摘要
超长跨距无中继光传输系统具有端到端直达通路,与传统的光传输系统相比,线路中间无光放大器或光电转换器等中继设备,无需专门建设为其供电的中继站,建设与运营成本低。特别是对于我国目前进行建设的跨大区,特高压输电线路的配套光通信系统而言,可有效解决通信线路经过沙漠,沼泽,山区等无人区的问题,大幅度降低中继站的建设与维护成本。另外超长跨距无中继光传输系统还运用于石油管道输送,跨海峡与岛屿间海底光纤通信中。
本文针对超长跨距无中继光传输系统中的几种新型关键技术进行了理论与试验研究,重点研究了非线性抑制技术、遥泵放大技术、新型光纤技术以及新型码型技术。具体的研究工作如下:
(1)对光纤通信中受激布里渊散射(SBS)与自相位调制(SPM)效应进行了深入的理论与试验研究。提出了试验测试系统SBS阈值的方法,并通过试验验证了对信号进行相位调制能有效提高SBS阈值。通过试验证明了在大入纤功率情况下SPM效应会造成一定的通道代价,提出并验证了抑制SPM效应的两种方法。
(2)对遥泵放大器进行了理论与试验研究。提出了通过试验测试结合理论计算设计遥泵增益单元(RGU)在线路中最佳放置位置的算法,并通过试验验证了算法的准确性。
(3)对超低损耗光纤在长距传输中的应用进行了理论与试验研究,并通过试验验证了新型光纤相比于普通光纤对长距离传输性能上的改善。
(4)对新型码型中DPSK调制技术及平衡接收技术在长距传输中的应用进行了理论与试验研究,通过试验的方法验证了基于相位调制的DPSK码型对长距离传输性能的改善。
Compare to traditional optical transmission systems, ultra-long span Repeater-less optical transmission systems are characteristic of direct end to end routing without any line amplifier or repeater, which eliminate the need of power supply stations and thus reduce the construction and operating cost. Especially for the ongoing construction of long-span Ultra-High-Voltage transmission, the Repeater-less optical transmission systems can effectively avoid the repeaters in the routings through the no man's land such as deserts, swamps, mountains, thus largely cutting down the construction and maintenance costs of repeater stations. Additionally, the Repeater-less systems can be deployed at the oil pipeline transportation and submarine communication.
This paper focus on the research and experiment of advanced techniques in the ultra-long span Repeater-less optical transmission, especially the suppressing of non-linear effect in the fiber, remotely pumped amplifiers, ultra low loss optical fiber and advanced optical modulation formats. The following are the abstract contents:
(1) The theories and experiments of Stimulated Brillouin Scattering (SBS) and Self Phase Modulation (SPM) in the fiber are studied. The threshold of SBS is measured in experiment and increased greatly through externally phase modulation. Optical path penalty occurs at large launch power due to SPM. Two SPM suppressing methods are introduced.
(2) The theories and experiments of remotely pumped amplifier are studied. An experimental and theoretical algorithm for calculating the optimal position of RGU is introduced, which is testified by the experiment.
(3) Research and experiments on the application of ultra low loss optical fiber in ultra-long span optical transmission are introduced. It is proved that ultra low loss optical fiber takes obvious advantages over traditional fibers on the ultra-long transmission.
(4) Theoretical and experimental studies on advanced optical modulation formats, especially DPSK, are introduced. DPSK presents better performance over OOK in experiments.
引文
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