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By integration of a bidirectional erbium-doped fiber amplifier and a three-port optical circulator with several fiber Bragg gratings (FBGs), two gain-flattened optical limiting amplifier (OLA) modules are proposed and experimentally demonstrated. They rely on the use of central wavelength misalignment and bending loss methods, respectively. They can effectively cover the whole useful 1.55-mum band. Both modules can provide gain-flattening characteristics over a large input dynamic range. The FBGs integrated OLA configuration has potential application in wavelength division multiplexing lightwave communication systems. 相似文献
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O. Belous A. Fisun L. Rud O. Sukhoruchko 《International Journal of Infrared and Millimeter Waves》2005,26(4):545-553
To decrease the loss of a parametric two-circuit amplifier is a main problem of paper. The use of dielectric inserts with inclined face as a circuit of non-load frequency is considered in the study. Results of electrodynamic simulation of oscillatory processes in a dielectric insert in a rectangular waveguide are represented. Experimental amplitude and noise characteristics of the breadboard model of the parametric amplifier on the basis of the considered filter are given. Within the range of 60 GHz the amplification factor no less than 12 dB over a half-power bandwidth of 1.2 GHz has been obtained with a noise temperature of 550 K. 相似文献
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高速全光逻辑门是实现光分组交换、光计算和未来高速大容量光传输的关键器件,近年来受到广泛的关注。半导体光放大器(SOA)因为具备体积小、工作波长范围宽、响应时间短及良好的非线性特性等优点,成为研制高速全光逻辑器件的首选。采用分段模型分析了SOA的稳态增益饱和特性,通过数值求解载流子速率方程和光传输方程对其特性进行了仿真实现。结果表明,SOA在入射光功率不同时会表现出明显的非线性;在一定范围内增加光功率,SOA增益持续增加,继续增加入射光功率,SOA逐渐进入饱和吸收状态,增益反而降低。 相似文献
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一种新颖的偏振不敏感的基于半导体光放大器的四波混频光波长转换方法 总被引:1,自引:0,他引:1
提出和论述了一种新颖的偏振不敏感的基于半导体光放大器的四波混频光波长转换方法。基本思想是设计和采用一种全光学偏振态转换器 ,理论上能将随机偏振态的输入信号光转换为固定偏振方向且功率基本不变的线偏振光 ,利用它控制信号光的偏振态能够克服四波混频过程所固有的偏振敏感性。将这种方法与正交偏振双抽运方法结合起来 ,能较简单地实现偏振不敏感且具有近似常数转换效率的宽带四波混频光波长转换 相似文献
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We present modelling results investigating the carrier dynamics of an SOA composed of an inhomogeneous array of quantum dots
designed to produce broad gain amplification when optically pumped. We use a set of rate equations that describe the QDs inhomogeneity
and include an energy dependent occupation factor within each inhomogeneously broadened level and numerically solve them with
the propagation equation to investigate the amplification of optical signals in the waveguide. By treating the carrier filling
according to the quasi-equilibrium distribution, we are able to investigate the effect of band-filling (BFE) on the gain and
refractive index. The linewidth enhancement factor (α) is computed and analysed with respect to optical signal intensity as
well as electrical current density. 相似文献
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V. I. Krivoruchko 《Radiophysics and Quantum Electronics》2003,46(8-9):703-706
We consider the structure of a small-size superheterodyne modulation-type radiometric receiver with a low-noise transistor amplifier (LNTA) at the input. With LNTA noise coefficient 3.5 dB, the fluctuation sensitivity of the radiometric receiving unit was 0.025 K in the input-frequency range 56-60 GHz for a time constant 1 s. 相似文献
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报道了一种新型环形腔可调谐多波长光纤激光器,腔内以半导体光放大器为增益介质,利用高双折射光纤构成的高双折射环形镜的滤波特性,在室温下,获得了基本符合ITU-T标准100GHz的17个波长以上的稳定多波长输出.各信道峰值功率差小于6 dB,线宽小于0.102 nm,信噪比大于25 dB.通过调节高双折射环形镜内的偏振控制器状态实现了这一组波长整体在50GHz范围内连续可调谐.并利用实验方法,对该光纤激光器应用于掺铒光纤放大器对多信道放大性能测试的可行性进行了初步探讨. 相似文献
