半导体激光器调制特性的人工神经网络仿真

对半导体激光器调制特性进行了理论分析，通过研究半导体激光器调制特性的速率方程，推导了调制特性的解析表达式。用广义回归神经网络建立了激光器调制特性的神经网络模型，通过训练好的神经网络模型对激光器调制特性进行了深入分析，并对激光器结构进行了仿真设计。模型输出结果与理论分析的结果相吻合，且该方法具有速度快、精度高、重复性好等优点。研究结果表明，利用神经网络模型可以对半导体激光器性能进行分析，并确定半导体激光器的一些结构尺寸。     

增益非线性参数对半导体激光器调制特性的影响

本文用小信号分析法建立了半导体激光器调制的数学模拟，用这个模型研究了增益与载流子密度的非线性依赖关系对半导体激光器的功率调制、波长调制和ＣＰＲ值的影响。     

DFB激光器调制特性ANN建模与设计

通过研究分布反馈式(DFB)激光器调制特性的速率方程，推导了调制特性的解析表达式，建立了调制特性神经网络(ANN)模型，计算机仿真与理论分析的结果相吻合。用此模型对激光器结构进行了仿真设计，得到的结果对激光器的生产设计具有重要的指导意义。     

含寄生网络的激光器小信号调制响应模拟新方法

在高速通信中应准确分析激光器高频调制响应需要计及寄生网络的影响。推导了激光器测试系统散射参数与本征响应传输函数之间的关系，提出用激光器散射参数扣除求取激光器本征响应和模拟激光器整体小信号调制响应的新方法。结合激光器的等效电路和速率方程分析，避免了单独测量寄生网络和估计有源区电路参数。对法布里-珀罗型激光器样品测试发现，仿真与实验的结果吻合。这一模拟方法简便快捷，准确性好。     

腔内调制激光器的输出特性及其研究进展

激光器的腔内调制与腔外调制相比有许多独特的优点，因而可望在未来的宽带光通信中得到应用。带有反馈的腔内调制激光器，其输出将出现双稳，多稳特性，因而可用数字光通信的调制源。带长延时的腔内调制激光，春输出将出现不稳定混沌现象，且共与腔外调制有本质的区别。本文对腔内调制激光系统的输出特性作了较全面的概述。     

高速半导体激光器的设计

高速调制半导体激光器光源是高速光纤通信系统、相控阵雷达等的关键器件。本文分析了影响半导体激光器调制带宽的各种因素，系统地介绍了提高调制带宽的途径，并讨论了高速半导体激光器的典型结构和制造工艺。     

基于扣除法的半导体激光器高频响应仿真新方法

基于激光器速率方程和等效电路模型对激光器高频响应特性进行分析，提出了一种采用激光器频率响应扣除法提取有源区本征响应和预测激光器整体频率响应的仿真新方法．用该方法对实验样品的高频调制响应进行了仿真，仿真结果与实际测量数据相吻合．     

耦合腔激光器的波长调谐与频率调制特性分析

考虑用激光器与调制器直接耦合以及耦合槽的影响，用散射矩阵法及二步等效反射率法，对沟槽耦合腔激光器的波长调谐和频率调制特性的分析表明，数学处理简单，物理图像清晰。     

日立制作所开发出世界最高速的半导体激光器

日立制作所成功地开发出有可能实现每秒千兆比特(bit)大容量光传输的半导体激光器。半导体激光器超高速化的必要条件是实现这样的元件结构,其中①用单色性好的光使激光器振荡,②当对激光器的注入电流进行超高速调制时,激光器发出的光跟着受超高速调制。半导体激光器的高速性能由其调制频带表示,它越高调制速度就越高。半导体     

1310nm短波长电吸收调制激光器

由Multiplex公司研制的MTX３１０EW型激光器是一种速率为１０Gbit／s、波长为１３１０nm的短波长电吸收调制激光器。这种激光器综合了１３１０nm波长技术和基于电吸收调制激光器（EML）平台技术，取代了利用１５５０nm波长技术的EML系统和使用分布反馈调制的１３１０nm波长激光器系统。这使光纤带宽扩展进入到S谱带。（No．３６）1310nm短波长电吸收调制激光器@小平     

A modification of the Gummel—Poon charge-control equations

The incorporation of the effect of basewidth modulation on the base transit time in the dc Gummel-Poon charge-control equations results in the modeling of basewidth modulation and high-level injection effects by separate factors.     

