ＭＨｚ的单模光纤声光移频器．在单模光纤模式理论和声表面波理论的基础上，探讨了二者的相互作用及实现调制的机理．对该器件进行的测试结果表明，利用单模光纤作为调制信号载体，从而实现移频是可行的
A single mode fiber optic acousto - optic frequency shifter driven by a surface acoustic wave device fabricated on ST - cut quartz crystal and operating at 50 MHz is introduced. Based on single-mode optical fiber mode theory and surface acoustic wave theory, the interaction between the two and the mechanism of modulation are discussed. The test results of the device show that the use of single-mode fiber as a modulated signal carrier, so as to achieve frequency shift is feasible