共查询到20条相似文献,搜索用时 109 毫秒
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根据超短光脉冲在光纤中传输的非线性薛定谔方程,模拟了不同色散参量情况下色散补偿和色散位移光纤对增益开关半导体激光器产生的光脉冲的压缩,给出了光脉冲在经过色散补偿光纤前后的啁啾曲线。结果表明,使用色散参量D分别为-150,-180和-20ps/(nm·km)的色散补偿光纤可以实现其他脉冲压缩方法的压缩效果,最大压缩因子达到6.09,但色散参量越大,所需光纤长度就越短。此外,脉冲经过色散补偿光纤后线性啁啾几乎为零。还利用色散位移光纤对脉冲进行孤子压缩,脉冲宽度由最初的45ps减小到1.23ps。指出采用这2种光纤相结合的方法可以对光脉冲实现高效压缩。 相似文献
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色散缓变光纤中飞秒孤子压缩与稳定传输 总被引:4,自引:1,他引:3
运用数值方法研究了色散缓变光纤中飞秒基本孤子的传输特性,发现基本孤子脉冲不仅能被压缩,而且压缩光脉冲能保持脉宽不变转输即稳定传。光脉冲压缩过程中,发现三阶色散效应有较大的影响。适当地选取色散缓变光纤结构参数可能获得高质量的超短压缩光脉冲。对压缩光脉冲稳定伟机理探索表明,光纤二阶色散纵向变化率,三阶色散与喇曼自散射效应共同作用导致压缩光脉冲稳定传输。 相似文献
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用一种新提出的通用非线性光脉冲传输的量子理论,我们研究了具有啁啾的光脉冲在正色散克尔介质中传输时的压缩比变化情况,数值结果表明,正色散克尔介质中,光脉冲还是压缩态,但压缩和负色散克尔介质比起来弱一点,初始的负啁啾有利于压缩。 相似文献
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利用相位共轭与色散配置实现具有大占空比和大放大器间隔的长距离光孤… 总被引:2,自引:0,他引:2
在用光纤放大器补偿损耗的光纤传输线中,用负色散光纤与正色散光纤或色散补偿器件交叉配置,并使传输线中光纤的有效色散适当大于理论值,同时在传输线中周地使用相位共轭器,可以在把放大器间隔提高到与常规光纤通信相同的条件下有效地削弱孤子之间的互作用。本文对实现速率为25Gbit/s,占空比为1/2,光放大器间隔为100km、传输距离大于6000km的光孤子传输作出了数值论证。 相似文献
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利用半导体激光器的单模速率方程及超短光脉冲在光纤中传输的非线性薛定谔(NLS)方程,从理论及实验上研究了增益开关DFB半导体激光器出射的啁啾光脉冲在色散补偿光纤(DCF)及色散位移光纤(DSF)中的压缩过程与规律.实验上,从1.55μm增益开关DFB半导体激光器出射的重复频率为2.5GHz、脉冲宽度为53.8ps的光脉冲经色散补偿光纤压缩至12ps,而后利用色散位移光纤中的高阶孤子压缩效应将脉冲压缩至2.5ps.改变色散位移光纤参数及入射光功率后获得最窄光脉冲宽度为2.1ps.理论与实验结果符合.
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各向异性内包层对双包层光纤特性影响的分析 总被引:2,自引:2,他引:0
提出了单轴各向异性材料为内包层,且其主轴沿光纤轴线(z轴)方向的双包层光纤模型,推出了矢量模特征方程,重点研究了主轴折射率比kcl对波导色散的影响,针对从矢量模特征方程求解波导色散因表达式极为复杂而无法直接求解的困难,提出了一种求解波导色散的有效方法,研究结果发现可以在不改变光波导结构参量的条件下,通过改变kcl可有效地改变光纤的波导色散,也分析了kcl、几何参量S、光学参量R对低次模的传输和截止特性的影响。研究结果为获得更为理想的色散补偿、色散平坦光纤及设计新型无源光器件提供了重要的依据。 相似文献
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利用相位共轭与色散配置实现具有大占空比和大放大器间隔的长距离光孤子传输 总被引:2,自引:1,他引:1
在用光纤放大器补偿损耗的光纤传输线中,用负色散光纤与正色散光纤或色散补偿器件交叉配置,并使传输线中光纤的有效色散适当大于(与平均孤子对应的)理论值,同时在传输线中周期地使用相位共轭器,可以在把放大器间隔提高到与常规光纤通信相同的条件下有效地削弱孤子之间的互作用。本文对实现速率为25Gbit/s、占空比为1/2、光放大器间隔为100km、传输距离大于6000km的光孤子传输作出了数值论证 相似文献
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光的色散知识是讲授光的干涉和衍射的基础,做好光的色散的演示是教学中的重要步骤,因为它既是为学生提供了学习理论的事实根据,使学生获得感性知识,又是通过介绍牛顿研究光的色散的实验,使学生从中了解科学家如何用观察和实验来研究物理现象的科学思想方法。本文,试就如何做好光的色散演示谈些肤浅的体会。 相似文献
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Takaaki Kakitsuka Shinji Matsuo Seok–Hwan Jeong Toru Segawa Hiroshi Okamoto Yoshihiro Kawaguchi Yasuhiro Kondo Yuzo Yoshikuni Hiroyuki Suzuki 《Optical and Quantum Electronics》2006,38(12-14):1053-1060
We theoretically investigated a digitally tunable laser with a chirped ladder filter and a ring resonator to obtain a wide wavelength tuning range covering the whole C- or L- band. The clear relation between the tuning range and laser structure, especially the ladder filter, is described analytically. The introduction of a chirped structure into a ladder filter is effective in achieving both wide tunability and a stable lasing mode. A numerical simulation based on multimode rate equations shows that a tuning range of over 40 nm and a mode suppression ratio over 40 dB can be achieved by introducing a chirped ladder filter. 相似文献
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研制了一种小型多功能CO2激光器。该激光器可以单脉冲、重频或连续方式输出,并可实现输出脉冲频率的编码及波长调谐。激光器谐振腔采用光栅一级振荡,零级输出的工作方式,分别利用声光调Q技术和脉冲放电技术实现了百ns至亚ms量级的脉冲激光输出。详细介绍了该激光器中基于光学角反射器原理设计的光栅调谐定向输出装置,并对其进行了理论计算和论证,实现了不同波长激光的定向、定位输出,获得调谐激光输出谱线超过60条,谱线分辨率优于0.01μm。激光器脉冲重复频率1Hz~10KHz连续可调,输出波长调谐范围9.2μm~10.8μm,激光器连续输出最大功率8W,重复频率1KHz时最小激光脉宽180ns,峰值功率4062W。该激光器在激光与物质相互作用科学领域,特别是激光对物质作用与破坏机理的研究方面具有重要的应用价值。 相似文献
