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基于神经网络和方程数值解的FRA增益控制方法

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光通信研究 2023年

作者：穆宽林武岳周健殷仕淑安徽财经大学管理科学与工程学院

【目的】基于多泵浦技术的光纤拉曼放大器（Fiber Raman Amplifier， FRA）拥有噪声低、增益带宽大和增益谱形状可控的特点，其是长距离光纤传输网络系统的理想光中继放大器。在动态光纤传输网络系统中需要增益自适应可控的智能光放大... 详细信息

【目的】基于多泵浦技术的光纤拉曼放大器（Fiber Raman Amplifier， FRA）拥有噪声低、增益带宽大和增益谱形状可控的特点，其是长距离光纤传输网络系统的理想光中继放大器。在动态光纤传输网络系统中需要增益自适应可控的智能光放大器，文章介绍了一种基于神经网络和拉曼功率耦合方程数值解的FRA增益控制方法。【方法】首先，收集包含FRA中信号光增益值和泵浦光功率和波长值的数据集来训练神经网络，建立FRA中信号光增益和泵浦光参数的近似映射关系。然后，利用训练后的神经网络根据信号光的目标增益值确定FRA初始泵浦光功率和波长值。最后，通过求解拉曼功率耦合方程数值解的方法优化泵浦光功率值，达到提升FRA输出信号光增益准确度的目的。【结果】文章对所使用的训练数据集中各组信号光增益平坦度对最终FRA输出信号光增益准确度的影响进行了研究。仿真结果显示，所使用训练数据集中各组信号光增益波动越小，FRA输出增益准确度越高。当训练数据中各信号光增益波动低于2 dB时，FRA输出的1000组检验信号光增益的均方根误差的均值和方差分别为0.230 dB和0.010 dB，增益的最大误差的均值和方差分别为0.462 dB和0.044 dB。【结论】以上的结果说明本文所述方法可以实现高准确度的FRA增益控制，该方法为动态光纤传输网络中智能光放大器增益自适应控制的研究提供了新的思路和方法。

关键词：光纤拉曼放大器神经网络方程数值解增益

混合式教学模式下C语言课程的教学改革实践探究

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电脑知识与技术 2023年第17期19卷 43-46页

作者：曹雪能吴雪周鲜鲜穆宽林安徽财经大学安徽蚌埠233030

通过分析C语言教学目标、现状及问题,着力打破传统的课程体系,探讨如何提高C语言课程的教学质量,提出“线上线下+翻转课堂”混合式教学模式,对C语言课程的教学方法、教学资源、实践内容、考核评价体系等提出了多项改革措施,并在学院内... 详细信息

通过分析C语言教学目标、现状及问题,着力打破传统的课程体系,探讨如何提高C语言课程的教学质量,提出“线上线下+翻转课堂”混合式教学模式,对C语言课程的教学方法、教学资源、实践内容、考核评价体系等提出了多项改革措施,并在学院内部实施,取得良好的教学效果,证实C语言改革措施的有效性与必要性。

关键词：混合式教学模式 C语言线上线下改革

基于F-P腔的可调谐激光器频率稳定度测量及其稳频设计

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基于F-P腔的可调谐激光器频率稳定度测量及其稳频设计

作者：穆宽林天津理工大学

学位级别：硕士

半导体激光器自产生以来，以其拥有的体积小、转换效率高、寿命长、波长覆盖范围宽，可低功率低电流直接抽运，工作电压和电流与集成电路兼容等优点，目前已经被广泛应用于光纤通信、原子频率标准、激光测距、高分辨率激光光谱、原子核... 详细信息

半导体激光器自产生以来，以其拥有的体积小、转换效率高、寿命长、波长覆盖范围宽，可低功率低电流直接抽运，工作电压和电流与集成电路兼容等优点，目前已经被广泛应用于光纤通信、原子频率标准、激光测距、高分辨率激光光谱、原子核物理等方面。在激光器的研发跟生产过程中，激光器输出频率稳定度的测量及稳频设计对提高激光器的性能具有重要的实际意义。由于激光具有很高的频率，采用一般的波长计直接测量法很难达到较高的精确度。而且目前常用的拍频测量方法要求一个高稳定的参考光源，所以在频率稳定性的测量方面该法有一定的限制。本文的主要工作内容及创新点如下： 1.提出了一种基于F-P腔的可调谐激光器频率稳定度测量的新方法。该方法不需要一个高稳定的参考光源。实验结果显示，激光器在800ms积分时间的平均漂移量约为10.5MHz。并且该方案拥有较大的测量范围。 2.推导了利用F-P腔透射峰的一次谐波分量的稳频过程，实验实现了793nm半导体激光器的频率锁定，使得激光器频率在锁定状态下的稳定度达到了1.5010-9，频率漂移量在570KHz（800ms积分时间）以下，较相同时间段内激光器自由运转时的频率起伏(约10.5MHz)有了显著的改善。

关键词：共焦F-P干涉仪调谐半导体激光器稳定度阿伦方差

基于知识体系的可分解项目在C语言教学中的应用

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集成电路应用 2023年第3期40卷 354-355页

作者：穆宽林周鲜鲜曹雪能武岳安徽财经大学安徽233030

阐述C语言知识体系的可分解项目式教学方法,该类项目的特点是能够全面涵盖C语言知识点,项目具有可分解性和可扩充性,各子项目的困难度可由浅入深,从而实现知识体系的可分解项目能够保证项目教学法实施。

