基于布里渊相干域分析(BOCDA)原理，采用布里渊增益和损耗级联的方案优化BOCDA系统，在理论分析和实验验证基础上进行样机研制和功能验证。受激布里渊散射过程中的布里渊增益和损耗效应具有相同的布里渊增益谱特性，它们的级联不仅能提高布里渊净增益、系统信噪比和高精度，同时还可降低系统复杂度和系统成本。使用双平行调制器、两级光放大器、扰偏器、模电优化设计和数据采集处理等单元，研制了一套原理样机。实现了测量空间分辨率达1.6 cm、测量精度达10 με(或0.5 ℃)的分布式光纤传感样机。

This paper proposes and demonstrates a novel scheme to improve the traditional Brillouin optical correlation domain analysis(BOCDA) system by combining Brillouin gain and loss effects. Thanks to the net gain measurement between the Brillouin gain and loss, the signal-to-noise ratio of the novel scheme is two-fold enhanced, but a also the scheme system needs fewer devices. We develop a prototype of the modified BOCDA system for distributed strain/temperature sensing by utilizing DMZM, two-level EDFA, polarization scrambler optimized circuit design and data acquisition technique, which has high spatial resolution of 1.6 cm, and high accuracy of 10 με (or 0.5 ℃).