共查询到20条相似文献,搜索用时 93 毫秒
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取样光纤Bragg光栅特性的数值模拟分析 总被引:1,自引:0,他引:1
文章应用传输矩阵法对取样光纤布拉格光栅(SFBG)的反射谱进行了数值模拟,并分析了折射率调制幅度、占空比、取样周期和光栅长度等光栅参数对其反射谱的影响,在此基础上用切趾函数对其进行旁瓣干扰处理,得到了较为理想的8通道SFBG反射谱. 相似文献
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用于色散补偿的线性啁啾光纤光栅的最佳切趾包络函数的研究 总被引:3,自引:0,他引:3
具有切践包络的的线性啁啾光纤光栅是用于色散补偿的重要源器件。通过切趾的方法可以减少啁啾光纤光栅内的时延振荡,同时减小反射谱中的瓣。用数值方法分析了不同切趾包络函数对光栅特性的影响,得到了色散补偿最佳包络函数及其参数,给出了最佳包络的普遍特征。 相似文献
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蒲会兰 《光纤与电缆及其应用技术》2008,(5)
基于耦合模理论,运用传输矩阵法对取样光栅的反射谱进行了数值计算,着重分析了光栅长度、占空比及光栅取样周期对取样光栅反射谱的影响规律,基于特性分析讨论了取样光栅在光纤系统中的应用,为以后具体应用提供了理论指导和参考. 相似文献
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对称切趾啁啾光纤光栅能够抑制反射旁瓣、平滑群时延曲线,但反射谱带宽利用率低.与对称切趾相比,非对称切趾光栅在保持群时延曲线基本不变的前提下,反射谱3 dB带宽提高了64.08%,同时群时延纹波振荡也得到了一定的抑制.利用升余弦函数对光栅的长波长端和短波长端进行了不同比例的切趾仿真,发现长波长端30%切趾、短波长端20%切趾能够有效地提高光栅的反射带宽,同时可将群时延纹波压低在±2 ps之内. 相似文献
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光纤光栅最佳切趾函数的研究 总被引:6,自引:2,他引:4
采用耦合模理论,给出了用传输矩阵法计算光纤Bragg光栅(FBG)特性的方法,进而得到了在不同切趾函数形式下的FBG反射谱的数值解。通过理论分析,给出了最佳切趾函数反射谱和群时延特性曲线。 相似文献
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Xiaoying He Yonglin Yu Dexiu Huang Ruikang Zhang Wen Liu Shan Jiang 《Lightwave Technology, Journal of》2008,26(6):720-728
In this paper, an analytical method is proposed for calculating reflection-spectrum envelopes (RSEs) of various multipeak gratings. Consequently, impacts of parameters on the envelope of the sampled grating are analyzed in detail both with and without refractive index variation. Accuracy of those proposed methods has been verified by the good agreement with the simulated reflectivity spectrum of the transfer matrix method. A technology of multiple reflection spectrum envelopes concatenation (MRSEC) is proposed to design multipeak gratings with broad flat-top spectrum envelopes: one is the digital concatenated grating; the other is the consecutive interleaved sampled grating. The proposed technology can densify spectral channels of sampled gratings with fixed reflectivity peak space, as well as spatially physical corrugation of structure. 相似文献
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Efficient technique for increasing the channel density in multiwavelength sampled fiber Bragg grating filters 总被引:3,自引:0,他引:3
Chinhua Wang J. Azana L.R. Chen 《Photonics Technology Letters, IEEE》2004,16(8):1867-1869
We introduce a new class of high channel count multiwavelength comb filters based on sampled fiber Bragg gratings (FBGs). Our approach exploits the spectral fractional Talbot effect in sampled chirped FBGs (S-CFBGs). For specific conditions between the grating chirp and sampling period, the channel spacing can be reduced compared to the value obtained using conventional sampling techniques. In this way, the channel density can be multiplied without needing to increase the sampling period. Moreover, despite the fact that the grating is chirped, operating under the spectral Talbot regime ensures that the resultant in-band group delay characteristics are similar to those of a sampled uniform period FBG. 相似文献
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Frank Knappe Hagen Renner Ernst Brinkmeyer 《AEUE-International Journal of Electronics and Communications》2008,62(7):513-520
A simple and fast numerical procedure is presented for designing spatially symmetric Bragg gratings with no need for iteratively solving the coupled mode equations. Using a unique relation between the phase and the amplitude of the reflection spectra valid for spatially symmetric gratings, the grating spectra are suitably optimized to fit given specifications. At the end of the design process an inverse-scattering algorithm determines the spatial structure of the corresponding Bragg grating. This method is particularly useful for the design of add/drop multiplexers, where symmetry can be a crucial prerequisite. 相似文献
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《半导体光子学与技术》2010,(4):146-149,166
In this paper, the reflective spectra of a refraction index sensor were analyzed based on fiber grating F-P cavity. The sensor was constituted by two identical fiber gratings. Compared with the refraction index sensor using one fiber grating, the fiber grating F-P cavity sensor has narrower resonant peak and it can be used for more accurate measurement. The resonant peaks in the reflective spectra of the sensor are changed with small changes of the refraction index of the measured chemical liquids or cell samples. So it has potential applications in biology and chemistry. 相似文献
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用遗传算法从时延特性重构光纤光栅参数 总被引:2,自引:1,他引:2
提出了采用遗传算法(GA)结合传输矩阵法从需要的时延特性对光纤光栅进行参数重构的方法。该方法以时延为目标函数,由光纤光栅参数,包括光栅长度、折射率调制、光栅周期和光栅啁啾,组成种群中的待优化的个体,经过若干代遗传得到最优结果。用实值编码遗传算法实现了对均匀光纤光栅、啁啾光纤光栅和切趾啁啾光纤光栅参数的重构。数值仿真结果表明该方法对光纤光栅的时延特性参数重构十分有效。由斜率为100ps/nm,最大时延为300ps,中心波长为1555.2nm的理想线性时延特性重构出切趾啁啾光纤光栅的参数。此方法可以有效地从时延信息中提取光纤光栅参数,能够应用在利用光纤光栅时延特性的光控相控阵天线设计中。 相似文献
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本文应用微电子制板技术、电子束扫描曝光和离子刻蚀技术研制成功微米、亚微米级宽度的矩形光栅结构,并对其进行了衍射特性的研究。实验测试数据表明了当光栅的周期接近使用的照明光的波长时,具有明显的矢时衍射特性。 相似文献
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A comb optical filter based on the spectral Talbot effect in uniform low reflecting fibre Bragg gratings is numerically and experimentally demonstrated, relaxing the need for any chirp or equivalent phase shifts between the gratings. It can be understood by the analogy between the compression and rate multiplication of phase modulated pulse trains and sampled fibre Bragg grating spectrum formation 相似文献