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基于速率方程的离散算法,实现了对双包层Er3 + /Yb3 +光纤放大器动态特性的分析。研究了不同信号和泵浦功率下单信道的瞬态功率、脉冲序列输出功率与增益随时间的变化以及多信道异步转移模式下输出功率和增益随时间的变化。结果表明:对于单个脉冲,在相同的泵浦功率下,输出脉冲的峰值功率取决于输入脉冲的峰值功率;在不同的泵浦功率下,输出脉冲的峰值功率取决于泵浦功率。对于脉冲序列,在达到稳定的输出前,将经历一个输出功率和增益由高到低的变化过程。对于异步转移模式的多信道脉冲,脉冲重叠时的功率和增益变化要快于非重叠时功率和增益的变化。 相似文献
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双包层Er3+/Yb3+共掺光纤放大器动态特性研究 总被引:1,自引:0,他引:1
基于速率方程的离散算法,实现了对双包层Er3+/Yb3+光纤放大器动态特性的分析.研究了不同信号和泵浦功率下单信道的瞬态功率、脉冲序列输出功率与增益随时间的变化以及多信道异步转移模式下输出功率和增益随时间的变化.结果表明对于单个脉冲,在相同的泵浦功率下,输出脉冲的峰值功率取决于输入脉冲的峰值功率;在不同的泵浦功率下,输出脉冲的峰值功率取决于泵浦功率.对于脉冲序列,在达到稳定的输出前,将经历一个输出功率和增益由高到低的变化过程.对于异步转移模式的多信道脉冲,脉冲重叠时的功率和增益变化要快于非重叠时功率和增益的变化. 相似文献
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基于速率方程的离散算法,实现了对双包层Er^3+/Yb^3+光纤放大器动态特性的分析。研究了不同信号和泵浦功率下单信道的瞬态功率、脉冲序列输出功率与增益随时间的变化以及多信道异步转移模式下输出功率和增益随时间的变化。结果表明:对于单个脉冲,在相同的泵浦功率下,输出脉冲的峰值功率取决于输入脉冲的峰值功率;在不同的泵浦功率下,输出脉冲的峰值功率取决于泵浦功率。对于脉冲序列,在达到稳定的输出前,将经历一个输出功率和增益由高到低的变化过程。对于异步转移模式的多信道脉冲,脉冲重叠时的功率和增益变化要快于非重叠时功率和增益的变化。 相似文献
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采用分步的傅立叶方法数值求解了一维的耦合非线性薛定鄂方程,模拟了超短光脉冲在双芯光子晶体光纤中的非线性传输和孤子开关现象的产生.分析了泵浦脉冲的脉宽、入射峰值功率对孤子开关现象的影响.研究表明:当泵浦激光的入射峰值功率低于孤子开关的阈值功率时,能量转换效率很高;当泵浦激光的入射峰值功率超过孤子开关的阈值功率时,孤子发生了明显的分裂现象,产生了多个频率成分,孤子开关现象逐渐消失.此外,也研究了双脉冲在双芯光子晶体光纤中的非线性传输特性,研究表明:入射峰值功率和脉冲延迟对孤子的分裂和能量转移有重用影响. 相似文献
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固体脉冲激光器通常有两种工作方式:脉冲闪灯泵浦,振荡重复频率很低(<100赫),但峰值功率高;连续泵浦脉冲激光器,振荡重复率很高(几千或几兆赫),但峰值功率低。中等重复率脉冲激光器可用脉冲反射方式或脉冲透射方式Q开关,而高重复率激光器可以是腔倒空方式或锁模方式工作。许多应用包括搜索雷达在内要求激光器具有高的峰值功率和几千赫的重复频率。本文介绍一种闪灯泵浦Q开关Nd:YAG~(3 )激光器其重复频率几千赫,峰值功率超过500千瓦。 相似文献
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Akhmanov S. Chirkin A. Drabovich K. Kovrigin A. Khokhlov R. Sukhorukov A. 《Quantum Electronics, IEEE Journal of》1968,4(10):598-605
A theory of nonstationary nonlinear wave phenomena occurring in the field of ultrashort high-intensity light pulses is developed (harmonic generation and parametric amplification stimulated Raman scattering). The main equations are given, the group velocity mismatch effects are studied, and special attention is paid to the high-conversion conditions. The possibilities of picosecond pulse narrowing on account of linear and nonlinear nonresonance parametric amplification and harmonic generation are studied in detail. The factors that determine the minimum light-pulse duration (dispersion broadening) are examined. A nonstationary theory of stimulated Raman scattering (SRS) is developed. Expressions for minimum pulse duration in forward and backward SRS are given. Reduction of Raman amplification with a picosecond pump is discussed. 相似文献
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We have analyzed the basic characteristics of all-optical demultiplexing (DEMUX) based on four-wave mixing (FWM) in semiconductor optical amplifiers (SOAs) by solving a modified nonlinear Schrodinger equation by the finite-difference beam propagation method. Amplified spontaneous emission noise was not included in our model. The optimum pump pulsewidth for obtaining the high ON-OFF ratio is 1~3 ps for 1 ps, 250 Gb/s probe pulses. The shorter limit of the pulsewidth is due to detuning between the pump and probe frequencies, which is determined by the gain bandwidth of the SOA. In order to achieve faster DEMUX operation, an SOA with broader gain bandwidth is required. We also simulated pattern effects in the FWM signal. Power fluctuation in the FWM signal can be reduced by using a strong energy pump pulse and/or weak energy probe pulse. The energy fluctuation of the FWM signal decreases to less than 1% for a 30-bit, 250-Gb/s input probe pulse train with a pulse energy of 0.01 pJ. This small fluctuation should not disturb DEMUX operation. We have also examined DEMUX from time multiplexed signals by repetitive pump pulses. Strong energy pump pulses decrease the FWM signal intensity. However, there is no pattern effect due to gain saturation because the pump pulses are injected continuously 相似文献