Phase recovery of the coherent carrier frequency in synchronous detection

This paper considers a method of phase recovery in synchronous detectors that ensure the synchronous detection of signals with amplitude modulation, amplitude-phase modulation, angle modulation or with appropriate manipulations. In addition a transfer function was obtained for the phase-locked loop of direct control and the simulation results of modeling were also presented.     

PWM调制波的多层感知神经网络音频识别

研究了在PWM调制情形下音频信号的保真度分析及音频信号的频率、相位分布建模及其识别.基于Matlab/Simulink建模环境下建立了音频识别系统,利用滤波器对调制波进行归一化操作来完成对信号的预处理.基于音频信号模型构造了3类音频信号.经过识别系统的调制、滤波调理后输入至训练好的多层感知神经网络,分析识别结果显示,音频频率越高时,载波频率较低会降低系统识别率;提高载波频率可提高系统的识别率;并与相应的经典音频识别方案进行了比较.     

Circuit modeling of the effect of diffusion on damping in a narrow-stripe semiconductor laser

This paper describes a circuit modeling technique for directly modulated narrow-stripe semiconductor lasers with strong carrier confinement and index guiding. It is shown that diffusion damping of the modulation response, due to a nonuniform electron density distribution in the active layer, can be accounted for in terms of an equivalent optical gain saturation. Based on this equivalence, a small-signal ac circuit model of a narrow-stripe laser is derived. The model can be used to determine the intensity modulation and frequency modulation response characteristics of a packaged device.     

基于WVD的防空雷达直升机信号特征分析

基于直升机目标旋转部件的调制模型，本文针对防空雷达提出了分析直升机信号特征的一种新方法——WVD法，并对直升机目标旋转部件调制回波信号在不同噪声情况下加以仿真分析，结果表明：用WVD分析雷达回波中直升机信号特征是一种非常有效的方法。     

High-speed modulation of semiconductor lasers

An overview is given of the direct modulation performance of high-speed semiconductor lasers, The high-speed response characteristics are described using a cascaded two-port model of the laser. This model separates the electrical parasitics from the intrinsic laser and enables these subsections to be considered separately. The presentation concentrates on the small-signal intensity modulation and frequency modulation responses, and the large-signal switching transients and chirping. Device-dependent limitations on high-speed performance are explored and circuit modeling techniques are briefly reviewed.     

High-speed modulation of semiconductor lasers

An overview is given of the direct modulation performance of high-speed semiconductor lasers. The high-speed response characteristics are described using a cascaded two-port model of the laser. This model separates the electrical parasitics from the intrinsic laser and enables these subsections to be considered separately. The presentation concentrates on the small-signal intensity modulation and frequency modulation responses, and the large-signal switching transients and chirping. Device-dependent limitations on high-speed performance are explored and circuit modeling techniques are briefly reviewed.     

Small-signal modulation of multitransverse modes vertical-cavitysurface-emitting semiconductor lasers

The small-signal modulation response of multi-transverse modes, proton-implanted vertical-cavity semiconductor lasers was studied experimentally and theoretically. Multiresonance frequencies and notches in the modulation response were obtained and the detailed characteristics varied for different overlap levels between the lasing modes. The theoretical modeling matched the experimental results and revealed the coupled oscillators manifestation for highly overlapping transverse modes     

DCGAN信道下的端到端通信系统设计

针对通信系统中长序列建模存在维度诅咒的问题,提出了一种基于深度卷积生成对抗网络(Deep Convolutional Generative Adversarial Networks, DCGAN)信道建模的端到端通信系统改进方案。该方案将卷积神经网络(Convolutional Neural Network, CNN)和条件生成对抗网络(Conditional Generative Adversarial Network, CGAN)结合,利用CNN与全连接层(Fully Connected Layer, FC)的局部连接特性对传输长序列的信道进行建模。通过对参数重新设计及网络结构调整,获得了适应不同调制方式和信道类型的学习网络,将其应用端到端通信系统中,作为收发机之间梯度反向传播的桥梁。仿真实验表明,改进的DCGAN能够以减小的网络规模以及计算量成功地实现长序列建模,并且表现出良好的泛化能力。此外,将建模结果运用到端到端通信系统设计中,可以获得与传统数字调制系统相近的误比特率性能。