基于PPLN波导的全光4线-2线优先编码器
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摘要
全光网要在光域上实现信息的传输以及路由的交换,需要依靠全光逻辑器件来完成。但是由于已实现的全光逻辑器件功能较为单一,使得全光分组交换技术无法达到实用阶段。为开拓新的全光逻辑运算功能,在PPLN波导的和频+差频效应(SFG+DFG)基础上,提出了全光4线-2线优先编码器设计方案。首先根据PPLN波导的全光逻辑运算原理,分析4线-2线优先编码器的逻辑表达式,然后利用一个PPLN波导实现4线-2线优先编码器的高位输出,利用两个PPLN波导级联实现4线-2线优先编码器的低位输出。通过数值仿真得到信号波形和眼图,计算了消光比、脉冲宽度、半高全宽和峰值功率延迟时间,分析结果表明,本方案能在光域实现4线-2线优先编码器的逻辑功能,且输出信号质量较好,扩展了PPLN波导在全光逻辑信号处理方面的能力。
All optical network(AON) needs to rely on all optical logic devices to realize the transmission of information and the exchange of routing.However,all-optical packet switching technology has not been achieved due to immature all-optical logic devices.The all-optical 4-2 priority encoder is proposed based on sum-frequency generation and difference-frequency generation(SFG+DFG) of periodically poled lithium niobate(PPLN) waveguide to expand new all-optical logic operations.Firstly,the logic expressions of the 4-2 priority encoder are analyzed according to the principle of all-optical logic operation based on PPLN waveguide.The high output of the 4-2 priority encoder is obtained by using a single PPLN waveguide,and the low output of the 4-2 priority encoder is obtained by using two cascaded PPLN waveguides.The waveforms and the eye diagrams are obtained by numerical simulation,and the performance of the 4-2 priority encoder is analyzed by the parameters,such as extinction ratio,pulse width,full width half maximum(FWHM) and peak power delay time.The results show that the logic function of 4-2 priority encoder can be achieved in optical domain by this configuration which can guarantee the quality of the output signals and expand the capability of PPLN waveguide on the all-optical logic signal processing.
All optical network(AON) needs to rely on all optical logic devices to realize the transmission of information and the exchange of routing.However,all-optical packet switching technology has not been achieved due to immature all-optical logic devices.The all-optical 4-2 priority encoder is proposed based on sum-frequency generation and difference-frequency generation(SFG+DFG) of periodically poled lithium niobate(PPLN) waveguide to expand new all-optical logic operations.Firstly,the logic expressions of the 4-2 priority encoder are analyzed according to the principle of all-optical logic operation based on PPLN waveguide.The high output of the 4-2 priority encoder is obtained by using a single PPLN waveguide,and the low output of the 4-2 priority encoder is obtained by using two cascaded PPLN waveguides.The waveforms and the eye diagrams are obtained by numerical simulation,and the performance of the 4-2 priority encoder is analyzed by the parameters,such as extinction ratio,pulse width,full width half maximum(FWHM) and peak power delay time.The results show that the logic function of 4-2 priority encoder can be achieved in optical domain by this configuration which can guarantee the quality of the output signals and expand the capability of PPLN waveguide on the all-optical logic signal processing.
引文
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[2] DONG Yi,ZHAO Shang-hong,FANG Shao-qiang,et al.An optical regenerative wavelength conversion scheme on satellite based on nonlinearity of SOA[J].Journal of Optoelectronics·Laser,2015,26(4):688-694.董毅,赵尚弘,方绍强,等.一种基于SOA非线性效应的星上全光再生波长转换方案[J].光电子·激光,2015,26(4):688-694.
[3] LU Jia,CHANG Hai-yue,WANG Yang,et al.Multichannel transmission system based on all-optical wavelength conversion for dual single sideband discrete multitone signal[J].Laser & Optoelectronics Progress,2017,54(10):100603.卢嘉,常海悦,王杨,等.基于双单边带离散多音频信号全光波长变换的多路传输系统[J].激光与光电子学进展,2017,54(10):100603.
[4] LE Yan-si,WANG Zhi,LI Qiang,et al.Research of three mode fiber multiplexers and demultiplexers[J].Chinese Journal of Lasers,2016,43(6):0606004.乐燕思,王智,李强,等.光纤型三模式复用解用器的研究[J].中国激光,2016,43(6):0606004.
[5] SHENG Xiao-juan, DONG Xiao-wei, ZHANG Xiao-xing.Advances in the research on all-optical buffers[J].Study on Optical Communication,2011,37(6):52-55.盛晓娟,董小伟,张晓兴.全光缓存器的研究进展[J].光通信研究,2011,37(6):52-55.
