共查询到17条相似文献,搜索用时 156 毫秒
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全光加密技术是解决目前光纤通信网的加解密速率瓶颈及物理层潜在的安全威胁的有力保证。针对现有全光异或加解密方案工作速率普遍较低的问题,在传统的SOA-MZI型全光异或门的基础上,利用两段色散互补的G.655单模光纤,并结合一个相位偏移器设计了一种改进型SOA-MZI全光异或方案,以该改进方案作为全光安全处理器在OptiSystem7.0仿真平台上搭建新的全光异或加解密方案,对输入信号比特速率分别为10Gb/s和40Gb/s的加解密方案进行了仿真实验验证。结果表明:基于改进型SOA-MIZ全光异或门的加解密方案可将全光异或加解密速率提高到40Gb/s,并且解密恢复出的明文数据的消光比约可以达到20dB,最大Q值约为25.7,加解密过程不会对通信系统引入额外误码。 相似文献
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理论分析了SOA动态模型和SOA-MZI全光异或原理,采用光通信系统设计软件OptiSystem搭建了基于SOA-MZI的全光异或实验模型,仿真研究了注入SOA的数据信号光功率、连续探测光功率、偏置电流等工作条件对异或输出消光比、Q值以及误码性能的影响,取得了一组最佳工作条件,即数据信号光功率为3dBm,连续探测光功率为0dBm,偏置电流为600mA,此时可以得到最佳的异或输出性能:消光比约11.5dB,Q值约22,误码率约10-108量级。研究方法和相关结论可以推广到基于SOA的其他全光信号处理应用中,为未来全光网络的全面建设做准备。 相似文献
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基于光纤光参量放大的多通道全光非归零/归零码转换器 总被引:2,自引:0,他引:2
提出了一种基于光纤光参量放大器(FOPA)的多通道全光非归零码(NRZ)/归零码(RZ)调制格式转换的方案.该方案中,非归零码信号与同步的时钟抽运光共同注入到高非线性光纤(HNLF)中,由高非线性光纤构成的参量放大器把非归零码信号转换为归零码信号,同时不改变信号光的波长.多通道的码型转换器以两路10 Gb/s的非归零码进行了实验论证.转换后的归零码信号的信噪比(SNR)高于7.6 dB,其脉冲宽度约为30 ps,并且具有3dB的消光比(ER)提高.根据多通道码型转换器的实现原理,该码型转换器可以应用于40 Gb/s或更高比特率的多通道码型变换操作. 相似文献
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为了克服高比特率光信号实时取样时所面临的高速模数转换(ADC)限制,构建了一套基于高非线性光纤(HNLF)中四波混频效应的全光等效取样系统。全光取样系统主要包括取样脉冲信号产生、全光取样门和信号处理3部分,其中全光取样门为本系统的核心部分。取样脉冲和信号共同注入到HNLF中,基于四波混频效应实现全光取样。实验中,分别以10Gb/s、40Gb/s非归零OOK信号进行了取样实验验证。实验结果表明该取样系统可以实现高速光信号的取样过程。本文取样系统结构简单,且不受光信号速率的限制,可应用于更高速率的信号测量。 相似文献
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在光子防火墙中,为了实现能够有效处理高速光信号的全光模式匹配技术,针对BPSK信号提出了一种信号速率高达42 Gbit/s的全光模式匹配系统,并采用商用器件进行了实验验证。首先,通过给BPSK输入序列分别添加同相和反相的相干载波将BPSK信号转换为2个互为反向的强度调制(IM)信号;然后,通过延时线和由高非线性光纤(HNLF)实现的光学AND门进行相关操作;最后,输出表征全光模式匹配结果的高电平脉冲。仿真和实验结果表明,所提系统可以在8位的42 Gbit/s BPSK输入序列中识别出4位目标序列,验证了BPSK信号的全光模式匹配的可行性,适用于高速光子防火墙。 相似文献
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Joo-Youp Kim Jeung-Mo Kang Tae-Young Kim Sang-Kook Han 《Lightwave Technology, Journal of》2006,24(9):3392-3399
The authors have proposed, simulated, and experimentally demonstrated all-optical multiple logic gates using two parallel semiconductor optical amplifier (SOA)-Mach-Zehnder interferometer (MZI) structures that enable simultaneous operations of various logic functions of XOR, NOR, OR, and NAND. The proposed scheme, which is optimized by adjusting the optical gain and phase differences in SOA-MZI structures with creative and systematic method, has great merits to achieve the reshaped output pulses with high extinction ratio and enable the high-speed operation at over 10 Gb/s through performance enhancement of SOAs. Its validity is confirmed through simulation and experiments at 2.5 and 10 Gb/s, respectively. 相似文献
