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通过实验研究了一种光子晶体光纤环形移频器,该移频器基于布里渊频移原理,利用光子晶体光纤布里渊增益高、阈值低的特点,同时利用光纤环形腔选频放大技术获得窄线宽高增益激光输出。实验结果表明:在波长为1 548 nm单纵模光纤激光泵浦下,10 m长光子晶体光纤的受激布里渊散射阈值功率约为457mW,环形腔输出的受激布里渊散射Stokes光相对于入射光移频量为9.778GHz、线宽500 kHz,并且移频量可以通过温度进行微调。该移频器可以用于分布式光纤布里渊传感器和微波发生器。
A photonic crystal fiber ring frequency shifter based on Brillouin frequency shift is studied experimentally. Based on the characteristics of high Brillouin gain and low threshold of photonic crystal fiber, Get narrow linewidth high gain laser output. The experimental results show that the stimulated Brillouin scattering threshold power of a 10 m long photonic crystal fiber is about 457 mW at a wavelength of 1 548 nm and a stimulated Brillouin scattering Stokes light With respect to the incident light shift frequency of 9.778GHz, line width 500kHz, and the frequency shift amount can be fine-tuned by temperature. The frequency shifter can be used for distributed fiber Brillouin sensors and microwave generators.