关键词：计算机系统 C语言知识体系可分解项目式教学

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基于DVB-S2的第五代海事卫星通信系统

中国新通信 2017年第20期19卷 98-100页

作者：穆宽林中国交通通信信息中心

本文介绍了卫星通信技术标准DVB-S2标准流程,全球海事卫星通信系统的发展状况以及基于DVB-S2技术的第五代海事卫星通信系统Global Xpress的系统结构,有助于了解和掌握全球最新一代移动卫星通信技术的发展。

关键词： Global Xpress DVB-S2 ACM 系统结构

Modeling of cascaded high isolation bidirectional amplification in long-distance fiber-optic time and frequency synchronization system

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Chinese Physics B 2021年第7期30卷 294-302页

作者：穆宽林陈星王正康乔耀军喻松 The State Key Laboratory of Information Photonics and Optical Communications School of Information and Communication EngineeringBeijing University of Posts and TelecommunicationsBeijing 100876China School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China

We propose a physical model of estimating noise and asymmetry brought by high isolation Bi-directional erbiumdoped fiber amplifiers(Bi-EDFAs),no spontaneous lasing even with high gain,in longdistance fiber-optic time and frequency(T/F)synchronization system.It is found that the Rayleigh scattering noise can be suppressed due to the high isolation design,but the amplified spontaneous emission(ASE)noise generated by the high isolation Bi-EDFA and the bidirectional asymmetry of the transmission link caused by the high isolation Bi-EDFA will deteriorate the stability of the system.The calculated results show that under the influence of ASE noise,the frequency instability of a 1200 km system composed of 15 high isolation Bi-EDFAs is 1.773×10^(-13)/1 s.And the instability caused by asymmetry is 2.6064×10^(-16)/30000–35000 s if the total asymmetric length of the bidirectional link length is 30 m.The intensity noises originating from the laser and detector,the transfer delay fluctuations caused by the variation in ambient temperature and the jitter in laser output wavelength are also studied.The experiment composed of three high isolation Bi-EDFAs is done to confirm the theoretical analysis.In summary,the paper shows that the short-term instability of the T/F synchronization system composed of high isolation Bi-EDFAs is limited by the accumulation of ASE noise of amplifiers and the laser frequency drift,while the long-term instability is limited by the periodic variation in ambient temperature and the asymmetry of the amplifiers.The research results are useful for pointing out the direction to improve the stability of the fiber-optic T/F synchronization system.

关键词： time and frequency synchronization erbium-doped fiber amplifier instability Allan deviation

Characteristics of spectral-hole burning in Tm^(3+):YAG based on the perturbation theory

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Chinese Physics B 2014年第6期23卷 37-43页

作者：张世宇马秀荣张双根陈雷王夏洋穆宽林王松 Engineering Research Center on Communication Devices (Ministry of Education) School of Computer and Communication EngineeringTianjin University of Technology Tianjin Key Laboratory of Film Electronic and Communication Device School of Electronic Information EngineeringTianjin University of Technology

In this paper, the physical mechanism of the interaction between electromagnetic wave and spectral-hole burning crystal material is investigated in detail. In the small signal regime, a perturbation theory model is used to analyze the mechanism of spectral-hole burning. By solving the Liouville equation, three-order perturbation results are obtained. From the theoretic analysis, spectral-hole burning can be interpreted as a photon echo of the zero-order diffraction echo when the first optical pulse and the second optical pulse are overlapped in time. According to the model, the spectral-hole width is dependent on the chirp rate of the reading laser. When the chirp rate is slow with respect to the spectral features of interest, the spectral hole is closely mapped into time domain. For a fast chirp rate, distortions are observed. The results follow Maxwell-Bloch model and they are also in good agreement with the experimental results.

关键词： perturbation theory spectral-hole burning photon echo

Characterization of spectral hole depth in Tm^(3+) :YAG within the cryogenic temperature range

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Chinese Physics B 2013年第6期22卷 413-417页

作者：陈雷马秀荣王伟张双根穆宽林王夏洋张世宇 Engineering Research Center on Communication Devices(Ministry of Education) School of Computer and Communication EngineeringTianjin University of Technology Tianjin Key Laboratory of Film Electronic and Communication Device School of Electronic Information EngineeringTianjin University of Technology

In this paper, spectral hole depth dependence on temperature below 10 K in Tm^3＋：YAG crystal is investigated in detail. A novel model is proposed to analyze the temperature dependence on the spectral hole. By using the proposed model, we theoretically deduce the temperature dependence of spectral hole depth. The results are compared with experimental results and they are in good agreement. According to the theoretic results, the optimum temperature in experiment can be found.

关键词： phonon process spectral hole depth spectral hole width Tm^3＋：YAG

Measurement of frequency stability in tunable lasers by using an F-P interferometer

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Optoelectronics Letters 2014年第1期10卷 74-76页

作者：穆宽林马秀荣张双根张世宇王夏洋 Engineering Research Center on Communication Devices of Ministry of Education School of Computer and Com-munication EngineeringTianjin University of Technology Tianjin Key Laboratory of Film Electronic and Communication Device School of Electronic Information Engi-neeringTianjin University of Technology

A method for measuring the frequency stability of tunable laser is proposed by using confocal Fabry-Perot(F-P)interferometer.The F-P interferometer is used to get the output frequency of the laser as a reference,and the method eliminates the need of an independent optical source as a frequency reference.Using this technique,the frequency stability of the tunable external-cavity diode laser(ECDL)is measured to be 2.26×10^(-9)with an integration time of 20 ms.

关键词：可调谐激光器频率稳定度稳定性测量干涉仪外腔二极管激光器输出频率积分时间仪用