啁啾Bragg光栅的时延、色散特性和分段变迹

发布时间：2018-01-13 10:04

本文关键词：啁啾Bragg光栅的时延、色散特性和分段变迹　出处：《激光杂志》2017年10期 　论文类型：期刊论文

【摘要】：针对啁啾Bragg光栅存在的时延线性度差,色散曲线不够平稳等问题,首先从耦合模理论出发,研究折射率调制深度Δn、光栅长度L、啁啾系数C等重要参数对其时延、色散特性的影响,深入探讨参数与特性的关系。提出分段变迹优化方法,探寻了有效的变迹函数和变迹比例。数值分析表明,Δn从10~(-5)到10~(-3),L从5到100mm变化时,时延和色散振荡幅度都逐渐变大,零色散波长都向长波长方向漂移,最大时延差分别为1080、2784ps,时延线性区域逐渐增大,3dB带宽分别从0.75到2.17nm,0.73到1.04nm。C从0.01到0.2nm/cm变化时,时延振荡幅度和线性部分斜率减小,最大时延差明显减小,线性区域增大,带宽从0.18增大到1.52nm。分段变迹优化后时延线性区域增大,色散曲线更平稳,且有效降低了带宽的压缩程度。
[Abstract]:In order to solve the problems such as the difference of delay linearity and the unsteady dispersion curve of chirped Bragg grating, the depth of refractive index modulation 螖 n and the length of grating L are studied based on the coupled mode theory. The influence of important parameters such as chirp coefficient C on the time delay and dispersion characteristics is discussed. The relationship between the parameters and the characteristics is discussed. A piecewise optimization method is proposed to find out the effective apodization function and the proportion of the changes. The numerical analysis shows that. When 螖 n varies from 10 ~ 10 ~ (-5) to 10 ~ 100 mm, the time delay and dispersion oscillation amplitude increase gradually, and the zero dispersion wavelength drifts towards the long wavelength direction. The maximum delay difference is 1080,2784ps.The linear range of delay increases by 3dB from 0.75 to 2.17nm, respectively. When 0.73 ~ 1.04nm.C varies from 0.01 to 0.2 nm / cm, the amplitude of delay oscillation and the linear partial slope decrease, the maximum delay difference decreases obviously and the linear region increases. The bandwidth is increased from 0.18 to 1.52nm. the linear region of delay increases and the dispersion curve becomes more stable after the optimization of piecewise apodization, and the compression degree of bandwidth is reduced effectively.
【作者单位】：安徽工程大学电气工程学院电气传动与控制安徽省重点实验室;
【基金】：安徽省高等学校自然科学研究项目(KZ00216024) 安徽省高等学校优秀青年人才基金资助项目(2012SQRL219)
【分类号】：TN256
【正文快照】： 啁啾Bragg光栅是一种重要的无源光器件,在光通信和传感技术中得到广泛应用[1]。作为啁啾Bragg光栅的重要参数,折射率调制深度、光栅长度、啁啾系数等对其反射谱、时延、色散等特性影响较大[2]。研究时延和色散特性对色散补偿等实际应用有着重要的意义。文献[3-9]分别对光纤光

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