编解码技术在安全光纤通信网络中的应用研究
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摘要
随着光纤通信网络容量的不断提升,光网络的安全性受到了广泛关注。光纤通信网络面临众多信息安全威胁,需要从网络的各个不同方面加强信息安全。本论文通过理论分析、仿真研究和实验验证等方法研究了编解码技术在安全光纤通信网络中的几种应用。
多用户OCDMA系统通过将不同用户的信息在光域编码后同时传输,从而避免窃听者直接获得特定用户信息。本论文研究了具有较高安全性的多用户光码分多址复用技术及系统。为了增加OCDMA系统用户数,我们提出了一种基于非线性偏振旋转的光阈值器。本文详细的分析了该阈值器的原理,并通过4个用户、每个用户2.5Gb/s的OCDMA实验验证了其能有效地抑制多用户串扰(MAI)。该阈值器具有大波长范围内(C波段)无色(Colorless)的特点,并且避免了超连续谱型光阈值器滤波引入的频谱切割噪声。
光隐匿通信技术通过将秘密信号隐藏在宿主通道中,避免窃听者发现隐匿传输的信号的存在,从而增强信息安全。本文提出了一维时域相位编码信号为隐匿信号,波分复用通道为宿主通道的光隐匿通信系统。本文通过仿真和实验系统的研究了一维时域相位编解码系统对谱域滤波的容忍度,并在此基础上提出采用凹陷滤波来抑制光隐匿通信系统中宿主通道信号对隐匿通道信号的串扰。本文通过实验演示了单个2.5Gb/s光隐匿通道和单个25Gb/s WDM光宿主通道的光隐匿通信系统。
光学虚拟私有网络(OVPN)利用现有的光网络硬件设施实现一个虚拟的私有网络,且能够结合网络高层的信息加密协议提供高安全性、低延时的信息传输。本论文提出基于线路编码谱域整形技术在时分复用无源光网络(TDM-PON)中提供OVPN新服务的方案。本方案能对老服务的用户不需做修改,从而实现有选择性的提供新服务。本论文提出了相应的通信协议,并通过实验和仿真研究验证了在155Mb/s上行的TDM-PON中提供2.5Gb/s OVPN服务的可行性。
随着“云”概念应用的普及,网络中点到点的安全通信技术越来越重要。本论文提出了采用超密集谱域相位编解码(UD-SPC)技术,并结合AES(?)口密的Gold序列和低密度奇偶校验(LDPC)技术,实现点到点的长距离、高安全性信息传输的方案。本文详细分析了基于码分多址编解码(CDM)和正交频分复用(OFDM)的UD-SPC的原理和AES加密得到的衍生Gold序列相关特性。本文验证了LDPC编码能有效地补偿衍生Gold序列间的码间串扰,从而增加同时传输的码字数目及通信速率。本论文提出了进一步提升系统安全性的循环移位的动态编解码方案,并分析了系统的安全性能。本文通过蒙特卡洛仿真研究了5.15Gb/s采用160个511码长衍生Gold序列的LDPC-UD-SPC系统背靠背和无色散光纤补偿传输200km及400km标准单模光纤的性能。
Network security of high-capacity fiber-optical networks has become an important issue. Various methods from different aspects have to be taken to cope with security threats the fiber-optical network faced. In this thesis, we present some applications of coding technologies to security-enhanced fiber-optical networks. Theoretical analysis together with system simulation and experimentations are carried out.
Multi-user optical code-division multiple-access (OCDMA) system transmits multiple optically encoded signals simultaneously. Therefore, the eavesdropper cannot get access to specific user information directly. Part of the thesis focuses on multi-user OCDMA system and subsystem technologies. We propose a novel optical thresholder based on nonlinear polarization rotation (NPR) to mitigate the multiple access interference (MAI). The theoretical analysis of the thresholder is presented. The effectiveness of the NPR thresholder is experimentally investigated in a4-user,2.5Gb/s per user OCDMA system. The NPR thresholder has the advantage of colorless operation over C bands and avoids the spectrum-slicing noise compared with the super-continuum based thresholder.
