共查询到19条相似文献,搜索用时 478 毫秒
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由DFB激光器的非简并四波混频(HNDFWM)数值模型,基于耦合波方程进行数值计算,讨论了影响四波混频效率的因素:失谐频率、泵浦光输出功率、DFB-LD的耦合系数及DFB-LD腔长.计算结果表明增大泵浦光功率、减小耦合系数、增加腔长能有效提高四波混频效率. 相似文献
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基于半导体光放大器的四波混频型全光波长转换器 总被引:4,自引:1,他引:3
本文报道了基于自行研制的半导体光放大器(SOA)的四波混频(FWM)型全光波长转换,采用环型腔掺铒光纤激光器(EDFL)作为泵浦源,实现了转换波长的连续可调。并就波长转换间距、光放大器的小信号增益和输入泵浦光功率对转换效率的影响进行了理论与实验分析,结果表明高的SOA增益和较大的输入泵浦光功率须利于转换效率的提高。 相似文献
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为了改善全光逻辑门的相位差特性,对全光逻辑异或门的相位差进行了研究。采用细化分段模型对量子点半导体光放大器的动态过程进行建模,利用牛顿法和4阶龙格-库塔法求解三能级跃迁速率方程以及光场传输方程,实现了基于量子点半导体光放大器马赫-曾德尔干涉仪结构的全光逻辑异或门;研究了有源区长度、最大模式增益、输入抽运光功率以及输入抽运光脉冲宽度对通过干涉仪两臂探测光相位差的影响,同时讨论了探测光的相位差与输出光功率的关系。结果表明,增大有源区长度、最大模式增益以及输入抽运光功率,均能使探测光相位差增大;随着抽运光脉冲宽度增大,探测光相位差先增大而后趋于平缓,之后不断减小;有源区长度为2.0mm、最大模式增益为3000m-1、输入抽运光功率为5dBm、抽运光脉冲宽度为1.0ps时,最大相位差增加至0.3277π;随着探测光相位差增大,输出光功率增大;通过优化参量可以增大探测光的相位差,而输出光功率会随着探测光相位差的增大而增大。该研究为提高转换信号质量提供了参考。 相似文献
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利用马赫-曾德尔干涉仪(Mach-Zehnder Interferometer,MZI)结构实现了基于量子点半导体光放大器(Quantum-Dot Semiconductor Optical Amplifier,QD-SOA)交叉相位调制(Cross-Phase Modulation,XPM)全光逻辑或门。变换光啁啾在一定程度上影响系统的传输性能与输出波形,通过求解跃迁速率方程,建立QD-SOA仿真模型,研究全光逻辑或门的啁啾特性,并仿真分析了有源区长度、背景光功率、脉冲宽度以及注入电流对啁啾的影响。结果表明:有源区长度设置在1.0~2.0 mm、背景光功率设置在小于0 dBm、脉冲宽度设置在1.0 ps左右,QD-SOA-XPM全光逻辑或门的性能较好。 相似文献
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H. Adachi K. Matsuda T. Chino J. Shibata 《Photonics Technology Letters, IEEE》1991,3(11):1013-1015
An optoelectronic exclusive-OR (XOR) gate operating with optical inputs and outputs was fabricated. The gate is based on an optoelectronic bistable switch consisting of a light emitting diode (LED) and a heterojunction phototransistor (HPT). The inverter function indispensable for the XOR logic is attained optically by connecting an additional HPT to the bistable switch in parallel. Successful operation of the XOR logic was demonstrated.<> 相似文献
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单双稳态转换逻辑单元(MOBILE)是基于共振隧穿二极管(RTD)电路的一个重要逻辑单元,非常适合阈值逻辑电路设计。由MOBILE可以构成阈值逻辑门(TG)和广义阈值逻辑门(GTG)等阈值逻辑电路。本文通过将三变量异或函数转化为较简单、理想的GTG输入输出函数形式,设计了由GTG构成的新型三变量异或门,并利用该三变量异或门设计了新型的全加器。通过HSPICE仿真和性能比较,该全加器不仅器件数量少,输出延时短,而且能达到较高的工作频率、更小的电路功耗与功耗-延迟积。 相似文献
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光网络缺少随机存储设备,难以独立于光电光变换实现线性网络编码技术.为了将网络编码技术引入到光网络中,提出一种能够在光域中实现的基于逻辑移位和逻辑异或运算的双路径网络编码机制.该网络编码机制比异或网络编码的通用性更强,并且能够在光域中独立于光电光变换实现,降低了实现代价.此外,针对提出的网络编码机制在实现过程中遇到的运算不封闭的问题,设计了能够承载该网络编码机制的网络编码节点模型,从而保证该网络编码机制能够在全光异或门和光移位寄存器等主要光器件的支持下在光网络中实施.最后,对该网络编码节点模型所涉及到的部分关键模块进行了实验分析,结果表明模块能够完成所期望的功能. 相似文献
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We have investigated the wavelength conversion techniques for differential phase-shift keying (DPSK) modulation formats in 10 Gb/s transmission systems, compared with the non-return-to-zero (NRZ) modulation format. For the wavelength conversion of DPSK modulation formats, we employed the wavelength converters based on the four-wave mixing (FWM) in semiconductor optical amplifiers (SOAs) and the frequency comb generated by phase modulation. The power penalty at 10/sup -9/ bit error rate was used as a measure of the system performance degraded by the wavelength conversion. Our simulation results show that the DPSK modulation formats have a smaller power penalty than the NRZ modulation format for the wavelength conversion using the FWM effect in an SOA due to a much lower pattern effect. However, as the wavelength conversion uses the frequency comb generated by phase modulation, it has a similar power penalty compared with the NRZ modulation format. It is also shown that the DPSK modulation formats are possible to obtain the power penalty less than 0.4 dB for both wavelength conversion techniques. 相似文献
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Theoretical analysis of gain-recovery time and chirp in QD-SOA 总被引:2,自引:0,他引:2
Y. Ben-Ezra M. Haridim B.I. Lembrikov 《Photonics Technology Letters, IEEE》2005,17(9):1803-1805
We present a theoretical analysis of the gain recovery and chirp characteristics of quantum-dot semiconductor optical amplifier (QD-SOA). We have derived an analytical expression for the frequency chirp in QD-SOA. The values of chirp and gain recovery time (GRT) for various signal power levels are calculated by numerical solution of the rate equations. The simulation results show that the chirp value in QD-SOA is approximately one order of magnitude lower than that in a bulk SOA. The dependences of the GRT and the chirp on the pump power level are studied. 相似文献