共查询到19条相似文献,搜索用时 113 毫秒
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对准连续光在光子晶体光纤中的传输特性进行了理论和实验研究.利用分步傅里叶方法求解非线性薛定谔方程,数值模拟了准连续光在光子晶体光纤中传输时光谱和脉冲的演化,并分析了其非线性机理和光谱展宽机制.通过比较不同条件下脉冲时域和频域的演化过程,发现低功率、宽脉冲条件下引起光谱展宽的主要因素是光纤反常色散区的调制不稳(MI)作用.此外,还分析了脉冲功率、光纤非线性系数、脉冲宽度等因素对光谱展宽的影响.在理论研究基础上,将脉冲宽度为80 ps的准连续光耦合入70 m长的非线性光子晶体光纤,获得了覆盖整个通信波段的超连续(SC)谱,波长范围1300~1700 nm. 相似文献
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短脉冲在色散平坦光纤中传输前后波形、相位和啁啾测量的实验研究 总被引:7,自引:3,他引:7
二次谐波频率分辨光学门(SHG-FROG)是能够准确测量短脉冲多项特性参量的新技术。利用二次谐波频率分辨光学门脉冲分析仪对在色散平坦光纤中传输前后的短脉冲进行了测量,得到了待测光脉冲的频率分辨光学门(FROG)图、自相关曲线、自相关频谱曲线、波形和相位曲线以及脉宽、谱宽、啁啾等反映短脉冲特性的信息,对实验结果进行了分析,并与高斯脉冲在单模光纤中的线性传输理论进行了比较。结果表明,激光器输出的短脉冲是具有负线性啁啾的近变换极限高斯脉冲,经过12.7 km色散平坦光纤传输后仍然为具有负线性啁啾的高斯脉冲,其谱宽在传输过程中基本保持不变,脉宽展宽了3.1倍,啁啾增大了4倍。实验测量结果和理论预期一致。 相似文献
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基于耦合非线性薛定谔方程(CNLSEs),利用分裂步长傅里叶方法(SSFM),研究了超短光脉冲在有源三芯非线性光纤耦合器中的传输和开关特性.重点分析了在一阶色散耦合系数和二阶色散耦合系数的影响下,线性增益系数和有限增益带宽对脉冲传输和开关特性的影响.研究表明,线性增益系数能增大开关陡峭性、降低开关临界能量、提高开关效率;虽然有限增益带宽使耦合器开关特性变差,但是它不仅能显著抑制由线性增益系数引起的脉冲压缩和放大,而且还能有效抑制由一阶色散耦合系数引起的脉冲展宽和分离以及由二阶色散耦合系数引起脉冲高频振荡,使光脉冲在三纤芯间呈现出类似无源光纤耦合器那样的周期性耦合传输特性. 相似文献
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综述了超短光脉冲产生方式;详细阐述了几种典型的产生超短光脉冲的方法,分析了其特点.介绍了一种新型的任意波形光脉冲合成技术,通过对光谱的每个谱线分别进行独立地操控来制作光脉冲的傅立叶合成器,能够产生任意波形的超短光脉冲. 相似文献
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为了研究了自相似脉冲对在色散渐减光纤中的动力学特性,采用非线性薛定谔方程对脉冲对的演化和压缩特性进行了模拟,分析了脉冲对在演化过程中相邻区域产生的相互作用。结果表明,不考虑3阶色散时,脉冲对在自相似演化过程中,相邻的区域将产生对称性的相互振荡,而脉冲其它区域演化不受影响,通过色散补偿可以得到脉宽为128.4fs、压缩因子为7.8的压缩脉冲对;而在考虑3阶色散时,脉冲对的演化将产生畸变,相邻区域的振荡呈现不对称性,通过色散补偿技术,得到脉宽为211.6fs、压缩因子为4.7的压缩脉冲,虽然不对称性振荡使得压缩脉冲出现较明显的基座,但几乎不影响压缩质量。该研究结果对自相似脉冲对的演化的理解具有参考价值。 相似文献
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Dynamic characteristics of double-clad fiber amplifiers for high-power pulse amplification 总被引:5,自引:0,他引:5
Yong Wang Hong Po 《Lightwave Technology, Journal of》2003,21(10):2262-2270
Based on numerical modeling, the dynamic characteristics of high-power ytterbium-doped double-clad fiber amplifiers during the amplification of nanosecond pulses with kilohertz repetition rates are comprehensively analyzed. The temporal pulse energy, power, upper-level population distribution, amplified spontaneous emission, stored energy, pulse waveform evolution, etc., are emphasized in this paper. Some practical issues in amplification processes, such as the impacts of reflected pulses from the external surfaces and the fluctuation of input pulse energy on the amplifier performance, are also discussed. The models and results are important for the design and development of high-power double-clad fiber amplifiers. 相似文献
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Zhiping Jiang Xi-Cheng Zhang 《Quantum Electronics, IEEE Journal of》2000,36(10):1214-1222
