共查询到19条相似文献,搜索用时 109 毫秒
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利用激光脉冲在光纤光栅中传播时所遵守的相干耦合非线性薛定谔方程,研究了激光脉冲在高斯变迹布拉格光纤光栅中传输时,在反常色散区和正常色散区所产生的调制不稳定性.结果表明在反常色散区和正常色散区都能产生调制不稳定性;在反常色散区,当输入功率达到一定数值时,产生明显的有规律的增益谱;在正常色散区,在产生调制不稳定性功率区域,调制不稳定性存在并从给定值一直持续到无穷;并且,在反常色散区和在正常色散区,增益谱都受到高斯变迹函数的制约.
关键词:
高斯变迹
布拉格光栅
调制不稳定性
增益 相似文献
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非均匀光纤光栅响应特性的研究 总被引:12,自引:3,他引:9
光纤栅在未来光纤通信与光纤传感系统中将关键性作用。本文进行了不同线型光栅迹与喃啾 等波导结构参数下的非均匀光纤光栅响应特性的数值计算,并通过对光栅响应不对称性的研究讨论,提出了光栅响应对称性的两个一般条件。 相似文献
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利用均匀相位掩模板制作线性啁啾光纤光栅 总被引:3,自引:1,他引:2
理论上分析并从实验上验证了一种利用均匀相位掩模板写入啁啾光纤光栅的方法:将光纤弯曲,由于光纤离掩模板的距离不同从而使光纤光栅的周期轴向渐变,由此产生啁啾。分析了这种啁啾光纤光栅的谱特性和时延特性,同时也分析了由于光纤离掩模板的距离不同而引起的折射率调制变化给光纤光栅特性带来的影响。设计了一种石英曲面,利用其使光纤按照弯曲函数进行弯曲,然后进行紫外曝光制成了线性的啁啾光纤光栅。实验中制作的啁啾光纤光栅色散值为-1102 ps/nm,纹波为17ps。通过改变弯曲函数就可以实现利用一块均匀相位掩模板制作不同啁啾量的啁啾光纤光栅的目的,降低了啁啾光纤光栅的制作成本。 相似文献
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Asymmetrically apodized linearly chirped fiber Bragg gratings (FBGs) are shown to have highly linearized time-delay response. In simulations of a five-stage, 5-cm grating-based dispersion compensation system, asymmetrically apodized FBGs are shown to give over 60% reduction in the energy scattered from the main pulse body, 16 ps?60 ps pulses propagated over 800 km, as compared to a symmetrically apodized grating of similar length, strength, and bandwidth. 相似文献
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Abstract This article presents a theoretical study of the dispersion properties of the asymmetrically apodized fiber Bragg gratings. It is shown that the dispersive behavior of these gratings may be changed from normal to anomalous, depending on the apodization function and the grating strength. The asymmetrical Bessel functions were chosen in order to demonstrate these properties of the gratings. The application of this effect in a dispersion-less Fabry-Pérot fiber cavity formed by two asymmetrically apodized fiber Bragg gratings is discussed. 相似文献
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SHU Xuewen SHI Wei JIANG Shan HUANG Dexiu 《Chinese Journal of Lasers》2000,9(4):319-324
1 Introduction Fibergratingsareprovedtobeoneofthemostimportantrecentdevelopmentsinthefieldofopticalfibertelecommunicationsandsensing .Theyarelikelytohaveapplicationintwomainareas:dispersioncompensationinlong haulfibernetworks[1,2 ]andwavelengthroutinginw… 相似文献
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This paper presents an overview of fiber Bragg gratings (FBGs) fabrication principles and applications with emphasis on the
chirped FBG used for dispersion compensation in high-speed optical communication systems. We discuss the range of FBG parameters
enabled by current fabrication methods, as well as the relation between the accuracy of FBG parameters and the performance
of FBG-based dispersion compensators. We describe the theory of the group delay ripple (GDR) generated by apodized chirped
fiber gratings using the analogy between noisy gratings and superstructure Bragg gratings. This analysis predicts the fundamental
cutoff of the high frequency spatial noise of grating parameters in excellent agreement with the experimental data. We review
the iterative GDR correction technique, which further improves the FBG quality and potentially enables consistent fabrication
of FBG-based dispersion compensators and tunable dispersion compensators with unprecedented performance. 相似文献
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We demonstrate a high-resolution technique to measure the optical magnitude and phase responses of fiber gratings. The technique employs single-sideband modulation of an optical source and has spectral resolution in the hertz regime. The technique is demonstrated by measurement of the phase ripples of unapodized and apodized chirped gratings as well as the transmission spectrum of a pi-phase-shifted grating. Although it is demonstrated on fiber gratings, the technique is applicable to any optical device. 相似文献
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To model chirped fiber Bragg gratings (FBGs) for dispersion compensation in optical fibers a novel method of single expression
(MSE) is used. The reformulation of Helmholtz’s equation in the MSE to the full set of first-order differential equations
leads to dealing with the electric field amplitude, its derivative, power flow density and phase distributions in any aperiodic
media. The phase derivative obtained numerically permits to compute the dispersion slope in the time delay of investigated
chirped gratings. Reflective and time delay spectra of linearly chirped gratings of different lengths and chirp coefficients
are computed. A self-similarity law for the gratings of the same strength but different lengths and chirp coefficients is
revealed. The apodization of gratings is applied to reduce sidelobes in gratings’ reflection spectra and eliminate oscillations
in the time delay characteristics. 相似文献
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To model chirped fiber Bragg gratings (FBGs) for dispersion compensation in optical fibers a novel method of single expression (MSE) is used. The reformulation of Helmholtz's equation in the MSE to the full set of first-order differential equations leads to dealing with the electric field amplitude, its derivative, power flow density and phase distributions in any aperiodic media. The phase derivative obtained numerically permits to compute the dispersion slope in the time delay of investigated chirped gratings. Reflective and time delay spectra of linearly chirped gratings of different lengths and chirp coefficients are computed. A self-similarity law for the gratings of the same strength but different lengths and chirp coefficients is revealed. The apodization of gratings is applied to reduce sidelobes in gratings' reflection spectra and eliminate oscillations in the time delay characteristics. 相似文献