Takada Kazumasa, Yasuno Takahiro
Appl Opt. 2016 May 20;55(15):3993-4000. doi: 10.1364/AO.55.003993.
We describe theoretically and experimentally how valuable information on the distributed Brillouin spectra of an optical waveguide is derived from the stationary Brillouin grating measurement under uniform pumping over the waveguide by using the coherent frequency-modulated continuous wave reflectometry. We upconvert the frequencies of the probe and pumping light waves by the Brillouin frequency with one modulator and detect the Stokes light in the same way that we detect the Fresnel and Rayleigh backreflections in the fiber. The intrinsic coherent spike is reduced by using the lock-in detection and the least squares method to reveal the distributed Brillouin spectra of a short optical fiber consisting of two different fibers spliced together.
我们从理论和实验两方面描述了如何通过使用相干调频连续波反射测量法，在均匀泵浦光波导的情况下，从固定布里渊光栅测量中获取光波导分布式布里渊光谱的有价值信息。我们使用一个调制器将探测光和泵浦光的频率通过布里渊频率进行上转换，并以检测光纤中菲涅尔反射和瑞利后向反射的相同方式检测斯托克斯光。通过采用锁相检测和最小二乘法来降低固有相干尖峰，以揭示由两根不同光纤拼接而成的短光纤的分布式布里渊光谱。