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行波半导体光放大器的偏振特性研究 总被引:1,自引:0,他引:1
以有源法布里-珀罗谐振腔的增益特性为基础,研究了行波半导体光放大器的偏振特性。对行波半导体光放大器的偏振灵敏度与端面反射率、增益系数、光场限制因子等诸因素之间的关系进行了理论分析和实验研究。在此基础上,讨论了改善行波半导体光放大器偏振灵敏度的若干方法,并提出了新的偏振不灵敏行波半导体光放大器结构。 相似文献
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对半导体光放大器(SOA)用于1 310 nm残留边带幅度调制(AM-VSB)视频光信号放大时的非线性失真特性进行了实验研究.分析了非线性失真机理.给出了当输入光信号波长位于SOA增益谱下降沿且输入光信号功率较大时,SOA所引入的非线性失真主要由其增益随输入光信号功率变化而波动所造成的结论和对应表达式.提出了减小非线性失真的方法.设计了适合于AM-VSB视频光信号放大的SOA并用于有线电视(CATV)系统实验.研究结果表明,在300 mA的工作电流下,SOA在载频647.25 MHz处引入的组合二阶互调失真(CSO)在-42 dB~-38 dB之间,并随输入光信号功率的增加而变大. 相似文献
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半导体光放大器的非简并时延四波混合理论 总被引:1,自引:1,他引:0
用二能级宽带模型研究了半导体光放大器(SOA)中非简并相共轭四波混合信号强度随时间延迟的变化规律。结果表明,对这种情形的非简并四波混合共轭信号强度随时间延迟τ变化表明为载流子脉动,且脉动信号以退相速率衰减。鉴于目前用简并四波混合对半导体光放大器超快过程的测量需要大功率激光器作激发源、大光学实验平台和复杂的探测设备的情况下,提出了基于全光通信器件构成非简并四波混合观测半导体光放大器载流子脉动、退相时间新方法,这不仅便于选取抽运与探测光源波长(光通信窗口波长),而且可使测试设备微型化。 相似文献
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Supported by the Ministry of Posts Telecommunications the National Natural Science Foundation of China.QI Jiang CHI Nan ZHENG Yuan CHEN Shuqiang GUAN Kejian 《Chinese Journal of Lasers》2000,9(6):488-492
1 Introduction IntheWDMnetwork ,thedesirablefeaturesofanall opticalwavelengthconverterincludepolarizationinsensitivity ,transparencetomodulationformatandbit rate ,fulltunability ,acceptableoutputSNRovertheentirerangeofthewavelengthsusedinthenetwork[1] .Wave… 相似文献
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Using a semiconductor-fiber ring laser, a novel method for the all optical wavelength conversion based on dual-pump four-wave mixing (FWM) in a semiconductor optical amplifier (SOA) is demonstrated. For the input signal with different wavelengths, only one external pump is needed. This scheme can simplify the dual-pump FWM in SOA and has nearly constant conversion efficiency and signal-to-noise ratio (SNR) over 50nm range of wavelength shifts. 相似文献
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A bi-directional fiber ring laser with a semiconductor optical amplifier has been developed in which a frequency difference between the counter-propagating oscillations is controlled by an introduced birefringent medium. With the material which causes the retardation change by a physical phenomenon to be measured, the laser in this study is applicable to a novel fiber sensor of which the sensing signal is obtained in a frequency domain. 相似文献
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The performance of quantum well and quantum dot semiconductor optical amplifiers was theoretically investigated. The effects
on subpicosecond pulse propagation due to gain and refractive index dispersion, calculated using a microscopic polarization
equation and a reduced wave equation in the linear regime including the background refractive index dispersion, were used
in the comparison. In particular, the spectral shift and phase modulation imposed on the pulse were compared. It is shown
that quantum dot amplifiers suffer comparable spectral shifts to the quantum well amplifier, strong linear frequency chirp
and large pulse broadening. In quantum dot amplifiers with small inhomogeneous broadening, similar pulse break-up is shown
as that calculated for the quantum well amplifier. In quantum dot amplifiers with large inhomogeneous broadening, the background
refractive index dispersion makes the linear frequency chirp the dominant feature. In the light of our calculations, the advantages
and disadvantages of quantum dot and quantum well amplifiers are discussed. 相似文献