The authors report the use of an optoelectronic system for the measurement of terahertz (THz) pulses by using chirped pulse technology. This system measures the spatio-temporal distribution of free-space pulsed radiation with an unprecedented data acquisition-rate. Using a linearly chirped optical probe pulse with an electro-optic crystal, a temporal waveform of a copropagating THz field is linearly encoded onto the frequency spectrum of the optical probe pulse and then decoded by dispersing the probe beam from a grating to a detector array. Acquisition of picosecond THz field pulses without using mechanical time-delay devices have been achieved. A single-shot electro-optic measurement of the temporal waveform of a THz pulse has been demonstrated. Unparalleled by other THz sampling techniques, this single-shot method provides what is believed to be the highest possible data-acquisition rate. Temporal resolution, sensitivity, optimal optical bias point of electro-optic modulation, potential applications, and possible improvements are also discussed. In principle, this technique can also be used in magneto-optic measurements 相似文献
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A simple triangular pulse generator designed for CMOS monolithic implementation is described. The characteristics of the produced triangular pulses are readily user denned and their repetition rate is determined by an externally fed pulse-like waveform. The pulse generator is designed to operate in the frequency range 25-2500 Hz, and produces triangular pulses practically free of voltage spikes. 相似文献
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Yongwoo Park Fangxin Li J. Azana 《Photonics Technology Letters, IEEE》2006,18(17):1798-1800
A simple fiber-based spectral interferometry setup is implemented for characterizing and monitoring the amplitude and phase of ultrafast temporal waveforms generated by optical differentiation with a long-period fiber grating (LPFG). In particular, the system is applied to characterize subpicosecond odd-symmetry Hermite-Gaussian (HG) pulses, consisting of two /spl pi/ phase-shifted temporal lobes, obtained by temporal differentiation of Gaussian-like pulses. This technique is ideally suited for optimizing the experiment conditions (e.g., wavelength shifting between the input pulse and LPFG transmission characteristic) so as to achieve a nearly ideal odd-symmetry HG temporal waveform (with a sharp discrete /spl pi/ phase shift at its center), of potential interest as a higher order soliton in dispersion-managed optical communication systems. 相似文献
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1053 nm掺Yb3+双包层光纤放大器脉冲放大特性研究 总被引:2,自引:1,他引:2
从掺Yb^3+光纤放大器(YDFA)的功率传输方程出发,采用有限差分法对掺Yb^3+双包层光纤放大器在1053nm的脉冲放大特性进行数值分析。模拟计算了在977nm前向抽运下,光纤放大器中的上能级粒子数,抽运光和放大自发辐射(ASE)在光纤中的稳态分布。分析了掺Yb^3+双包层光纤放大器的单脉冲波形畸变以及控制输入脉冲形状来产生需要的超高斯输出脉冲形状。讨论了最佳长度以及抽运方式差别等问题。 相似文献