【作者】 王廷宇；

【导师】 于晋龙；

【作者基本信息】 天津大学 ， 通信与信息系统， 2010， 硕士

【摘要】 在超高速长距离光通信网中,全光时钟提取技术成为具有挑战性的热点研究领域,其对网络同步和全光3R再生等全光信号处理技术起着至关重要的作用。基于Fabry-Perot(F-P)滤波器的单波长及多波长时钟提取技术具有结构简单,时钟建立时间短等优点,F-P滤波器是无源线性储能器件,受外界干扰比较小。本文主要研究基于F-P滤波器的多波长时钟提取的理论基础、参数仿真及实验验证。主要内容包括:通过比较各种单波长及多波长时钟提取方案的优缺点及现有实验条件,提出基于F-P滤波器及SOA的时钟提取实验方案。对F-P滤波器的器件参数进行Matlab仿真,根据实际实验条件及要求,选择适当的F-P滤波器参数,以达到提取出高质量时钟的目的。主要分析F-P滤波器精细度对提取时钟的幅度抖动的影响,以及对长连零码幅度下降的影响。进行了基于F-P滤波器的单波长及双波长10GbpsRZ信号的时钟提取实验研究,并用单一SOA对提取出的时钟脉冲进行去幅度噪声的处理。在背靠背实验基础上,对恶化RZ信号也进行了时钟提取。实验结果表明,F-P滤波器对两路不同波长信号时钟提取的可行性,以及同一SOA同时处理双波长时钟的能力,两路的提取时钟的单边带相位噪声可分别达到-82.815dBc/Hz@10kHz和-83.072dBc/Hz@10kHz。为了对强度调制信号的幅度抖动进行处理,提出在高非线性光纤(HNLF)中利用自相位调制(SPM)效应抑制幅度噪声。通过强度调制信号进入HNLF中产生的SPM效应,注入恶化信号频谱被展宽,并通过后面的偏移滤波滤出再生信号,以达到去幅度噪声的作用。在理论分析的基础上,通过实验证实了基于SPM的10GbpsRZ信号的全光2R再生,从波形眼图上可看到明显的抑制0码和1码噪声效果。另外,还应用HNLF中的四波混频效应(FWM)对RZ信号进行波长变换实验研究,过滤出闲频光Idler作为波长变换信号。更多还原

【Abstract】 In the high-speed and long-haul all-optical networks, the all-optical clock extraction technique is a very challenging and hot research area, which is the key technique for the all-optical signal processing, such as the networking synchronization and 3R regeneration and so on. The technique of clock recovery, based on Fabry-Perot (F-P) filter, for single and multi-wavelength signals has lots of merits, like simple infrastructure and short time for clock building. Moreover, the F-P filter is an optical passive tank circuit. So it can be less influenced by the environment. This dissertation mainly focuses the research on the theory foundation, parameters simulation and experimental investigation of the multi-wavelength clock extraction based on F-P filter.Through comparing the advantages and disadvantages of kinds of single and multi-wavelength clock extraction techniques and the current experimental conditions, we propose the experimental investigation of the clock recovery based on F-P filter and a single SOA. We do the numerical simulation for F-P filter’s parameters by Matlab. We can choose the proper F-P filter for extracting the best clock signals based on the simulation and the experimental condition and demand. We compare the amplitude jitter of the extracted clock under different finesse and calculate their relative standard deviation (RSD). The dissertation also simulates the effects of finesse for the amplitude descent of long-continuous zeros code that is a key factor for the high-order pseudorandom code’s clock extraction.For the experimental investigation, we operate the experiment of single and multi-wavelength clock extraction for 10Gbps RZ signal, and we use a single SOA to suppress the amplitude noise. After operating the back-to-back experiment, we also extract the degraded signals’clock. Through the experiment, we demonstrate the possibility of recovering the clocks of two channels 10Gbps signals with different wavelength by F-P filter and the ability of single SOA to deal with two wavelengths clocks, and the phase noise of the two extracted clocks are -82.815dBc/Hz@10kHz and -83.072dBc/Hz@10kHz.For reducing the amplitude jitter of the intensity modulated signals, we propose another method, which is based on the self-phase modulation (SPM) effect in High Non-linear fiber (HNLF) with a subsequent optical filter at the shifted frequency compared to the input clock carrier frequency. Based on the theory analysis, we demonstrate the 2R regeneration for 10Gbps RZ signal by experiment. From the eye diagram of the degraded and regenerated signals, the amplitude noises of zero and one code are suppressed obviously. And, we take the experimental research on the wavelength conversion based on the four wave mixing (FWM) in HNLF, the idler of which is filtered as the new wavelength conversion signal.更多还原