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In this paper, a high-power erbium-doped fiber amplifier (EDFA) for the temperature sensor system is theoretically designed and experimentally demonstrated. It consists of an erbium-doped fiber that is pumped bidirectionally with two 980-nm high-power laser diodes (LDs). At the EDFA input, an optical isolator (ISO) is used to ensure that the signal pulse transmits forward only. After that, a wavelength division multiplexer (WDM) is employed to combine the forward pump laser (980 nm) and incident optical pulse (1550nm) into the erbium-doped fiber for direct amplification in the optical domain. At the EDFA output, another WDM couples the backward pump laser (980 nm) into the erbium-doped fiber and outputs the amplified optical pulse (1550 nm) with an ISO followed to isolate the backscattering light. According to this structure, we carried out the experiment in the condition as follows. For 980 nm pump LD, the operating current is 590 mA, and the setting temperature is 25℃. For EDFA, the length of erbium-doped fiber is 12.5 m, and the power of 1550 nm input signal is 1.5 mW. As a result, the power of pump LD is 330 mW, and the power uncertainty is 0.5%. The power of EDFA output at 1550 nm is 300 mW, and the power uncertainty is ±3 mW. 相似文献
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Backward optical parametric oscillators and amplifiers 总被引:1,自引:0,他引:1
Degenerate backward optical parametric oscillators and amplifiers have been considered, for the first time, to the best of our knowledge. When the pump intensity is four times the threshold pump intensity, the conversion efficiency reaches a maximum value. On the other hand, for nondegenerate optical parametric oscillators, the conversion efficiency always increases as the pump intensity increases. This behavior is different from those for forward optical parametric oscillators. In either configuration, the oscillation can occur without an external feedback. There is, however, a distributed feedback provided through the opposite propagation directions of the signal and idler. The threshold pump intensities for the oscillators can be achieved by the lasers currently available based on quasi-phase matching in several structures. As the input intensity for the backward parametric wave increases, the gain for this wave decreases dramatically if the pump intensity is on the order of the threshold or higher. When the input intensity is much larger than the threshold pump intensity, there is almost no gain regardless of the level of the pump intensity 相似文献
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The output characteristics of nonlinear optical fiber-loop mirror are analyzed in detail when the pump pulses with the same wavelength are input in the both directions for recovering the clock component of the signal spectrum.It is found that the double output pulses are produced in the transmission port of the nonlinear optical fiber-loop mirror.The output pulse peaks are located in time domain at the rising and falling edges of the pump pulses.It is demonstrated that the rising and falling edges of the pump pulse can be directly extracted by this method.Through numerical simulation,the effects of therelative delay of pump pulses and the dispersion of fiber on the characteristics of output pulses are studied.By spectrum analysis,it is found that the spectrum of output pulse sequence includes the clock components of the pump pulse sequence,and a new idea is provided for all-optical clock extraction. 相似文献
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群速度色散和高阶非线性效应是影响超强超短脉冲抽运下光参变放大能量转换效率的重要因素.为了提高光参变放大的能量转换效率,采用理论分析和数值计算的方法,模拟超强超短激光脉冲抽运下MgO:LiNbO3晶体中的光参变放大过程,得到了不同抽运功率密度、不同群速度色散条件下光参变放大的能量转换效率曲线,并且讨论了高阶非线性效应对和脉冲时间波形和频谱的影响.结果表明,群速度色散会使抽运光脉宽增加,功率密度降低;大功率密度抽运下高阶非线性效应的影响不可忽略,它会进一步减小能量转换效率,还会使信号光的频谱展宽,为了提高单位晶体长度的参变放大增益,可以通过引入初始啁啾来抵消群速度色散的影响. 相似文献
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侧面分布式泵浦双包层脉冲光纤放大器 总被引:1,自引:1,他引:0
采用自行研制的光纤侧面耦合器,设计和研制了侧面分布式泵浦、两级全光纤连接的掺镱双包层脉冲光纤放大器,实现了输出波长为1064nm、平均输出功率达到2.12W、脉冲宽度20ns、重复频率50kHz的高功率、高重复频率全光纤结构脉冲光纤放大器.光纤侧面耦合器对泵浦光耦合效率最高达到69%,对反向信号光的隔离度最低为17dB,有效避免了高功率脉冲回波对泵浦光源的损害,使用更高泵浦耦合效率的侧面耦合器,可进一步提高放大器输出功率. 相似文献
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为了优化设计基于光学差分参量放大的布里渊光时域分析抽运的脉冲编码形式以及斯托克斯光与反斯托克斯光脉宽差,采用微扰法和小信号近似法,获得了探测光与斯托克斯光脉冲、反斯托克斯光脉冲在较小作用区域内的脉冲响应,对其性能进行了理论分析与数值验证。结果表明,相位斯托克斯光脉冲可有效压缩布里渊增益谱宽,提高布里渊信号信噪比;当斯托克斯光与反斯托克斯光传感脉冲脉宽差为8ns时,探测光布里渊增益最大。这一结果对进一步分析基于光学差分参量放大的布里渊光时域分析系统性能以及开展相关实验研究是有帮助的。 相似文献
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人眼安全光学参量振荡器最佳泵浦脉宽 总被引:1,自引:0,他引:1
本文讨论了对于人眼安全KTP光学参量振荡器存在一个最佳泵浦脉宽,此时OPO阈值的变化最小,尤其是对于剩余泵浦光被安全反射回去的单谐振OPO。当泵浦脉宽与最佳泵浦脉宽相近时,所需泵浦脉冲能量最小。这对设计小型低阈值OPO器件有极大的指导意义。 相似文献