In optical stealth communication, the secure information is hided underneath the host channel signal to avoid the awareness of eavesdropper. We propose optical stealth transmission of temporal phase encoded (TPC) signal in a public WDM network. We systemically study the tolerance of1D TPC system to spectral filtering with simulation and experiments. Based on the above results, spectral notch filtering is proposed to reject the interference on stealth channel from host channel. We experimentally demonstrate a2.5Gb/s stealth transmission of TPC signal with a2.5Gb/s WDM channel.
Optical virtual private network (OVPN) technologies can provide low-latency and private communications with public network infrastructures. With some higher-layer encryption methods, a high-security OVPN service can be achieved. We propose to selectively provide OVPN service in a TDM-PON with spectral shaping line coding. In our scheme old service users are not affected. Corresponding protocol is also provided. The feasibility of providing2.5Gb/s OVPN service in155Mb/s upstream TDM-PON is investigated with simulation and experiments.
Secure point-to-point (P2P) communication is becoming increasingly important with the prevalent of so-called'cloud'based applications. We propose a long distance P2P secure transmission scheme with CDM and orthogonal frequency division multiplexing (OFDM) based ultra-dense spectral phase coding (UD-SPC) technology. The proposal also employs AES encrypted Gold (AES-Gold) sequences and low-density parity-check (LDPC) coding technology. The principle of UD-SPC system and the correlation property of AES-Gold sequences are presented. The LDPC coding can largely compensate the cross-talk among non-orthogonal AES-Gold sequences as shown by simulation. Therefore, with LDPC coding the number of simultaneously transmitted codes can be increased to increase the transmission rate. We also propose and analyze a dynamic encoding/decoding method with circularly shifted AES-Gold sequences. The performance of5.15Gb/s LDPC-UD-SPC system with160511-length AES-Gold sequences in back to back scenario as well as transmissions over200km and400km standard single mode fiber without fiber dispersion compensation scenarios are investigated by simulation.
多用户OCDMA系统通过将不同用户的信息在光域编码后同时传输,从而避免窃听者直接获得特定用户信息。本论文研究了具有较高安全性的多用户光码分多址复用技术及系统。为了增加OCDMA系统用户数,我们提出了一种基于非线性偏振旋转的光阈值器。本文详细的分析了该阈值器的原理,并通过4个用户、每个用户2.5Gb/s的OCDMA实验验证了其能有效地抑制多用户串扰(MAI)。该阈值器具有大波长范围内(C波段)无色(Colorless)的特点,并且避免了超连续谱型光阈值器滤波引入的频谱切割噪声。
光隐匿通信技术通过将秘密信号隐藏在宿主通道中,避免窃听者发现隐匿传输的信号的存在,从而增强信息安全。本文提出了一维时域相位编码信号为隐匿信号,波分复用通道为宿主通道的光隐匿通信系统。本文通过仿真和实验系统的研究了一维时域相位编解码系统对谱域滤波的容忍度,并在此基础上提出采用凹陷滤波来抑制光隐匿通信系统中宿主通道信号对隐匿通道信号的串扰。本文通过实验演示了单个2.5Gb/s光隐匿通道和单个25Gb/s WDM光宿主通道的光隐匿通信系统。
光学虚拟私有网络(OVPN)利用现有的光网络硬件设施实现一个虚拟的私有网络,且能够结合网络高层的信息加密协议提供高安全性、低延时的信息传输。本论文提出基于线路编码谱域整形技术在时分复用无源光网络(TDM-PON)中提供OVPN新服务的方案。本方案能对老服务的用户不需做修改,从而实现有选择性的提供新服务。本论文提出了相应的通信协议,并通过实验和仿真研究验证了在155Mb/s上行的TDM-PON中提供2.5Gb/s OVPN服务的可行性。
随着“云”概念应用的普及,网络中点到点的安全通信技术越来越重要。本论文提出了采用超密集谱域相位编解码(UD-SPC)技术,并结合AES(?)口密的Gold序列和低密度奇偶校验(LDPC)技术,实现点到点的长距离、高安全性信息传输的方案。本文详细分析了基于码分多址编解码(CDM)和正交频分复用(OFDM)的UD-SPC的原理和AES加密得到的衍生Gold序列相关特性。本文验证了LDPC编码能有效地补偿衍生Gold序列间的码间串扰,从而增加同时传输的码字数目及通信速率。本论文提出了进一步提升系统安全性的循环移位的动态编解码方案,并分析了系统的安全性能。本文通过蒙特卡洛仿真研究了5.15Gb/s采用160个511码长衍生Gold序列的LDPC-UD-SPC系统背靠背和无色散光纤补偿传输200km及400km标准单模光纤的性能。