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ZHAO YanYing WANG Peng ZHANG Wei TIAN JinRong* & WEI ZhiYi Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sci- ences Beijing China College of Applied Science Beijing University of Technology Beijing China 《中国科学G辑(英文版)》2007,50(3):261-266
A compact femtosecond Ti:sapphire laser resonator consisting of three chirped mirrors and one output coupler was designed. By accurately balancing the intra- cavity dispersions between Ti:sapphire crystal, air and chirped mirrors, we directly generated the laser pulse shorter than 7 fs at the average power of 340 mW with 3.1 W pump. The repetition rate of the laser oscillator is 173 MHz at the centre wavelength of 791 nm, and the ultrabroaden spectrum covers from 600 nm to 1000 nm. To the best of our knowledge, this is the simplest laser resonator capable of generating sub-10 fs laser pulse. 相似文献
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We demonstrate, both numerically and experimentally, adiabatic soliton spectral compression in a dispersion-increasing fiber (DIF). We show that a positively chirped pulse provides better spectral compression in a DIF with a large anomalous dispersion ramp. An experimental spectral compression ratio of 15.5 is obtained using 350 fs positively chirped input pulse centered at 1.5 μm. A 30 nm wavelength tuning ability is experimentally achieved. 相似文献
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Xiaohong Zhou Xiaorong Gao Li Wang Zeyong Wang Bin Luo Jinlong Li 《Optics & Laser Technology》2012,44(7):2120-2124
In chirped pulse amplification, the amplification of an optical pulse in laser amplifying medium is a very important link. After considering dispersion, Kerr nonlinear effect, gain distribution and loss of the medium, the physical model that the optical pulse propagates in the medium has been established, which is suitable for the general situation where the optical pulse propagates in the amplifying medium. Using a split-step Fourier method, the propagation state of a chirped optical pulse in the amplifying medium has been numerically simulated, and the influences of the gain dispersion of the medium and the frequency detuning of the pulse on the optical pulse have been discussed emphatically. The results show that, with the amplification and propagation of the ultrashort chirped pulse in the amplifying medium, gain saturation and Kerr nonlinear effect of the medium will cause distortion of the optical pulse. For the optical pulse with a wideband spectrum, gain dispersion will cause the gain narrowing effect, so it is equivalent to a loss mechanism. The frequency detuning of the optical pulse will cause distortion of the pulse, which can be used to weaken the impact of gain saturation, thus reshaping the optical pulse. 相似文献
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Evanescent field perturbation of an integrated microring resonator is examined as a means of achieving high-fidelity reversible tuning of photonic microcavities over large wavelength ranges. A 1.7% wavelength tuning is achieved through the use of a novel silica fiber probe that provides access to the evanescent field of an air-clad high-index-contrast ring resonator. As the microring is perturbed, the probe-ring distance is found through simultaneous nanometric distance calibration and force measurements. Experimental results agree well with theoretical tuning. Possible microelectromechanical systems implementation of this effect is discussed, as well as avenues for improvement of the tuning range. 相似文献