共查询到19条相似文献,搜索用时 571 毫秒
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本文扼要评述Chirp光纤光栅的光学特性,包括耦合波方程,反射谱和时延特性,对几种主要紫外写入Chirp光纤光栅的技术进行了全面的评价,最后介绍了chirp光纤光栅在光通信和激光等方面的重要应用。 相似文献
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根据耦合模理论及模耦合方程推导了长周期光纤光栅的透射系数,反射比以及级联长周期光纤光栅的透射系数表达式,用Matlab对其进行仿真研究,并总结了长周期光纤光栅透射谱特性随光栅长度、周期及耦合系数的变化规律,通过仿真实验,验证了系统特性. 相似文献
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研究了正十边形对称结构光子晶体光纤布拉格光栅(PCFBG)特性,分析了不同空气孔层数以及不同占空比对布拉格光栅反射谱的影响.在此基础上,对正十边形光子晶体光纤光栅的传感特性进行了研究.研究表明:随着温度的增加,该光纤光栅的反射谱谐振波长明显向长波方向偏移;随着应力的改变,光纤光栅的反射谱谐振波长变化趋势不明显.该光栅具有对温度敏感,对应变不敏感的特点.这种空气孔排列为正十边形对称结构的光子晶体光纤光栅有望应用在光子晶体光纤光栅的传感领域中. 相似文献
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斜平面界面型光纤活动连接中的无反射设计 总被引:1,自引:0,他引:1
应用散射矩阵方法,分析了光纤活动连接中的无反射条件,为光纤无反射连接的实现提供理论依据,并求得了相应问题的另一极端——全反射连接的全部解 相似文献
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Multi-watt oscillation of a Yb/sup 3+/-doped silica fibre pump laser is demonstrated at two wavelengths when pump-coupled Raman fibre laser resonators are constructed using fibre end reflection and a dielectric mirror, which are common to both the pump and Raman fibre lasers. Using an off-resonant Bragg grating to force the initial oscillation of the Raman fibre laser, pump emission at the anti-Stokes wavelength is demonstrated. 相似文献
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A fibre-optic ring resonator with highly wavelength-selective input reflection coefficient was realised by introducing a small local reflection in the ring. The influence of the local reflectivity on the input reflection coefficient is demonstrated. Maximum values for the input reflectivity and finesse are 55% and 10, respectively, using a fibre directional coupler (FDC) with a coupling ratio of 30%/70%. 相似文献
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Ways of coupling directly to a monomode fibre by neutralising the end reflection from the laser and then using the face of the fibre core as a cavity mirror are proposed. The condition is derived for the optimum transfer of power from the laser resonator to the fibre transmission line. 相似文献
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Optical feedback effects on spectral properties of an AlGaAs semiconductor laser weakly coupled to a single-mode fibre resonator with a Fabry-Perot transmission bandwidth of 15 MHz are reported. FM noise spectrum, linewidth and resonator output measurements are found to be in good agreement with theory. 相似文献
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偏振光在冰水混合云中的传输特性 总被引:1,自引:0,他引:1
根据米氏理论,分别计算了由纯水、纯冰和冰-水同心球形粒子构成的平面平行、各向同性云层的单次散射特性(单次散射反照率、不对称因子以及单次散射相矩阵).根据辐射传输理论,利用累加法求解了矢量辐射传输方程,得到了3种不同构成云层的多次散射矩阵,对不同波长的太阳光的反射特性进行了比较.结果表明,反射光的偏振度比强度对云层的微观... 相似文献
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Titanium foils for use in photoelectrochemical devices are treated with a HNO3‐HF solution. After this treatment, the optical reflection characteristics of the Ti substrates are markedly increased in terms of not only reflectivity but also optimized wavelength. Furthermore, the “multiple beam interference” theory and optical analysis of surface morphologies clearly verify the origin of the optimized optical reflection properties. 相似文献
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本文对光纤接头的菲涅尔反应损耗进行了理论分析,并通过实验得出与理论基本一致的结论,最后讨论了光纤接头的菲涅尔反射对传输特性的影响。 相似文献
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Evaluation of reflection effects on semiconductor laser transmitters is complicated by multipath interference, which causes degradations in bit-error-rate and is independent of laser isolation. The authors have constructed a variable back-reflector utilising optical fibre up-tapers, which eliminates multipath interference effects by reducing spurious reflection levels to below -50 dB. Reflection levels of -50 dB to -16.5 dB into the laser cavity are possible. Results of measurements of reflection effects on several multilongitudinal mode 1.3 μm lasers operating at 1.7 Gbit/s are shown 相似文献