共查询到19条相似文献,搜索用时 265 毫秒
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基于拉曼放大对色散渐减光纤的绝热压缩效果的优化 总被引:3,自引:0,他引:3
数值研究了光纤损耗对色散渐减光纤中基孤子脉冲的绝热压缩的影响,并分析了利用分布式的拉曼放大来提高DDF的绝热压缩效果的方案.结果表明:光纤损耗严重破坏了DDF对基孤子绝热压缩的效果;采用分布式的拉曼放大能对DDF的绝热压缩起到很好的优化效果,获得更高的压缩因子和脉冲能量;当拉曼增益系数选取优化值0.27/LD时,脉宽为10 ps的基孤子脉冲压缩后可得到脉宽仅417fs、脉冲能量增至5.9倍、峰值功率增至136.3倍、基座能量比仅为2.8%的输出脉冲. 相似文献
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色散渐减光纤中产生优质自相似脉冲的研究 总被引:5,自引:0,他引:5
从非线性薛定萼谔(NLS)方程出发,介绍了色散渐减光纤中抛物线脉冲的自相似传输原理以及输出的自相似脉冲的特性.研究不同的g0(色散增益系数)、不同时域包络的初始输入脉冲、不同的初始脉宽对自相似脉冲产生的影响,利用数值模拟结果对色散渐减光纤中影响自相似脉冲形成的参量进行分析,为在色散渐减光纤中产生高质量自相似脉冲的优化设计提供理论依据,发现输入具有较大g0和T0的双曲正割脉冲可以在较短的光纤长度上就获得高功率、强线性啁啾和宽频谱的抛物线型自相似脉冲,同时对自相似脉冲进行补偿时,所需的补偿光纤长度明显缩小,且可得到80fs量级的高质量压缩脉冲. 相似文献
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综述了基于色散渐减光纤的绝热孤子压缩、高阶孤子压缩和非线性光纤环镜的光脉冲压缩的方法、原理及其进展,介绍了作者最近的研究成果,即采用色散渐减光纤构成的马赫--曾德尔干涉仪压缩光脉冲. 相似文献
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色散渐减光纤环形镜的一种改进方法 总被引:1,自引:3,他引:1
提出了一种由常规光纤和色散渐减光纤构成的新的非线性光纤环形镜(NOLM)。研究了该结构的动力学特性,并与色散渐减光纤(DDF)构成的环形镜进行了比较。数值结果表明,该类型光纤环形镜能产生无基座高品质超短光脉冲,压缩脉冲的啁啾小,在脉冲中心处呈线性,而且获得的脉冲能在无损耗的常规光纤中长距离稳定传输。压缩脉冲的压缩因子和基座能量与输入脉冲的初始脉宽和峰值功率有关,当输入脉冲的宽度增加时,所需的光纤长度变长,压缩因子和基座能量有所下降;当输入功率增加时,所需光纤长度变短,压缩因子和基座能量增加。研究结果还显示,在较大的输入脉冲峰值功率范围内,当脉冲获得最佳压缩时,与色散渐减光纤环形镜相比,新的光纤环形镜所用光纤长度短,压缩因子高。 相似文献
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色散缓变光纤中皮秒啁啾脉冲的孤子效应压缩 总被引:1,自引:1,他引:0
文章从描述皮秒光脉冲在色散缓变光纤(FSDD)中所满足的非线性Schroedinger(NLS)方程出发,数值模拟了高阶皮秒光孤子在不同的FSDD中的孤子效应压缩,并讨论了初始啁啾对其的影响,结果表明,利用FSDD和孤子效应压缩来压缩带有初始啁啾的高阶皮秒光孤子,可以得到更高的压缩比和品质因子,压缩后的脉冲的峰值功率明显提高,而且脉冲被压缩到最窄所需的光纤长度也大大缩短,最后讨论了初始脉宽的影响。 相似文献
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Suzuki K. Iwatsuki K. Nishi S. Samwatari M. Kitoh T. 《Photonics Technology Letters, IEEE》1994,6(3):352-354
0.8 ps TL pulses are successfully generated from a gain-switched DFB-LD by adiabatic soliton compression using a dispersion decreasing fiber (DDF). The compression ratio can be controlled using the peak input power into the DDF. We obtain a 10×2n Gb/s pulse stream by optically multiplexing the compressed pulses with a Mach-Zehnder (MZ) interferometer type multiplexer, in which n can be freely selected from 1 to 4 by controlling the coupling ratios of the couplers in the MZ interferometers. By using the demonstrated techniques, we can multiplex the initial pulse stream up to 160 Gb/s at the noninterfering duty factor of 0.2 相似文献
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Proposed is a novel optical pulse compression technique based on high-doped erbium fiber amplifier and standard single-mode fiber(SMF). We used the amplifier with the erbium ion concentration of 6.3)〈 10^-3 to amplify a hyperbolic secant pulse from a regeneratively mode-locked fiber laser. The central wavelength, pulsewidth and peak power of the pulse are 1 550 nm, 12. 5 ps and 3 mW, respectively. Then the amplified pulse with peak power level corresponding to a higher-order soliton is compressed when it propagates through a 3-km-long single-mode fiber. Studied are the compressed pulses under different pump powers and fiber lengths. The results show that it can get a narrower pulse, and solve the difficulty that pulses at low power can not be compressed directly in the fiber. And the construct is compact. 相似文献
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采用全矢量有限元法和分步傅里叶法模拟计算了高非线性光子晶体光纤在近红外光谱区(特别是在850 nm)的飞秒脉冲孤子效应压缩,提出了一种新的反常群速度色散(2=-50.698 ps2/km)、小高阶色散和高非线性(=268.419 1 W-1/km)二氧化硅芯光子晶体光纤结构,建立了包含高阶色散和拉曼散射的非线性薛定谔方程,研究了高斯脉冲在此光纤中传输时,光纤长度和孤子阶数对脉冲压缩的影响,分析了光纤中2~5阶色散,研究表明:孤子阶数为8时,品质因子和压缩因子均达到最大,初始脉冲的峰值功率P0=3 357.8 W,压缩效果最好;优化光纤几何和光学参数,可以得到了高品质因数、小底座的超短光脉冲。 相似文献