[6] YING Xiang-yue,XU Tie-feng,LI Jun,et al.Photonic generation of millimeter-wave signal via frequency 16-tupling based on cascaded dual-parallel MZM[J].Journal of Optoelectronics·Laser,2017,28(11):1212-1217.应祥岳,徐铁峰,李军,等.基于级联双平行MZM的16倍频光生毫米波技术[J].光电子·激光,2017,28(11):1212-1217.
[7] XIE Xiao-bing,LI Shi-guang,ZHU Xiao-lei,et al.Characteristics of single resonant nanosecond pulse optical parametric oscillator with output wavelength of 2.05 μm[J].Chinese Journal of Lasers,2016,43(12):1208002.谢小兵,李世光,朱小磊,等.2.05 μm单谐振纳秒脉冲光参量振荡器特性研究[J].中国激光,2016,43(12):1208002.
[8] JIANG Shang-long,WU Bao-jian,SUN Fan,et al.Reshaping characteristics of multilevel all-optical amplitude regenerators[J].Laser & Optoelectronics Progress,2017,54(5):052303.蒋尚龙,武保剑,孙凡,等.多电平全光幅度再生器的整形特性[J].激光与光电子学进展,2017,54(5):052303.
[9] YIN Yu, YU Zhen-hong. Performance optimization of all-optical clock recovery based on F-P cavity by using chirped grating filter[J].Laser & Optoelectronics Progress,2016,53(11):110602.殷宇,余震虹.啁啾光栅对基于F-P腔全光时钟恢复性能的优化[J].激光与光电子学进展,2016,53(11):110602.
[10] XUE Ji-qiang,YU Jin-long,WANG Wen-rui,et al.Resear-ch of all-optical decision based on injection locked Fabry-Perot semiconductor laser[J].Journal of Optoelectronics·Laser,2016,27(1):6-11.薛纪强,于晋龙,王文睿,等.基于注入锁定法布里-珀罗激光器全光判决的研究[J].光电子·激光,2016,27(1):6-11.
[11] FAN Xin-lei,FU Song-nian,TANG Ming,et al.Optimization of light sampling coupler in all-optical multiple-input multiple-output signal processing[J].Acta Optica Sinica,2017,37(4):0406004.范鑫磊,付松年,唐明,等.全光多输入多输出信号处理中光采样耦合器的优化[J].光学学报,2017,37(4):0406004.
[12] SHEN Jing,QIN jin.Design for all-optical numeric comparator based on PPLN waveguides[J].Study on Optical Communication,2018,44(1):43-47.申静,秦晋.基于PPLN波导的全光数值比较器的设计[J].光通信研究,2018,44(1):43-47.
[13] SHEN Jing,QIN Jin.Design and investigation of all-optical data selector based on PPLN waveguides[J].Laser & Optoelectronics Progress,2018,55(5):052301.申静,秦晋.基于PPLN波导的全光数据选择器的设计与研究[J].激光与光电子学进展,2018,55(5):052301.
[14] WANG Jin-ren.The properties of the PPLN waveguide based on photorefractive two-wave coupling and cascaded second-order nonlinear effects[D].Harbin:Harbin Institute of Technology,2007,1-7.王锦仁.基于二波耦合和级联二阶非线性效应的PPLN波导特性研究[D].哈尔滨: 哈尔滨工业大学,2007,1-7.
[15] LIU Tao.Investigation of quasi-phase matching technology its applications[D].Beijing:Beijing University of Posts and Telecommunications,2009,24-25.刘涛.准相位匹配技术及其应用研究[D].北京: 北京邮电大学,2009,24-25.
[16] WANG Jun,SUN Jun-qiang,SUN Qi-zhen.Single-PPLN-based simultaneous half-adder,half-subtracter,and OR logic gate:proposal and simulation[J].Optics Express,2007,15(4):1690-1699.
[17] TANG Yu-bin,CHEN Yu-ping,JIANG Hao-wei,et al.Proposal for simultaneous all-optical AND,NOR,XNOR logic gates using QPM cascading nonlinear effects in two PPLNs[J].Chinese Optics Letters,2013,11(6):061901.
[18] DU Yong,ZHANG Guo-ping,WU Yun-hu,et al.Proposal and investigation of photonic data selector based on cross-phase modulation in highly nonlinear fiber[J].Optical Fiber Technology,2013,19(1):40-46.
[19] WEI Zhi-lu,WANG Hai-long,WANG Zhao-xiang,et al.Research of all-optical logic OR gate based on QD-SOA-XPM[J].Communications Technology,2017,50(4):630-635.韦志禄,王海龙,王兆祥,等.基于QD-SOA-XPM全光逻辑或门的研究[J].通信技术,2017,50(4):630-635.
[20] Dieter H Jundt.Temperature-dependent sellmeier equation for the index of refraction,ne,in congruent lithium niobate[J].Optics Letters,1997,22(20):1553-1555.