全光3R再生系统中的全光时钟提取技术研究
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摘要
光纤通信的两大发展趋势之一是主干传输向高速率、长距离的光传送网发展,最终实现全光网。光信号在传输过程中积累的各类损伤(衰减、色散、非线性效应)导致信号质量变差,限制了系统的传输速率和距离。全光3R(Re-amplifying,Re-shaping,Re-timing)再生技术能够很好的解决这一问题,而全光时钟提取是全光3R再生的核心技术。本论文围绕全光时钟提取展开了以下几方面的工作:
1.对全光时钟提取方案中的关键器件SOA进行了详细的理论分析,并通过仿真软件OptiSystem3.0模拟了基于SOA的交叉增益调制效应的波长变换,具体分析讨论了SOA在不同的控制光功率、连续光功率和偏置电流下的增益特性,通过40Gbps波长变换实验对仿真结果加以验证,为在时钟提取实验中合理有效地使用SOA提供了理论和实验依据。
2.以对主动锁模激光器锁模原理的介绍为基础,分析了注入锁模光纤激光器的工作原理;介绍了马赫-曾德干涉仪的基本结构和工作原理,分别从时域和频域分析了马赫-曾德干涉仪的传输特性,验证了其对提高时钟质量的作用,为基于注入锁模的时钟提取实验提供了理论基础。
3.进行了基于注入锁模的全光时钟提取实验。首先进行了10Gbps的时钟提取实验,得到了噪声性能很好的10GHz时钟脉冲的波形图和光谱图,并验证了马赫-曾德干涉仪的效果。然后进行了40Gbps的时钟提取实验,成功地从40Gbps伪随机信号中提取出质量较好的40GHz时钟脉冲。最后,通过改变实验中的注入信号功率、SOA偏置电流和滤波器中心波长,比较了不同参数条件下提取出的时钟信号的效果,为优化各个参数提供了实验依据。
4.进行了基于UNI的时钟提取实验。首先介绍了UNI的基本工作原理,并从琼斯矩阵和传输函数两个角度加以理论分析。然后介绍了将UNI应用于时钟提取的方案,进行了基于UNI的10Gbps时钟提取实验,得到波形较好的10GHz时钟脉冲,并分别改变控制光功率、SOA偏置电流、EDFA工作电流等参数,观察其对时钟质量的影响。最后进行了40Gbps的时钟提取实验,得到了40GHz时钟脉冲的波形图和光谱图。
One of the two development trends in optical communication isoptical-transfer-network (OTN), even all-optical-network (AOC) with high speed andlong haul. The optical signals will be degraded by many factors, which limit thetransmission capacity and distance. This problem can be well solved by usingall-optical 3R regeneration. Clock recovery is a key technology in all-optical 3Rregeneration. In this paper, we spread our work on injection mode-locked clockextraction in following aspects.
1. As the key component of clock recovery, SOA is studied theoretically in detail.The characteristics of SOA-XGM are emulated using software Optisystem3.0.Then we complete the experiment of 40Gbps wavelength conversion, from whichwe validate the simulation results. So that we make the theoretical andexperimental foundations on using SOA effectively in clock recovery.
2. Base on the analysis of active mode-locked fiber laser, we demonstrate theprinciple of injection mode-locked fiber laser. We also introduce the basicstructure and principle of the Mach-Zehnder interferometer (MZI), and investigateits transmission functions both in time domain and frequency domain. Thesesupport the injection mode-locked clock recovery in theory.
3. We carry out the experiments of all-optical clock recovery based on injectionmode-locked laser. At first, we complete 10Gbps clock extraction and get thewaveform and spectrum figures with good characteristics, from which the effectof MZI be proved. Then we successfully extract 40Hz clock pulses from 40Gbpspseudo-random signals. Changing the injection signal power, the bias current ofthe SOA and the central wavelength of the filter, and we get the differentexperimental effects of the clock signals.
4. We perform the clock extraction experiments utilizing an ultrafast nonlinearinterferometer (UNI). First, We introduce the basic work principle of the UNIthrough the analysis of the Jones Matrix and the transmission function. Then wedemonstrate the clock recovery scheme using the UNI, and achieve the10Gbps/40Gbps clock recovery. At the same time, we observe the different clockwaveforms under the different conditions, such as the control signal power, thebias current of the SOA and the work current of the EDFA.
