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色散平坦渐减光纤中色散特性对超连续谱的影响 总被引:2,自引:2,他引:0
从频域全场方程出发研究了色散平坦渐减光纤中超连续谱(SC)的产生。结果表明,色散平坦渐减光纤的初始色散和色散斜率对超连续谱的产生有重要影响,当超连续谱宽度小于某一特定阈值时,谱宽随初始色散或色散斜率显著变化;而当超连续谱谱宽大于此值以后,谱宽随这两个参量的变化较缓慢。并且发现色散递减曲线为凸型的光纤比色散线性递减的光纤更有利于产生宽的超连续谱;而色散递减曲线为凹型的光纤不利于形成宽的超连续谱。计算表明经过优化选择光纤的色散参量,可以得到谱宽达330nm的超连续谱。 相似文献
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A Fully Vectorial Effective Index Method for Accurate Dispersion Calculation of Photonic Crystal Fibres 下载免费PDF全文
A fully vectorial effective index method is developed for accurate dispersion calculation of photonic crystal fibres (PCFs). In order to improve the accuracy of the model, different values for the effective core radius are used when PCFs have different fibre parameters. The accuracy of our approach is demonstrated by comparing our results with other numerical and experimental results reported in literature. It is found that the accuracy of the fully vectorial effective index method is improved and our results agree well with accurate numerical results obtained by other methods as well as the previously reported experimental data. 相似文献
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A novel microstructure fiber (MF) structure is proposed for broadband dispersion compensation. Through manipulating the four air-hole parameters and the pitch, the broad band dispersion compensation MF can be efficiently designed. The newly designed MF could compensate (to within 0.8%) the dispersion of 101 times of its length of standard single mode fiber over the entire 100-nm band centered on 1550 nm. The proposed design has been simulated through the finite difference beam propagation method, and the corresponding design procedures are also presented. 相似文献
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Flat Supercontinuum Generation at 1550 nm in a Dispersion-Flattened Microstructure Fibre Using Picosecond Pulse 下载免费PDF全文
The generation of a flat supercontinuum of over 80nm in the 1550nm region by injecting 1.6ps 10 GHz repetition rate optical pulses into an 80-m-long dispersion-flattened microstructure fibre is demonstrated. The fibre has small normal dispersion with a variation smaller than 1.5 (ps·nm^-1·km^-1) between 1500 and 1650nm. The generated supercontinuum ranging from 1513 to 1591 nm has the flatness of ±1.5 dB and it is not so flat in the range of several nanometres around the pump wavelength 1552nm. Numerical simulation is also used to study the effect of optical loss, fibre parameters and pumping conditions on supercontinuum generation in the dispersion-flattened microstructure fibre, and can be used for further optimization to generate flat broad spectra. 相似文献
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数值求解了光子晶体光纤中的去极化型声波导布里渊散射色散方程,研究了光子晶体光纤中的布里渊频移随泵浦波长及空气孔填充率的变化关系,以及去极化型声波导布里渊散射频移随温度、应变、声波导模式、纤芯直径及空气孔层数的关系。结果表明:布里渊频移随着波长的增大而线性减小。对于相同的波长点,增大光子晶体光纤空气孔填充率时,声波横向速度将会减小。去极化型声波导布里渊散射频移随温度及应变的增大而线性增加。同一温度条件下,高阶TR2m模式的去极化型声波导布里渊散射频移对温度的变化更为敏感;而在同一应变条件下,低阶TR2m模式的去极化型声波导布里渊散射频移对应变的变化更为敏感。去极化型声波导布里渊散射频移随纤芯直径的增加而增大,随空气孔层数的增加而减小。 相似文献
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基于非线性薛定谔方程,数值研究了色散平坦渐减光纤中非线性啁啾脉冲的传输及超连续谱的产生。研究结果表明,初始啁啾对脉冲传输及超连续谱产生的影响与泵浦条件和光纤参量的选取有很大关系。当色散平坦渐减光纤具有小的归一化二次色散系数时,适当的正啁啾能显著增强超连续谱的带宽,而负啁啾和太大的正啁啾抑制超连续谱的带宽。能增强超连续谱带宽的正啁啾有一个较宽的范围,但随着输入脉冲孤子阶数的降低,该范围将变窄。当色散平坦渐减光纤具有大的归一化二次色散系数同时输入脉冲为低阶孤子时,初始啁啾对超连续谱带宽的增强效果不明显,初始啁啾接近为0时可产生最宽的超连续谱。 相似文献
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色散平坦渐减光纤中超连续谱的产生 总被引:2,自引:1,他引:1
对双正交偏振光脉冲在色散平坦渐减光纤中传输时超连续谱的产生进行了计算和分析。结果表明,由于交叉相位调制效应的作用,双光脉冲可以产生比单光脉冲明显展宽且更为平坦的超连续谱。对于双基孤子脉冲,可以得到-20dB谱宽达388nm的平坦宽带超连续谱,比单基孤子脉冲产生的超连续谱谱宽增加72nm,交叉相位调制效应对超连续谱的产生起到增强的效果。当输入脉冲的抽运功率较低时,交叉相位调制效应对超连续谱的产生的增强效果更为显著,它极大地提高了超连续谱的产生的效率。数值计算的结果还表明,与其他高阶非线性效应相比,拉曼自频率移效应对超连续谱产生的影响更为明显。 相似文献
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