超高速光通信系统关键技术研究及其系统实现
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摘要
随着网络技术和信息技术的飞速发展,宽带网络逐渐普及;各种占用大量网络资源的新型网络应用不断涌现,使得因特网网络流量几乎每两年翻一番。现有的光通信网络受制于电子器件“电子瓶颈”的限制,单波长传输速率商用最高可达40GBit/s。为了提高传输网络传输能力和核心节点信息处理能力,必须开展新型的超高速光通信网络研究。本论文针对超高速全光网络中的关键技术以及影响网络性能的关键问题进行了研究,研究内容包括超短光脉冲产生、全光波长变换、超高速全光OTDM系统复用/解复用,以及光交换网络结构等。
具体研究成果与创新如下:
1、首次在线性腔主动锁模光纤激光器线性腔内内采用半导体光放大器(SOA)作为增益介质和锁模器件,实现了基于半导体光放大器的线性腔主动锁模光纤激光器。该线性腔锁模光纤激光器谐振腔内无波长选择器件,腔型结构简单,输出锁模脉冲性能稳定。实验中实现了重复频率为10GHz,脉冲宽度为6.8ps的脉冲输出,输出脉冲的时域抖动为60fs。谐振腔腔长短,输出光脉冲性能稳定。通过调节外部注入脉冲,输出的锁模脉冲能够宽波长调节范围(1528nm-1565nm)、宽重复率范围(3GHz-10GHz)内进行调节。
2、利用外部注入脉冲同向注入到锁模激光器环型腔,实现了重复频率为10GHz,脉冲宽度为6ps的直接脉冲输出。该锁模激光器输出脉冲能够实现中心波长1530nm到1565nm可调,重复频率从1GHz到15Ghz可调。从实验测试方面,详细分析了锁模激光器环型腔内部参数,以及外部注入光参数对于该主动锁模光纤激光器输出脉冲的影响。基于该环型腔,对外部脉冲进行时域复制,实现了重复频率为40GHz的主动锁模光纤激光器。
3、利用SOA内交叉增益调制和交叉相位调制效应,实现了速率为80Gbit/s极性保持的全光波长变换器。该波长变换器能够实现宽范围的波长变换,固定信号光中心波长为1550nm,实现了1530nm到1548nm可调范围的波长下变换以及1555nm到1565nm可调范围的波长上变换。变换输出信号与输入信号极性相同,对于输入信号的偏振态不敏感。为了优化该波长变换器的波长变换效果,分析了波长变换输出性能与滤波器相对探索光中心波长的偏移之间的关系,以及输入信号功率对于波长变换效率的影响。
4、基于SOA的四波混频效应,利用单只SOA实现了80Gbit/s到10Gbit/s全光解压缩实验。通过测试,该解压缩系统可以无误码运行,在系统误码率为10~(-9)时,系统的功率代价最高为3.5dB。通过误码测试系统,分析了该解压缩系统输入信号光功率对于系统误码性能的影响。通过对接收信号功率进行优化,能够提高该系统的性能。
5、利用维持-阻塞D触发器首次实现了40Gbit/s到10Gbit/s的解压缩实验。该解压缩方案性能稳定,解压缩各路信号误码性能一致。该解压缩方案在对信号解压缩的同时能够实现对归零码(RZ)到非归零码(NRZ)的变换。
6、基于高速的全光波长变换器以及全光压缩/解压缩系统关键技术,搭建了一套三节点,速率为80Gbit/s的基于波长地址的超高速全光交换网络实验演示系统。该全光交换网络结合了超高速OTDM系统的大容量传输特性以及全光线路交换的透明传输特性,能够实现超高速的全光交换。
With the rapid developments of the internet technology and information technology, the broadband networks become widespread in the world. A variety of new emerging network applications occupy a large number of network bandwidth, making Internet traffic doubling almost every two years. Due to the limits of "electronic bottleneck" of the used electronic device in existing optical communications networks, the highest commercial single-wavelength transmission rate is limited up to 40GBit / s. In order to improve the transmission capacity of transmission and information processing capability of core network nodes, new types of ultra-high-speed optical communication network should be studied extensively. This dissertation focuses on investigations of key technologies and issues in ultrahigh-speed photonics networks, included ultra-short-pulse generation technology, all optical wavelength conversion, ultra-fast multiplexing/demultiplexing systems and all optical switching network structures. The research work and results are summarized as follows:
1. A linear cavity actively mode-locked fiber laser is demonstrated with a semiconductor optical amplifier (SOA) employing in the cavity. Without wavelength selective device in the cavity, the demonstrated mode-locked laser shows a very simple cavity configuration. A pulse train with pulsewidth about 6.8ps in a wide wavelength tunable span (1528 nm to 1565 nm) and a wide repetition tunable span (3 GHz to 10 GHz) is achieved successfully. The generated pulses show a low timing jitter about 60 fs.
