【作者】 吕博；

【导师】 简水生；

【作者基本信息】 北京交通大学 ， 通信与信息系统， 2009， 博士

【摘要】 目前广泛采用的密集波分复用(DWDM)传输技术与光时分复用(OTDM)传输技术相结合,已逐渐成为现代通信干线网的主体,并正向超高速、超大容量和超长距离的全光通信网络发展。本论文围绕光传输和光交换两方面,结合国家自然科学基金重点项目“高速光通信系统中的偏振模色散补偿及其相关技术与基础研究”和“全光波长交换技术研究”以及国家863项目“160Gbit/s一泵多纤光传输技术的研究”的实施,针对光残余边带(VSB)调制码型的实现与性质研究、提高光时分复用系统光谱利用率技术、光栅滤波器设计算法以及新型分布式光路交换网的组网应用等方面进行了深入的理论分析和实验研究,所取得的主要成果如下:1.提出基于可调均匀Bragg光纤光栅产生残余边带调制码型的方案,建立了基于光阻带滤波器的VSB-NRZ/RZ码型调制格式的传输系统理论模型,分析了滤波器主要参数对VSB码型时域眼开度及频域边带抑止比的影响。其次在忽略了色散补偿光纤(DCF)与啁啾Bragg光纤光栅(CFBG)非理想特性的基础上,详细地分析了VSB-NRZ/RZ调制码型在基于DCF和CFBG色散补偿系统中的传输特性差异。在此基础上进一步分析了CFBG群时延纹波抖动对残余边带调制码型传输特性的影响。最后利用可调均匀Bragg光纤光栅产生的残余边带调制码型在试验室WDM光路交换试验网平台中做了试验验证。2.提出一种利用设计光匹配滤波器用以提高OTDM光谱利用率的方案。首先建立了基于皮秒光纤激光器的OTDM系统理论模型,通过对OTDM系统非理想特性的研究,系统地分析了OTDM各支路信号幅度的差异及抖动、时延差异与抖动对OTDM时频特性的影响。首次提出了通过设计解复用开关窗口的匹配光滤波器来提高OTDM信号频带利用率的方案,并利用阵列波导光栅(AWG)对4×10Gbit/sOTDM信号进行了光谱压缩,完成了时钟提取与解复用实验。实验结果表明进行光谱压缩以后的OTDM信号的频带利用率提高了约3倍,在传输100km之后仍可以进行时钟提取与解复用,验证了该方案的可行性。3.提出了一种插值搜索算法,利用该算法设计了光带通滤波器与低色散型带通滤波器,通过选取合适的插值函数得到了比传统GLM算法更优的结果。其次结合遗传算法对CFBG光栅性能做了优化,减小了CFBG的群时延纹波(GDR),从而验证了非对称切趾抑制带内群时延纹波的有效性。4.完善了基于光路交换的全光网演示系统的具体功能,优化了突发交换解决方案,减少了突发呼叫竞争。结合全光网组播技术,提出了一种适用于大规模网状光网络的多路分布式链路检测的解决方案。更多还原

【Abstract】 At present the combination of DWDM with OTDM techniques has gradually become the main part of backbone of modern communication networks,which is regarded as the development of the ultra-high speed,ultra high capacity and ultra long haul optical transmission communication networks.Optical transmission and optical switching are the two key aspects of optical communications.In this paper,supported by the key projects of National Natural Science Fondation "Research on PMD compensation and related infrastructure technologies in high speed optical communication systems","Study on all optical circuit switching technology" and National 863 project "Study on 160Gbit/s one pump multi-fiber optical transmission technology",we conduct a deep investigation into the theoretical and experimental research on the novel optical vestigial sideband(VSB) modulation formats,the increase of spectrum efficiency of OTDM,algorithm of grating fiber design and wavelength routing network applications.The main results achieved are as follows:1.The scheme of implimetation of optical vestigial sideband modulation formats with tunable uniform Bragg grating was proposed.The theoretical model of VSB-NRZ/RZ modulation system with optical bandstop filter was build.The main effects of EOP and the suppression ratio of sideband of VSB codes were analyzed induced by the parameters of optical filter.And then by negelecting the nonideal properties of DCF and CFBG,the differences of transmissions were analyzed in detail. A further analysis was made considering the effect of group delay ripple of CFBG in VSB transmission system.At last,an experiment of VSB modulation with tunable Bragg grating in all optical WDM network platforms was made to verify the feasibility of this proposal.2.For the first time,the scheme of the increase of spectrum efficiency of OTDM was investigated by employing matiching optical filter.The theoretical model of OTDM system based on picosecond pulse laser sources was build.The effects in time and spectrum domain of OTDM signals were discussed induced by these factors such as the difference of amplitude and vibration of amplitude and delay in each channel.The original proposal was made to increase the spectrum efficiency of OTDM by designing the matching filter of demultiplexing switching windows.Related experiments were made for the first time in which the 4×10Gbit/s OTDM signals were compressed by employing Arrey Waveguide Grating(AWG).Furthermore the clock extraction and demultiplexing of OTDM over 100 km transimsion were implemented as well.The experimental results show the increase of almost three times of spectrum efficiency comparing with the original OTDM singals which verified the feasibility of the scheme.3.A novel interpolation and searching algorithm was proposed,which designed and rebuild the optical bandpass and low dispersion filters.Better results were obtained by selcting proper interpolation functions comparing with that of tranditional GLM algorithm.And then optimization of CFBG was made by employing Genetic Algorithm (GA) to minimize the in-band group delay ripple(GDR) of CFBG,which verified the effectiveness of asymmetrical apodization scheme.4.Specific functional modules of all optical networks based on optical circuit switching were established and enhanced.The optimal scheme of burst contention was proposed Moreover combining with multicast technology,a novel scheme was investigated which was considered as the distributed and multi-link fault detections used in mesh and large scale optical networks.更多还原