Simplified theoretical model describing mof raman amplifier has been builded on our own , and simulation program has also been developed . the effects of gain and noise figure of mof raman amplifier with 分析了泵浦方式和损耗对放大器增益和噪声特性的影响,并对其增益饱和特性进行了研究。
The calculation of relative variation of the negative feedback amplifier by differential method results in some errors under certain condition , so there was certain limitation in this method 摘要利用求微分的方法计算负反馈放大器增益的相对变化量，由于在一定的条件下计算出的结果存在一定误差，因而使用这种方法具有一定的局限性。
Formula of gain has been developed by rate equations , several factors , such as doped concentration of er3 + - yb3 + , configuration of waveguide amplifiers and pump power etc , have been analyzed to increase gain 由速率方程得出光波导放大器的增益公式,分析影响放大器增益的各个因素。主要从铒镱离子的掺杂浓度,放大器的结构及泵浦功率三方面加以讨论。
Then research the affect of the system character by the different load stiffness and the relation between load stiffness and the amplifier gain , bring forward a method of adjusting the amplifier gain dynamic to improve the system character 当负载为弹性负载时，研究负载刚度的变化对系统性能的影响和负载刚度与放大器增益的关系，提出了一种动态调节放大器增益以改善系统性能的方法。
With the updating of wdm system and development of optical transition network , gain - clamped erbium - doped fiber amplifier ( gc - edfa ) fixes the problem of gain fluctuation and vibrating when input power and upload channel numbers are changing 随着wdm系统的升级及光传送网络的发展,增益控制掺铒光纤放大器( gc - edfa )在输入功率和通道数目变化时维持放大器增益稳定方面,发挥着日益重要的作用。
( 3 ) . the flattening arithmetic of an edfa was presented based on the inter - correlative function between the gain spectrum function of the edfa and that of the reserve transmission spectrum of the lpfg . for optimal matching between the two spectra , the flattening arithmetic calculates the variation of the resonant amplitude and wavelength of the lpfg Iii .提出了一种动态增益均衡的平坦算法，这种算法的本质就是利用掺铒光纤放大器增益谱函数和新型长周期光纤光栅的透射谱反转谱函数的相关性，给出新型长周期光纤光栅谐振峰幅度和位置的调节量，使改变后的新型长周期光纤光栅的反转谱线能和edfa的增益输出谱线进行最佳匹配。
This article according to the acquirement of the system parameters such as : temperature sensitivity 、 angle resolution 、 image forming time etc to design the type and diameter of the antenna ; the receiver type , integral time , rf gain , lpf gain ; the mode of calibration ; the sample frequency and program of the daq ; the scanning time , scan type , etc 本文根据系统温度灵敏度、角分辨率、成像时间等参数要求,对系统天线类型、直径,接收机类型、积分时间、射频增益、视频放大器增益,定标方式,数据采集卡的采样频率、编程及驱动装置的扫描速度、扫描类型等进行了详细的分析设计。
To accelerate the development of next generation high dwdm system , the pape r also researches the property of gain . based on optical wave nonlinear transmission equation , the gain model of fra is established . by the way of numerical analysis , it is obtained that the gain of fra has relation with pump power , input signal wave power , the effective area and absorption of fiber . the obtained conclusion has definite instruction to the design of fra 为了促进下一代超高速dwdm密集波分复用技术的发展，本文还研究了光纤喇曼放大器的增益特性，根据光波非线性传输方程建立光纤喇曼放大器增益模型，通过数值模拟分析了泵浦波功率、信号输入光功率、以及光纤有效面积和损耗对光纤喇曼放大器增益的影响，得出了一些对光纤喇曼放大器的设计有一定的指导意义的结论。
At last , in term of the property of wide band of fra , the interference between channels of multi - channel amplification system is discussed . in multi - channel system , the relations between signal - interference ratio and input signal wave power , between signal - interference ratio and the number of channel and between signal - interference ratio and gain of fra have be discussed . the way of restraining the interference is produced 最后结合喇曼放大器宽带宽的特性讨论了在多信道系统中光纤喇曼放大器的串扰问题，研究了在多信道系统情况下，系统中的信扰比与信号输入光功率、信道数以及放大器增益之间的关系，并提出了减小此串扰的方法。
At last , control circuit of one cycle controlled bridge switching power amplifier is improved with the basic idea of one cycle control . the simulation results show that the amplifier of improved control circuit not only solve the question of output dc offset , but also keep the voltage gain lowered by voltage compensation technique 最后，根据单周控制的基本思路，改进了单周控制的全桥开关功率放大器的控制电路。仿真结果表明，改进控制电路后的系统不但解决了输出直流偏置问题，而且解决了电压补偿方法所造成的放大器增益下降问题。