2. By injecting an external pulse forwardly into a ring cavity, an actively mode-locked fiber ring laser is demonstrated. Without any extral pulse compression, a pulse train with pulsewidth about 6ps is achieved with low timing jitter about 70fs. The mode-locked fiber laser presents a wide wavelength tunable span (1530nm-1565nm) and a wide repetition tunable span (1 GHz-15 GHz). A detailed experimentally research is done to investigate the relationship between the pulsewidth of generated pulse trains with the parameters of cavity and external pulse sequence.
3. 80 Gbit/s error-free polarity-preserved wavelength conversion was achieved by implementing cross gain modulation (XGM)/cross phase modulation (XPM) in an SOA in conjunction with shifted filtering. In contrast to other wavelength conversion schemes, the technique presented is advantageous in that the polarity of the output signal is preserved, the scheme exhibits polarization independence, and the set-up has a very simple configuration. In order to improve the performance of wavelength conversion, we analyze the impact of the shift between the wavelength of probe light and the central wavelength of OBPF.
4. Base on the four-wave mixing effect in SOA, all-optical demultiplexing from 80Gbit/s to 10Gbit/s is achieved with a single SOA. The demultiplexing system can operate without bit error. For a 10~(-9) bit error rate, the maximum power penalty is 3.5dB. In addition, an experimental analysis is done for the impact of input power of signal light on the bit error performance of the demultiplexing system.
5. A new de-multiplexing scheme is proposed with a high-speed remain-block D flip-flop. This scheme shows a lot of advantages, such as signal regeneration, RZ-NRZ conversion, and stable operation. With this new scheme, a 10Gbit/s signal is de-multiplexed from a 40Gbit/s signal successfully.
6. By combining the transparency of optical circuit switching networks and the large transmission capacity of optical time division multiplexing (OTDM) networks, an 80Gbit/s wavelength-routed all-optical switching networks is demonstrated based on high performance all-optical wavelength converter.
具体研究成果与创新如下:
1、首次在线性腔主动锁模光纤激光器线性腔内内采用半导体光放大器(SOA)作为增益介质和锁模器件,实现了基于半导体光放大器的线性腔主动锁模光纤激光器。该线性腔锁模光纤激光器谐振腔内无波长选择器件,腔型结构简单,输出锁模脉冲性能稳定。实验中实现了重复频率为10GHz,脉冲宽度为6.8ps的脉冲输出,输出脉冲的时域抖动为60fs。谐振腔腔长短,输出光脉冲性能稳定。通过调节外部注入脉冲,输出的锁模脉冲能够宽波长调节范围(1528nm-1565nm)、宽重复率范围(3GHz-10GHz)内进行调节。
2、利用外部注入脉冲同向注入到锁模激光器环型腔,实现了重复频率为10GHz,脉冲宽度为6ps的直接脉冲输出。该锁模激光器输出脉冲能够实现中心波长1530nm到1565nm可调,重复频率从1GHz到15Ghz可调。从实验测试方面,详细分析了锁模激光器环型腔内部参数,以及外部注入光参数对于该主动锁模光纤激光器输出脉冲的影响。基于该环型腔,对外部脉冲进行时域复制,实现了重复频率为40GHz的主动锁模光纤激光器。
3、利用SOA内交叉增益调制和交叉相位调制效应,实现了速率为80Gbit/s极性保持的全光波长变换器。该波长变换器能够实现宽范围的波长变换,固定信号光中心波长为1550nm,实现了1530nm到1548nm可调范围的波长下变换以及1555nm到1565nm可调范围的波长上变换。变换输出信号与输入信号极性相同,对于输入信号的偏振态不敏感。为了优化该波长变换器的波长变换效果,分析了波长变换输出性能与滤波器相对探索光中心波长的偏移之间的关系,以及输入信号功率对于波长变换效率的影响。
4、基于SOA的四波混频效应,利用单只SOA实现了80Gbit/s到10Gbit/s全光解压缩实验。通过测试,该解压缩系统可以无误码运行,在系统误码率为10~(-9)时,系统的功率代价最高为3.5dB。通过误码测试系统,分析了该解压缩系统输入信号光功率对于系统误码性能的影响。通过对接收信号功率进行优化,能够提高该系统的性能。
5、利用维持-阻塞D触发器首次实现了40Gbit/s到10Gbit/s的解压缩实验。该解压缩方案性能稳定,解压缩各路信号误码性能一致。该解压缩方案在对信号解压缩的同时能够实现对归零码(RZ)到非归零码(NRZ)的变换。
6、基于高速的全光波长变换器以及全光压缩/解压缩系统关键技术,搭建了一套三节点,速率为80Gbit/s的基于波长地址的超高速全光交换网络实验演示系统。该全光交换网络结合了超高速OTDM系统的大容量传输特性以及全光线路交换的透明传输特性,能够实现超高速的全光交换。
