利用双晶体实现的低频保偏光纤声光移频器

A Polarization Maintaining Fiber Coupled Acousto-Optical Frequency Shifter Via Double Crystals For Low Frequency Shifting

该文介绍了一种低频保偏光纤声光移频器的设计、制作、性能参数及典型应用。采用双晶体反向级联设计,将两片晶体工作频率的差值作为器件的移频频率,避免了单片声光晶体难以实现低频声光移频的问题。样品获得的性能参数为:工作波长1 053nm,移频频率10 MHz,插入损耗3.3dB,光上升时间33ns,输出偏振态线偏振。

The design,fabricating,performance perameters and typical application of a polarization maintaining fiber coupled acousto-opticl frequency shifter（AOFS）for low frequency shifting is introduced in this paper.The double-crystal reverse-cascading design method,i.e.the difference values between the operating frequencies of two AO crystals is used as the frequency-shifting frequency,is used to overcome the problem that a single crystal is difficult to achieve low frequency shifting.The performance parameters of the sample are as followa：working wavelength of 1 053 nm,frequency shift of 10 MHz,insert loss of 3.3dB,rise time of 33 ns and linear polarization output.