Network security of high-capacity fiber-optical networks has become an important issue. Various methods from different aspects have to be taken to cope with security threats the fiber-optical network faced. In this thesis, we present some applications of coding technologies to security-enhanced fiber-optical networks. Theoretical analysis together with system simulation and experimentations are carried out.
Multi-user optical code-division multiple-access (OCDMA) system transmits multiple optically encoded signals simultaneously. Therefore, the eavesdropper cannot get access to specific user information directly. Part of the thesis focuses on multi-user OCDMA system and subsystem technologies. We propose a novel optical thresholder based on nonlinear polarization rotation (NPR) to mitigate the multiple access interference (MAI). The theoretical analysis of the thresholder is presented. The effectiveness of the NPR thresholder is experimentally investigated in a4-user,2.5Gb/s per user OCDMA system. The NPR thresholder has the advantage of colorless operation over C bands and avoids the spectrum-slicing noise compared with the super-continuum based thresholder.
In optical stealth communication, the secure information is hided underneath the host channel signal to avoid the awareness of eavesdropper. We propose optical stealth transmission of temporal phase encoded (TPC) signal in a public WDM network. We systemically study the tolerance of1D TPC system to spectral filtering with simulation and experiments. Based on the above results, spectral notch filtering is proposed to reject the interference on stealth channel from host channel. We experimentally demonstrate a2.5Gb/s stealth transmission of TPC signal with a2.5Gb/s WDM channel.
Optical virtual private network (OVPN) technologies can provide low-latency and private communications with public network infrastructures. With some higher-layer encryption methods, a high-security OVPN service can be achieved. We propose to selectively provide OVPN service in a TDM-PON with spectral shaping line coding. In our scheme old service users are not affected. Corresponding protocol is also provided. The feasibility of providing2.5Gb/s OVPN service in155Mb/s upstream TDM-PON is investigated with simulation and experiments.
Secure point-to-point (P2P) communication is becoming increasingly important with the prevalent of so-called'cloud'based applications. We propose a long distance P2P secure transmission scheme with CDM and orthogonal frequency division multiplexing (OFDM) based ultra-dense spectral phase coding (UD-SPC) technology. The proposal also employs AES encrypted Gold (AES-Gold) sequences and low-density parity-check (LDPC) coding technology. The principle of UD-SPC system and the correlation property of AES-Gold sequences are presented. The LDPC coding can largely compensate the cross-talk among non-orthogonal AES-Gold sequences as shown by simulation. Therefore, with LDPC coding the number of simultaneously transmitted codes can be increased to increase the transmission rate. We also propose and analyze a dynamic encoding/decoding method with circularly shifted AES-Gold sequences. The performance of5.15Gb/s LDPC-UD-SPC system with160511-length AES-Gold sequences in back to back scenario as well as transmissions over200km and400km standard single mode fiber without fiber dispersion compensation scenarios are investigated by simulation.
引文
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