A new technique for the fast implementation of Brillouin optical time-domain reflectometry has been proposed and demonstrated with the optical chirp chain (OCC) reference wave. By using the fixed bandpass filter and envelope detection, the spontaneous Brillouin spectrum can be online demodulated in the time domain for truly distributed, one-end access and fast measurement. The measurement time is only limited by the pulse repetition rate and averaging times. For a 400 m single-mode fiber, a ${31.58}\;{\rm Hz}$ strain vibration on a 2 m fiber segment is measured for a wide dynamic range (${\sim}{3200}\;\unicode{x00B5} \unicode{x03B5}$) with an equivalent sampling rate of ${200}\;{\rm Hz}$ when 200 times of averaging is performed. Furthermore, the performance on the measurement accuracy is investigated with different OCC frequency spans and durations.

中文翻译：

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使用光学chi链参考波的快速布里渊光学时域反射法

提出了一种快速实现布里渊光学时域反射法的新技术，并通过光学chi链（OCC）参考波进行了演示。通过使用固定的带通滤波器和包络检测，可以在时域中对自发的布里渊频谱进行在线解调，以实现真正的分布式，单端访问和快速测量。测量时间仅受脉冲重复率和平均时间限制。对于400 m的单模光纤，在较大的动态范围内（$ {\ sim} {3200} \; \ unicode可以测量2 m光纤段上的$ {31.58} \; {\ rm Hz} $应变振动{x00B5} \ unicode {x03B5} $），等效采样率为$ {200} \ ;; {\ rm Hz} $当执行200次平均时。此外，研究了在不同OCC频率跨度和持续时间下的测量精度性能。