《Tab.1 Computed results of two models for a typical measured signal》

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《布里渊增益谱特征参数提取准确性影响因素分析（英文）》

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In this section，a Corning LEAF（Large Effective Area Fiber）fiber with a length of 9.534 km is used.A typical Brillouin gain spectrum signal is measured by a multi channel optical fiber strain sensing system（N8511，ADVANTEST，Japan）.The wavelength of the incident light is 1 550 nm and the pulse width is 200 ns.The scanned frequency interval is 10 MHz，and the scanned frequency range is 10.75-11 GHz.The number of superposition average of the signal is 211.The parameters extracted by the two models are summarized in Tab.1.The fitted curves and the measured one are shown in Fig.1.