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Ultrashort pulse propagation, pulse breakup, and fundamental soliton formation in a single-mode optical fiber 总被引:1,自引:0,他引:1
The propagation of ultrashort (0.83 ps), intense dye laser pulses through a single-mode optical fiber is investigated. The input wavelength is tuned in the vicinity of the zero dispersion wavelength of the fiber. Although the input power is sufficient to generate solitons of up to the tenth order we do not observe the formation of high-order solitons. Instead, the input pulse breaks up temporally and spectrally after an initial stage of narrowing, and an ultrashort Stokes pulse is formed which shifts continuously to lower frequencies with increasing fiber length. The parameters of this pulse closely correspond to those of the fundamental soliton solution of the nonlinear Schroedinger equation. Using fiber lengths from a few meters up to 1 km the resulting pulse durations lie between 55 and 410 fs and the corresponding wavelengths between 1.36 and 1.54 μm. Numerical simulations solving a modified nonlinear Schroedinger equation including higher order dispersion and the Raman effect are in good agreement with the experimental results. It is shown that the principal soliton pulse shaping mechanisms are pulse narrowing and the soliton self-frequency shift. 相似文献
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Rui Liang Xiaojun Zhou Zhiyao Zhang Zujun Qin Heping Li Yong Liu 《Optical Fiber Technology》2009,15(5-6):438-441
The spectral compression performance of the fundamental soliton in a dispersion-increasing fiber is investigated through numerically solving the generalized nonlinear Schrödinger equation. Based on the calculation results, we detailedly analyze the influence of the input peak power, the fiber length, and the initial chirping on the output pulse, e.g. the spectral width, the spectral width ratio, and the center wavelength. The calculation results show that spectral compression from 12.6 nm to 5.2 nm, can be realized for the soliton with pulse width of 200 fs and center wavelength of 1550 nm propagating in the dispersion-increasing fiber with length of 100 m and the group-velocity dispersion parameter linearly varying from −1 ps2/km to −11 ps2/km. 相似文献
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为了获得高质量的窄线宽光脉冲,采用单模光纤和光子晶体光纤相结合的光谱压缩技术,通过分步傅里叶变换方法求解非线性薛定谔方程,数值模拟了1550nm波段高斯脉冲光谱压缩过程。结果表明,当初始脉冲的脉宽、峰值功率及所采用光子晶体光纤的参量一定时,光谱压缩存在一最佳光子晶体光纤长度;且初始光脉冲的峰值功率越大,所采用光子晶体光纤的非线性系数越大,所需光子晶体光纤最佳长度越短,所得谱压缩比越大;利用最佳长度为4.152m的光子晶体光纤对峰值功率为110W、初始脉宽为0.65ps的高斯脉冲进行光谱压缩时,可得谱压缩比为3.47的最佳谱压缩光脉冲;脉冲形状对光谱压缩产生一定的影响,高斯脉冲较超高斯脉冲光谱压缩效果更好。该研究结果对研制窄线宽、超短脉冲光纤激光器具有指导意义。 相似文献
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Gong-Ru Lin I-Hsiang Chiu 《Photonics Technology Letters, IEEE》2006,18(9):1010-1012
We demonstrate the high-power amplification and single-stage fiber-based pulse compression of a traveling-wave semiconductor optical amplifier (TWSOA) fiber ring laser (SOAFL), which is optically mode-locked by backward injecting the TWSOA with a dark-optical-comb at repetition frequency of 10 GHz. A negatively chirped SOAFL pulsewidth of 5.4 ps is compensated and shortened to 3.9 ps by a 75-m-long dispersion compensating fiber. With a single-stage pulse compression in a single-mode-fiber spool, the SOAFL pulses with input average power of 1.7 W can further be compressed to a pulsewidth of 410 fs, corresponding to a pulse compressing ratio of nearly ten. The maximum average output power of the amplified SOAFL pulse is up to 1.1 W, corresponding to the peak power and pulse energy of >0.27 kW and 110 pJ, respectively. 相似文献