摘要
为了解决3×3耦合器相位解调中,输出的3路信号分光比不均匀和相位差不能严格满足120°的非对称问题,采用了一种新型的3×3耦合器解调方案,并进行了理论分析和实验验证。利用均值算法对输出的任意两路信号分别进行预处理,压缩原始3路输出信号之间的功率与相位的偏差,使经过矫正后新的3路信号近似为对称状态输出。根据仿真与实验的结果,分析了耦合器输出的对称性条件和新型解调方案的抗噪声能力。结果表明,该新型解调方案可以有效矫正3×3耦合器3路输出信号的非对称性,新方案的噪声水平约为10^-4mW,信噪比约为50dB,与传统的解调方案相比,可以得到准确度与信噪比更高的待测信号。这一结果对光纤相位解调领域有很好的指导作用,加速了光纤传感技术的实用化进程。
In the fiber optical sensor demodulation based on asymmetric 3×3 coupler,the fiber-optic median phase shift 3×3 adder due to the limitation of the manufacturing process and the susceptibility to external environmental interference,and then the three-way signal output has an uneven splitting ratio and an asymmetric phenomenon that the phase difference cannot meet 120°,which causes a problem that could not be accurately corrected.In order to solve these problems,a new 3×3 replacer was used,and theoretical analysis and experimental verification were performed.The mean two algorithms were used to pre-process any two signals output,and compressed the original three signals.The power and phase difference between the output signals of the two channels make the new three-channel signals after correction to be approximately symmetrical output,and then perform a symmetric algorithm operation.Simulation and experimental results show that the new scheme can effectively correct the asymmetry of the three output signals of the positive 3×3 converter,and classify it.Noise level of the new scheme is about 10mW and signal-to-noise ratio is about 50dB.Compared with the traditional alternative scheme,the new structure can obtain higher accuracy and signal-to-noise ratio of the signal under test.In addition,according to the simulation and experimental results,the symmetry conditions of the output of the replacer and the anti-noise capability of the new superposition scheme are analyzed.The result has a good guiding role in the field of optical fiber polarizers and accelerates the practical process of optical fiber sensing technology.
作者
梁育雄
黄毓华
王升
宁娜
LIANG Yuxiong;HUANG Yuhua;WANG Sheng;NING Na(Zhuhai Power Supply Bureau, Guangdong Power Grid Company, Zhuhai 519000, China;Allian Stream Photonics Techno-logy Co. Ltd., Wuxi 214000, China)
出处
《激光技术》
CAS
CSCD
北大核心
2021年第1期25-30,共6页
Laser Technology
基金
中国南方电网有限责任公司科技项目(GDKJXM20172837,030400KK52170062)。
