基于受激布里渊散射的有源光学滤波器偏振特性研究

发布时间：2018-12-07 16:22

【摘要】：受激布里渊散射(SBS)是光纤中一种重要的非线性效应。由于其具有极窄的增益带宽,在光纤通信与传感中常被用作有源光学滤波器。本论文着重讨论了基于SBS效应的有源光学滤波器(SBS-AOF)的偏振特性,在此基础上探求了偏振态操控对基于SBS-AOF的超高分辨率光谱测量技术性能提升作用。此外还利用前述超高分辨率光谱测量装置实现了偏振模色散的测量。论文主要工作包括:(1)从描述SBS效应中信号光和泵浦光互作用机制的电场矢量微分方程出发,使用光纤的随机串联波片模型对随机双折射光纤中SBS效应的偏振特性进行了理论分析和仿真计算。结果表明SBS过程带来的增益会随输入信号偏振态有规律的变化,并且会使得输出信号的偏振态最终偏向能够获得最大增益的方向,即发生偏振牵引效应。当信号光和泵浦光输入偏振态一定时,SBS峰值增益具有一定的波长相关性,但是增益变化在较小的波长范围内并不明显。(2)给出了一种利用偏振牵引效应来改善基于SBS-AOF的超高分辨率光谱测量系统动态范围的方法,对这种方法的实际效果及适用性进行研究与探讨。实验研究发现,该方法在测量功率较大并且光谱较窄的光信号时,对动态范围有较大的提升。在泵浦功率为8dBm时,使用该方法测量功率为-1dBm的100MHz正弦波调制光信号,测量光谱动态范围可提升8dB。(3)基于前述的超高分辨率光谱测量装置,实验研究了偏振模色散的测量方法。利用SBS-AOF增益的偏振相关特性,测量在六种特定的泵浦光偏振态情况下的超高分辨率光谱,实现相应斯托克斯参量的获取。依托自行开发的算法计算得到偏振模色散矢量。从而实现了对保偏光纤一阶偏振模色散的测量。
[Abstract]:Stimulated Brillouin scattering (SBS) is an important nonlinear effect in optical fiber. Because of its narrow gain bandwidth, it is often used as an active optical filter in optical fiber communication and sensing. In this paper, the polarization characteristics of active optical filter (SBS-AOF) based on SBS effect are discussed, and the effect of polarization manipulation on the performance of ultra-high resolution spectral measurement based on SBS-AOF is explored. In addition, the polarization mode dispersion (PMD) is measured by using the above-mentioned ultra-high-resolution spectrometer. The main work of this paper is as follows: (1) starting from the electric field vector differential equation which describes the interaction mechanism of signal and pump light in SBS effect, The polarization characteristics of SBS effect in random birefringent fiber are theoretically analyzed and simulated by using the random series wave plate model of optical fiber. The results show that the gain of the SBS process varies regularly with the polarization state of the input signal, and the polarization state of the output signal will eventually deviate to the direction in which the maximum gain can be obtained, that is, the polarization traction effect will occur. When the input polarization state of the signal and pump light is constant, the peak gain of SBS has a certain wavelength correlation. However, the gain change is not obvious in a small wavelength range. (2) A method is proposed to improve the dynamic range of ultra-high resolution spectral measurement system based on SBS-AOF by using polarization traction effect. The practical effect and applicability of this method are studied and discussed. The experimental results show that the proposed method can improve the dynamic range of optical signals with high power and narrow spectrum. When the pump power is 8dBm, using this method to measure the sinusoidal modulated optical signal of 100MHz with power of-1dBm, the dynamic range of measurement spectrum can be increased by 8 dB. (3) based on the ultra-high resolution spectral measurement device, The measurement method of polarization mode dispersion (PMD) is studied experimentally. Based on the polarization correlation characteristics of SBS-AOF gain, the ultra-high resolution spectra of six specific pump states are measured, and the Stokes parameters are obtained. The polarization mode dispersion vector is calculated by the self-developed algorithm. Thus, the first order polarization mode dispersion of polarization maintaining fiber is measured.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713

【相似文献】