With the rapid developments of the internet technology and information technology, the broadband networks become widespread in the world. A variety of new emerging network applications occupy a large number of network bandwidth, making Internet traffic doubling almost every two years. Due to the limits of "electronic bottleneck" of the used electronic device in existing optical communications networks, the highest commercial single-wavelength transmission rate is limited up to 40GBit / s. In order to improve the transmission capacity of transmission and information processing capability of core network nodes, new types of ultra-high-speed optical communication network should be studied extensively. This dissertation focuses on investigations of key technologies and issues in ultrahigh-speed photonics networks, included ultra-short-pulse generation technology, all optical wavelength conversion, ultra-fast multiplexing/demultiplexing systems and all optical switching network structures. The research work and results are summarized as follows:
1. A linear cavity actively mode-locked fiber laser is demonstrated with a semiconductor optical amplifier (SOA) employing in the cavity. Without wavelength selective device in the cavity, the demonstrated mode-locked laser shows a very simple cavity configuration. A pulse train with pulsewidth about 6.8ps in a wide wavelength tunable span (1528 nm to 1565 nm) and a wide repetition tunable span (3 GHz to 10 GHz) is achieved successfully. The generated pulses show a low timing jitter about 60 fs.
2. By injecting an external pulse forwardly into a ring cavity, an actively mode-locked fiber ring laser is demonstrated. Without any extral pulse compression, a pulse train with pulsewidth about 6ps is achieved with low timing jitter about 70fs. The mode-locked fiber laser presents a wide wavelength tunable span (1530nm-1565nm) and a wide repetition tunable span (1 GHz-15 GHz). A detailed experimentally research is done to investigate the relationship between the pulsewidth of generated pulse trains with the parameters of cavity and external pulse sequence.
3. 80 Gbit/s error-free polarity-preserved wavelength conversion was achieved by implementing cross gain modulation (XGM)/cross phase modulation (XPM) in an SOA in conjunction with shifted filtering. In contrast to other wavelength conversion schemes, the technique presented is advantageous in that the polarity of the output signal is preserved, the scheme exhibits polarization independence, and the set-up has a very simple configuration. In order to improve the performance of wavelength conversion, we analyze the impact of the shift between the wavelength of probe light and the central wavelength of OBPF.
4. Base on the four-wave mixing effect in SOA, all-optical demultiplexing from 80Gbit/s to 10Gbit/s is achieved with a single SOA. The demultiplexing system can operate without bit error. For a 10~(-9) bit error rate, the maximum power penalty is 3.5dB. In addition, an experimental analysis is done for the impact of input power of signal light on the bit error performance of the demultiplexing system.
5. A new de-multiplexing scheme is proposed with a high-speed remain-block D flip-flop. This scheme shows a lot of advantages, such as signal regeneration, RZ-NRZ conversion, and stable operation. With this new scheme, a 10Gbit/s signal is de-multiplexed from a 40Gbit/s signal successfully.
6. By combining the transparency of optical circuit switching networks and the large transmission capacity of optical time division multiplexing (OTDM) networks, an 80Gbit/s wavelength-routed all-optical switching networks is demonstrated based on high performance all-optical wavelength converter.
引文
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