1.对全光时钟提取方案中的关键器件SOA进行了详细的理论分析,并通过仿真软件OptiSystem3.0模拟了基于SOA的交叉增益调制效应的波长变换,具体分析讨论了SOA在不同的控制光功率、连续光功率和偏置电流下的增益特性,通过40Gbps波长变换实验对仿真结果加以验证,为在时钟提取实验中合理有效地使用SOA提供了理论和实验依据。
2.以对主动锁模激光器锁模原理的介绍为基础,分析了注入锁模光纤激光器的工作原理;介绍了马赫-曾德干涉仪的基本结构和工作原理,分别从时域和频域分析了马赫-曾德干涉仪的传输特性,验证了其对提高时钟质量的作用,为基于注入锁模的时钟提取实验提供了理论基础。
3.进行了基于注入锁模的全光时钟提取实验。首先进行了10Gbps的时钟提取实验,得到了噪声性能很好的10GHz时钟脉冲的波形图和光谱图,并验证了马赫-曾德干涉仪的效果。然后进行了40Gbps的时钟提取实验,成功地从40Gbps伪随机信号中提取出质量较好的40GHz时钟脉冲。最后,通过改变实验中的注入信号功率、SOA偏置电流和滤波器中心波长,比较了不同参数条件下提取出的时钟信号的效果,为优化各个参数提供了实验依据。
4.进行了基于UNI的时钟提取实验。首先介绍了UNI的基本工作原理,并从琼斯矩阵和传输函数两个角度加以理论分析。然后介绍了将UNI应用于时钟提取的方案,进行了基于UNI的10Gbps时钟提取实验,得到波形较好的10GHz时钟脉冲,并分别改变控制光功率、SOA偏置电流、EDFA工作电流等参数,观察其对时钟质量的影响。最后进行了40Gbps的时钟提取实验,得到了40GHz时钟脉冲的波形图和光谱图。
One of the two development trends in optical communication isoptical-transfer-network (OTN), even all-optical-network (AOC) with high speed andlong haul. The optical signals will be degraded by many factors, which limit thetransmission capacity and distance. This problem can be well solved by usingall-optical 3R regeneration. Clock recovery is a key technology in all-optical 3Rregeneration. In this paper, we spread our work on injection mode-locked clockextraction in following aspects.
1. As the key component of clock recovery, SOA is studied theoretically in detail.The characteristics of SOA-XGM are emulated using software Optisystem3.0.Then we complete the experiment of 40Gbps wavelength conversion, from whichwe validate the simulation results. So that we make the theoretical andexperimental foundations on using SOA effectively in clock recovery.
2. Base on the analysis of active mode-locked fiber laser, we demonstrate theprinciple of injection mode-locked fiber laser. We also introduce the basicstructure and principle of the Mach-Zehnder interferometer (MZI), and investigateits transmission functions both in time domain and frequency domain. Thesesupport the injection mode-locked clock recovery in theory.
3. We carry out the experiments of all-optical clock recovery based on injectionmode-locked laser. At first, we complete 10Gbps clock extraction and get thewaveform and spectrum figures with good characteristics, from which the effectof MZI be proved. Then we successfully extract 40Hz clock pulses from 40Gbpspseudo-random signals. Changing the injection signal power, the bias current ofthe SOA and the central wavelength of the filter, and we get the differentexperimental effects of the clock signals.
4. We perform the clock extraction experiments utilizing an ultrafast nonlinearinterferometer (UNI). First, We introduce the basic work principle of the UNIthrough the analysis of the Jones Matrix and the transmission function. Then wedemonstrate the clock recovery scheme using the UNI, and achieve the10Gbps/40Gbps clock recovery. At the same time, we observe the different clockwaveforms under the different conditions, such as the control signal power, thebias current of the SOA and the work current of the EDFA.
引文
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[6] T. N. Nielsen, A. J. Stentz, K. Rottwitt, et al., 3.28-Tb/s (82×40Gb/s) Transmission Over a 3×100km Nonzero-Dispersion Fiber Using Dual C-and L-Band Hybrid Raman/Erbium-doped Inline Amplifiers, OFC'2000, PD23
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[8] Sergio Tsuda and Valeria L. da Silva, Transmission of 80×10Gbit/s WDM channels with 50GHz spacing over 500km of LEAF fiber, OFC'2000, Tuj6-1
[9] Susumu Kinoshita, Broadband fiber optic amplifiers, OFC'2001, TuA1
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