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A set-reset all-optical flip-flop(SR-AOFF) based on semiconductor optical amplifier Mach-Zehnder interferometer(SOA-MZI) is proposed. Simulation results show that low switching energy in the femto joule range, the transition time of less than 20 ps, high stability and high extinction ratio(ER) of 30 d B can be achieved, while AOFF output is power insensitive approximately. 相似文献
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An all-optical logic AND gate based on two-photon absorption (TPA) in semiconductor optical amplifier (SOA) is simulated. By solving the rate equations of SOA in the form of a Mach-Zehnder interferometer (MZI), the performance of AND gate is numerically investigated. The model takes the effects of amplified spontaneous emission (ASE) and pulse energy on the system’s quality factor (Q-factor) into account. Results show that the all-optical AND gate based on TPA in SOA-MZI based structure is feasible at 250 Gbit/s with a proper Q-factor. 相似文献
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基于级联半导体光放大器中交叉增益调制效应的新型全光逻辑与门 总被引:3,自引:3,他引:3
提出一种基于级联半导体光放大器(SOA)中的交叉增益调制(XGM)效应实现的全光逻辑与门新方案。该方案采用单端耦合半导体光放大器提高第一级半导体光放大器输出的消光比,合理控制第二级半导体光放大器的输入光功率,实现了两路2.5Gbit/s非归零(NRZ)信号的逻辑与运算。详细阐明了基于级联半导体光放大器的与门的工作原理和实验方案,分析了实验结果。根据实验结果,发现第一级半导体光放大器输出信号的消光比和信噪比对逻辑与运算结果影响较大,利用单端耦合半导体光放大器后能改善逻辑与运算结果,第二级半导体光放大器的输入抽运光功率对逻辑与运算输出的信号质量有较大的影响。合理控制这些因素,可以有效地提高该逻辑与门的输出特性。 相似文献
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N. Yan E. Tangdiongga H. D. Jung I. Tafur Monroy H. de Waardt A. M. J. Koonen 《Photonic Network Communications》2008,15(1):1-6
We experimentally demonstrate regenerative all-optical wavelength multicast by simultaneous multi-wavelength conversion of
10 Gb/s non-return-to-zero signals to four ITU 100 GHz spaced channels with a receiver sensitivity improvement of 1.84 dB
and less than 0.14 dB difference among all the multicast channels, using a single commercial monolithically integrated SOA-MZI.
The multicast device also exhibited about 22 dB optical signal-to-noise ratio enhancement for all the converted channels compared
to the original signal channel without wavelength conversion. Our experiment for the first time revealed the regeneration
properties of a SOA-MZI device for WDM wavelength multicast purposes, and proved the excellent performance of a simple scheme
for various future network and system applications, such as all-optical wavelength routing and grid networking. 相似文献
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ZHANG Wei QIU Kun LING Yun PANG Ying 《半导体光子学与技术》2007,47(1):63-68
A novel scheme of all-optical AND gate based on a Fabry-Perot semiconductor optical amplifier (FP-SOA) is proposed and its feasibility is verified by simulation. Using this scheme, all-optical AND gate can be realized with the extinction ratio of 10 dB. The influence of pulse interval and pulse width on the extinction ratio is also investigated. 相似文献