全光纤F-P腔可调谐滤波器及在DWDM系统中的应用研究

发布时间：2019-01-19 14:04

【摘要】：随着云计算、物联网以及高清晰度电视等宽带综合业务的出现和推广，对通信速率和稳定性也提出了更高的要求，以DWDM为基础的全光网络，，避免了光电转换代价，突破了电子瓶颈的限制，是解决高速传输业务发展的最佳方案。实现DWDM全光网络无瓶颈的高速传输，这就要求各分立器件是具有高速集成的全光器件，由此，光纤光栅以不可比拟的优势，受到通信界的广泛关注和深入研究。近几年得到迅速发展的光纤光栅是一种新型光纤无源器件，因其易于与光纤通信系统兼容实现全光纤化的优点，被广泛应用于可调谐滤波器中作为波长选择和调谐元件。基于光纤布拉格光栅的法布里-珀罗(FBG-FP)结构型器件更是表现出了极大的优势，不少研究报道了将FBG-FP滤波器作为选模元件用于光纤激光器中实现单纵模激光输出。在全光通信中，对动态密集波分复用网络进行灵活控制管理的关键设备是可重构光分插复用器(ROADM)，它不仅可以有选择地对需要的光波长进行上下载，还可以通过调节输入光功率，使输出光信号达到动态增益均衡，从而实现密集波分复用信道的分插功能。本文根据DWDM系统对光纤可调谐滤波器的具体技术要求，深入分析和模拟研究了基于光纤布拉格光栅的可调谐窄带滤波器及其在DWDM系统中的应用。主要研究工作包括： (1)提出了一种基于多个FBG的全光纤型FP腔结构滤波器，目的在于改善单腔结构的滤波效果，通过对多腔FBG-FP结构透射特性进行详细的理论分析与数值仿真，得出结论：只要组成光栅的反射率提高，就可以增强谐振峰过渡带的滚降特性，当用于不同应用时，通过调节腔长可以得到所需的透射谐振峰线宽。与单个FBG-FP相比，多个光栅组成的FP腔具有更好的滤波特性。 (2)本文采用OptiSystem光通信软件对FBG-FP腔型可调谐滤波器在可调谐光纤激光器中的应用进行了分析与研究。结果表明，采用上述光纤Bragg光栅组合型可调谐滤波器可以实现光纤激光器单纵模激光的输出。 (3)设计了一种基于FBG-FP腔可调谐滤波器的新型ROADM，与以往FP型ROADM不同的是，该器件的输入端和下载端在同一侧，上载端和输出端口在另外一侧。经仿真分析研究，该器件的光功率损耗约为1dB，且各信道可达到动态增益均衡。 (4)针对光器件的特性，利用OptiSystem光通讯仿真软件对引入该ROADM的DWDM系统进行仿真，对整个系统的光学性能指标和功能特性进行测试和分析。对眼图和误码率的测试分析表明此种结构的ROADM符合设计标准，其应用对DWDM系统的影响不大，由此构成的DWDM系统功能达到设计要求，能够充分满足全光网络的需求。
[Abstract]:With the emergence and promotion of broadband integrated services such as cloud computing, Internet of things and HDTV, higher requirements for communication speed and stability have been put forward. The all-optical network based on DWDM avoids the cost of optoelectronic conversion. Breaking through the limitation of electronic bottleneck, it is the best scheme to solve the development of high-speed transmission service. To realize the high-speed transmission of DWDM all-optical network without bottleneck, it is required that the discrete devices are all-optical devices with high speed integration. Therefore, fiber Bragg gratings (FBG) have been widely concerned and deeply studied by the communication field because of their incomparable advantages. Fiber Bragg grating (FBG), which has been developed rapidly in recent years, is a new type of fiber passive device, which is widely used as wavelength selection and tuning element in tunable filters because of its advantages of being compatible with optical fiber communication systems to realize all-optical fiber conversion. Fabry-Perot (FBG-FP) structural devices based on fiber Bragg gratings (FBG) have shown great advantages. Many studies have reported that FBG-FP filters are used as mode selection elements to realize single longitudinal mode laser output in fiber lasers. In all optical communication, the key device for flexible control and management of dynamic dense wavelength division multiplexing network is the reconfigurable optical add / drop multiplexer (ROADM), which can not only selectively download the required wavelength, The dynamic gain equalization of the output optical signal can also be achieved by adjusting the input optical power, so as to realize the demultiplexing function of the dense wavelength division multiplexing (DWDM) channel. According to the technical requirements of fiber tunable filter in DWDM system, the tunable narrowband filter based on fiber Bragg grating and its application in DWDM system are analyzed and simulated in this paper. The main research works are as follows: (1) an all-fiber FP cavity filter based on multiple FBG is proposed, which aims to improve the filtering effect of single-cavity structure. Through the detailed theoretical analysis and numerical simulation of the transmission characteristics of multi-cavity FBG-FP structures, it is concluded that, as long as the reflectivity of the grating is increased, the rolling and dropping characteristics of the transition band of the resonant peak can be enhanced, and when used in different applications, By adjusting the cavity length, the required linewidth of the transmission resonance peak can be obtained. Compared with a single FBG-FP, the FP cavity composed of multiple gratings has better filtering performance. (2) the application of FBG-FP cavity tunable filter in tunable fiber laser is analyzed and studied by OptiSystem optical communication software. The results show that the single longitudinal mode laser output of fiber laser can be realized by using the fiber Bragg grating combined tunable filter. (3) A novel ROADM, based on FBG-FP cavity tunable filter is designed, which is different from FP type ROADM. The input end and download end of the device are on the same side, and the upload end and output port are on the other side. The simulation results show that the optical power loss of the device is about 1 dB and the dynamic gain equalization can be achieved in each channel. (4) according to the characteristics of optical devices, the OptiSystem optical communication simulation software is used to simulate the DWDM system introduced into the ROADM, and the optical performance and functional characteristics of the whole system are tested and analyzed. The test results of eye diagram and bit error rate show that the ROADM of this structure conforms to the design standard, and its application has little influence on DWDM system. The function of the resulting DWDM system can meet the design requirements and can fully meet the requirements of all-optical network.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN713;TN929.1

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