基于波长选择开关的可重构光纤时频传递技术研究
文献类型：学位论文
| 作者 | 熊晓锋 |
| 文献子类 | 硕士 |
| 导师 | 蔡海文 |
| 关键词 | 光纤时频传递 optical time and frequency transfer 光纤通信网络 optical fiber communication network 波长选择开关 wavelength selective switch 光纤光学 fiber optics |
| 其他题名 | The research of reconfigurable optical fiber time-frequency transmission technology based on wavelength selective switch |
| 英文摘要 | 高精度光纤时频传递技术在基础物理实验、时频计量、雷达管控、导航定位等领域都有着重要的应用。目前，点对点的光纤时频传递技术已经相对成熟，亟需向着与光纤通信网融合和构建大规模组网等网络化方向发展，从而满足下一代网络雷达、导航定位、守时授时等技术应用对地面高精度时频网络的需求。近年来，国内外研究团队围绕着光纤时频传递的网络化进行了多方面研究，特别是在时频传递网络拓扑结构方面提出了级联结构、树形结构、环形结构等模型，并进行了一些实际应用，如NASA深空探测网和欧洲精准时间频率传递网络。光纤时频传递虽然已经实现在线性和环状网络中的多点下载与上传，但是距离在商用光纤网络上实现网络化时频传递还有较远的距离。研究如何利用商用光纤网络实现高精准的时频信号传递具有重要的战略意义。本文面向光纤时频传递网络化应用需求，从时频基础理论出发进行了一系列的分析和实验，研究了基于波长选择开关的可重构光纤时频传递技术，完成的工作主要有以下几个方面： 1、 系统分析了包含波长选择开关的光纤时频传递系统中的噪声来源，着重分析了包含波长选择开关在内的光无源器件背向散射和功率衰减带来的影响，将功率衰减以载噪比恶化的方式加以建模，并针对不同的时频信号调制深度、放大器个数、时频信号频率、初始光功率等情况进行了仿真，从而更清楚地得到了功率衰减对系统时频传递性能的影响特征：衰减越大、系统的信噪比越低、传递时频信号的短期稳定性就越差，而时频信号的长期稳定性主要受温度等其它噪声来源的影响，功率衰减对其影响不大。理论仿真的结论为后续实验探究提供了依据和方向。 2、 对光纤网络关键器件光波长选择开关的时频传递性能进行了全面研究。首先研究了波长选择开关的各参数对时频传递性能的影响，其中波长选择开关的端口一致性、功率衰减比例、以及入射光偏振态等都会对其时频传递性能产生较大影响。在此基础上对含波长选择开关的时频传递系统的开环、闭环特性，以及在闭环情况下波长选择开关的动态切换对时频传递系统的影响进行了研究。为在包含波长选择开关的商用光纤网络中传递时频信号提供了依据和改进方向。 3、 结合波长选择开关，设计并搭建了一个具备部分可重构能力的光纤时频传递网络，对其连通性、时频稳定性、网络拓扑、抗毁损的动态重构特性进行了初步研究。系统各点得到了高性能的时频信号，频率秒稳定度最差达到5.46×10-14，时间同步准确度最差达53.8ps，实现了较好的连通性、时频稳定性，并演示了网络在不同拓扑结构之间切换的能力。然后分别针对网络链路性能恶化和完全破坏等损毁机制研究了网络衰减重构特性和切换重构特性，其中在突发光衰减后恢复初始状态的最快重构时间仅需要300ms，可以实现快速重构。; High precision optical fiber time-frequency transmission technology has important applications in basic physics experiment, time-frequency measurement, radar control, and navigation, etc. Now point-to-point optical fiber transmission technology is relatively mature in time-frequency domain. It needs to merge with optical fiber communication network, or develop a construction of large-scale network, so as to satisfy the requirement of the next generation network technology applications, such as radar, navigation and positioning. Recent years, the international and domestic research teams did a lot of work around the fiber time-frequency transmission network, especially on network topology structure. They put forward some network structure models, such as the cascade structure, tree structure and ring structure, and put them into some practical applications, for example, NASA's deep space network and Europe accurate time and frequency transfer network used the structures. For optical fiber time-frequency transmission, multi-point download and upload have been realized in the linear and annular network, but it's still far from transmitting time-frequency signal in commercial optical fiber network. So it is of great strategic significance to study how to use commercial optical fiber network to realize high precision time-frequency signal transmission. In order to meet the needs of realizing time-frequency signal network transmission, some analysis and experiment is done. In this article, the reconfigurable optical fiber time-frequency transmission technology based on wavelength selective switch is studied. The work accomplished is mainly in the following aspects: 1、 The noise source of the fiber time-frequency transmission system, which contains wavelength selection switch, is systematically analyzed. Among all the factors, the backscattering and the power attenuation, caused by the optical passive components including WSS, are focused on. We analyze how power attenuation influences our system by related it to carrier to noise ratio. In order to know how the attenuation influence the system better, simulation is made in different time-frequency signal modulation depth, different numbers of amplifier, different signal's frequency and different initial optical power. And we made the conclusion, the higher the attenuation makes the signal to noise ratio lower, and the short-term stability of the time-frequency signal becomes worse, while the long-term stability is mainly affected by the noise sources such as temperature, so the power attenuation has little effect. The conclusion of theoretical simulation provides the basis and direction for the follow-up experiment. 2、 The time-frequency transfer performance of the wavelength selective switch, the key device of optical fiber network, is systematically studied. Firstly, we studied how the parameters of the wavelength selection switch influence the transmission performance of the system, and it is proved that the wavelength selection switch's port consistency, power attenuation ratio, and the incident light polarization influenced the time and frequency transfer performance a lot. Then, the free running and compensated characteristics of transmission system are also studied. In addition, the influence wavelength selector switch's dynamic switching brings to the system is studied as well in the compensated system. All the consequence of the experiment show，it is possible to transmit time-frequency signal in commercial optical fiber network with wavelength selective switch，and it makes us know how to improve the performance of the system as well. 3、 A reconfigurable optical fiber time-frequency transmission system is established, which contains wavelength selective switch. Moreover, its connectivity, time and frequency stability, network topology, the dynamic reconfiguration of damage resistance characteristics is studied. Each point of the System obtained ultra-stable time and frequency signals，and the stability of the frequency signal in each site is not worse than 5.46×10-14@1s.The system achieved good connectivity, time and frequency stability, and it have the ability to switch between different topology. Then we analyzed the reconfiguring ability of the system in different scenes，such as network link performance deteriorated or completely destroyed. When sudden light attenuation happens, it takes 300ms to make reconfiguration at least. |
| 学科主题 | 光学工程 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/31079]  |
| 专题 | 中国科学院上海光学精密机械研究所 |
| 作者单位 | 中国科学院上海光学精密机械研究所 |
| 推荐引用方式 GB/T 7714 | 熊晓锋. 基于波长选择开关的可重构光纤时频传递技术研究[D]. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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