空间扫描型多通道光纤F-P解调系统中LED光功率自适应方法

发布时间：2018-03-15 10:23

本文选题：光纤Fabry-Perot(F-P)　切入点：LED　出处：《光电子·激光》2017年04期 　论文类型：期刊论文

【摘要】：针对空间扫描型多通道光纤Fabry-Perot(F-P)解调系统中LED输出光功率变化及通道间光功率损耗差异引起解调系统信噪比(SNR)下降进而影响解调精度的现象,提出一种基于差分滤波法评价SNR水平的快速LED输出光功率自适应调节方法,通过模拟调光方式使低相干干涉信号维持较高的SNR水平。搭建四通道光纤F-P压力解调系统进行实验研究,结果表明,本文方法可在0.36s之内恢复链路损耗突变造成的SNR波动;在5~150kPa压力范围内,最大压力解调误差为0.038kPa,解调精度优于0.03%(F.S.)(F.S.表示全量程),与以往固定光源功率方法相比,精度提高2.28倍以上;在102kPa下采用本文方法调节后的各通道SNR均优于26.5dB,有效提高了光功率变化情况下光纤F-P系统SNR及解调精度的稳定性。
[Abstract]:Aiming at the phenomenon that the signal to noise ratio (SNR) of the demodulation system decreases due to the variation of LED output optical power and the difference of optical power loss between channels in the spatially scanned multichannel fiber Fabry-Perot (F-P) demodulation system, which affects the demodulation accuracy. In this paper, a fast LED output optical power adaptive adjustment method based on differential filtering method is proposed to evaluate the SNR level. A four-channel fiber F-P pressure demodulation system is built for experimental study. The results show that the proposed method can recover the SNR fluctuation caused by the sudden change of link loss within 0.36 s. In the pressure range of 150 KPA, the maximum pressure demodulation error is 0.038 KPA, and the demodulation accuracy is better than 0.03 F.S. / F.S. the precision is more than 2.28 times higher than that of the previous fixed light source power method. At 102 KPA, the SNR of each channel adjusted by this method is better than 26.5 dB, which effectively improves the stability of SNR and demodulation accuracy of F-P optical fiber system under the condition of optical power change.
【作者单位】：天津大学精密仪器与光电子工程学院光纤传感研究所光电信息技术教育部重点实验室;
【基金】：国家重大科学仪器设备开发专项(2013YQ030915) 国家“973计划”(2010CB327802) 国家自然科学基金(61227011、61378043、61475114、61505139) 教育部科学技术研究重大项目(313038) 天津市自然科学基金(13JCYBJC16200、16JCQNJC02000) 深圳市科技创新委员会(JCYJ20120831153904083) 中国空间技术研究院CAST创新基金资助项目
【分类号】：TN253;TN312.8

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