共查询到16条相似文献,搜索用时 250 毫秒
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为了探讨超短光脉冲在分布式光纤放大器中的传输放大特性及影响因素,建立了光脉冲在光纤放大器中的基本传输方程,以掺镱光纤放大器为例,采用分步傅里叶变换法对放大器中光脉冲的演变进行了模拟,讨论了初始啁啾和增益色散的影响。结果表明,当光脉冲在分布式光纤放大器中传输时,光纤的色散、非线性效应均会影响脉冲的形状和频谱,光脉冲初始啁啾也会对脉冲的传输状态产生影响;对于宽频谱光脉冲,增益色散相当于一种损耗机制,应该考虑其影响。相关结果对光纤放大器的系统设计和优化具有一定的参考价值。 相似文献
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无初始啁啾高斯光脉冲的色散展宽及色散补偿 总被引:9,自引:1,他引:8
对无初始啁啾高斯脉冲在普通单模光纤中的传输特性及线性啁啾光纤光栅的色散补偿特性进行了理论分析和数值模拟。结果表明,光纤的色散导致了传输脉冲的展宽,线性啁啾光纤光栅能够实现对展宽脉冲的良好补偿,啁啾光栅时延曲线的平滑度和线性度都是影响其色散补偿性能的重要因素。本文对啁啾光纤光栅的制作及其在色散补偿中的应用有一定的指导意义。 相似文献
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初始啁啾对高斯脉冲形成光孤子的影响 总被引:3,自引:0,他引:3
本文通过解薛定谔方程分别研究了线性光纤中色散导致具有初始频率啁啾的高斯脉冲展宽的详细物理过程和非线性光纤中自相位调制导致光脉冲频谱展宽的详细物理过程 ,得到高斯脉冲在光纤中群速度色散所导致的频率啁啾在反常色散区是下啁啾 (负啁啾 ) ,与脉宽的关系是线性的 ,自相位调制所产生的频率啁啾是上啁啾 (正啁啾 ) ,在脉冲的中心部分近似为线性 ,当CPβ2 <0时 ,脉冲有一个初始窄化的阶段等结论。最后用计算机模拟光孤子传输估算出形成孤子的初始啁啾范围值。 相似文献
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本文从激光脉冲在单模光纤中传输所满足的非线性薛定谔方程出发,通过分步傅里叶变换方法,数值研究了超高斯啁啾光脉冲在单模光纤中脉冲形状的演化.研究表明,超高斯脉冲在单模光纤中传输将经历一个从近平顶、多峰、最后到单峰的演变过程,且高阶色散将引起脉冲形状发生畸变;在GVD和SPM效应的共同作用下,无啁啾的超高斯脉冲在特定条件下将出现孤子演变,具有正啁啾的超高斯脉冲在传输的初始阶段,脉冲形状的变化非常剧烈,而由于负初始啁啾减弱了非线性与色散效应引起的频率啁啾,所以其脉冲波形的变化平缓一些.研究表明,SPM产生的啁啾对入射脉冲的初始啁啾有一定的补偿作用. 相似文献
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光纤放大器中有限增益带宽对自相似脉冲放大演化的数值研究 总被引:1,自引:0,他引:1
通过求解包含超高斯增益系数滤波项的分布增益非线性薛定谔方程,模拟研究了短脉冲在有限增益带宽指数增益光纤放大器中的自相似演化行为及其差异。结果表明脉冲在不同指数增益分布放大器中传输时都会受到增益带宽的限制。相同输入脉冲在相同长度、相同总增益的指数上升、下降和双向分布放大器中放大时,在双向分布放大器中输出能量最高,输出脉冲线性啁啾特性最好,指数下降放大器输出能量最低,输出脉冲线性啁啾特性最差,指数上升放大器居两者之间。另外,总增益相同时,无论是指数上升、下降和双向分布放大器,初始增益系数较小,输出脉冲能量较高,脉冲线性啁啾特性较好。 相似文献
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Tzelepis V. Markatos S. Kalpogiannis S. Sphicopoulos T. Caroubalos C. 《Lightwave Technology, Journal of》1993,11(11):1729-1736
Modeling results are presented for a passively mode-locked figure-eight laser (F8L) supporting a linear polarization state. Starting from amplified spontaneous emission, the model produces soliton, chirped, red-shifted, ultra-short pulses. The self-starting conditions of the laser are investigated, and the erbium-doped fiber amplifier gain threshold to passively mode-lock the laser is determined as a function of the center coupler splitting ratio (Cr). The influence of Cr, as well as the effects of the cavity length (Lc), first- and second-order group velocity dispersion to the F8L operating, parameters, and output pulse characteristics such as width, peak power, chirp, self-frequency shift and envelope distortion, are studied 相似文献
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Ultralong dispersion-shifted erbium-doped fiber amplifier and itsapplication to soliton transmission
Distributed, dispersion-shifted erbium-doped fiber amplifiers with doping concentrations as low as 0.1-0.5 p.p.m. (0.1-0.5×10-4 wt.%) were fabricated and their grain characteristics studied for the purpose of soliton amplification. A 9.4-km dual-shape-core-type amplifier with a 0.5-p.p.m. concentration had a gain of more than 20 dB at 1.535 μm and 10 dB at 1.552 μm with a forward pumping configuration, and it could successfully amplify and transmit a 20-ps soliton pulse train at a 2.5-GHz repetition rate. The soliton transmission characteristics of an 18.2 km long fiber amplifier were studied using backward and forward pumping. It was found that A =1.5 soliton pulses with a pulse width of 20 ps could be amplified over 18.2 km at a repetition rate of 5 GHz, where soliton narrowing to 16 ps was observed 相似文献
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《Photonics Technology Letters, IEEE》1993,5(5):540-543
Interest behavior of the flattened dynamic gain of an erbium-doped fluorozirconate fiber amplifier is demonstrated in a lightwave CATV system including a 50-channel subcarrier multiplexer. Using two analog distributed-feedback (DFB) laser diodes, one with a relatively high chirp and the other with a very low chirp, a comparison between amplifiers made of erbium-doped silica and fluoride fiber demonstrates the significant influence of the laser FM response when the spectral dynamic gain of the amplifier is not constant 相似文献
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We theoretically study the saturation of a homogeneously broadened optical amplifier with a slow response time. This model approximates well the behavior of the erbium-doped fiber amplifier (EDFA). When a broad-band pulse propagates inside such amplifier the saturation is determined by the overlap between the amplifier gain profile and the pulse spectrum rather than by the energy of the pulse. This effect may significantly increase the output power of an EDFA that amplifies broad-band pulses 相似文献
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正常色散光纤放大器中超短脉冲的自相似演化条件 总被引:1,自引:1,他引:1
在正常色散条件下,超短光脉冲在光纤放大器中可以演化成具有线性啁啾的自相似抛物脉冲,其演化结果可影响脉冲的压缩质量.采用分步傅里叶方法数值研究了正常色散光纤放大器中,初始输入脉冲宽度、能量、光纤增益和色散系数对超短脉冲自相似演化结果的影响.发现色散长度是脉冲能否实现自相似演化的关键因素.当色散长度与光纤长度相近(几倍)时,脉冲可以实现自相似演化;两者相差越大,脉冲的自相似演化程度越差.增加初始脉冲能量可以加速脉冲的自相似演化,缩短自相似演化的距离.放大器总增益一定时,增益系数越大,脉冲受非线性扭曲的影响越大,使脉冲的自相似演化结果越差;增益系数为0.95 m-1时放大器可获得的总增益比3.8 m-1时大3.3 dB. 相似文献