南京邮电大学电子与光学工程学院、微电子学院，江苏 南京 210023
在完整的二维三角晶格硅中引入线缺陷和点缺陷，利用波导耦合和线性干涉，提出了一种基于光子晶体的全光半加器结构。半加器由波导分束器、全光逻辑与门和全光逻辑异或门组成。利用Rsoft软件，结合平面波展开法和时域有限差分法对所提半加器进行仿真研究。结果表明，所提半加器在波长为1530 nm时“进位”和“和位”端口的对比度分别为4.67 dB和10.77 dB，响应时间约为2.67 ps。为了提高“进位”端口的对比度，文中对半加器的结构进行了优化。优化后的半加器“进位”和“和位”端口的对比度分别为8.26 dB和15.34 dB，响应时间为3.67 ps，理论上可以达到0.273 Tbps的数据传输速率。所提出优化后的半加器具有较高的对比度，在全光信号处理系统和集成光路中具有重要作用。
光学器件 光逻辑器件 半加器 光子晶体 激光与光电子学进展
2022, 59(1): 0123001
沈阳工业大学 信息科学与工程学院, 沈阳 110870
随着互联网的发展, 网络数据流量极速增长, 全光网(AON)概念的提出有利于解决可用带宽受限、信号传输速率较低等问题。其中, 全光逻辑信号处理为AON的重要组成部分。根据周期性极化铌酸锂(PPLN)波导的二阶非线性效应原理, 将产生的输出信号连续送入不同的PPLN波导进行叠加处理, 设计出全光2线-4线译码器的波导级联结构, 通过数值计算仿真得到了波形图和眼图, 分析了全光2线-4线译码器输出信号的半高全宽(FWHM)、峰值功率、延迟时间和消光比。仿真结果表明: 采用PPLN波导级联的方式实现了2线-4线译码器在光域中的逻辑功能, 同时保证了光信号的传输质量, 为PPLN波导的全光信号处理提供了新的器件类型。
光逻辑器件 全光2线-4线译码器 波导级联 周期性极化铌酸锂波导 全光信号处理 optical logic devices all-optical 2-4 line decoder waveguide cascade periodically poled lithium niobate waveguide all-optical signal processing
Author Affiliations
Abstract
State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
In this Letter, an all-optical logic sequence generator based on two different polarization holographic gratings has been proposed and demonstrated, which has one input port and four output ports. The polarization state of input light signal determines logic output signals. It can produce four kinds of logic sequence output signals: 1000, 0100, 0010, and 0001, corresponding to the input light signal of four different polarization states: the p-linear, s-linear, left-handed circular, and right-handed circular. The two polarization gratings have been fabricated, and the working principle of the logic sequence generator has been proved by diffraction pattern analysis of polarization gratings.
230.1150 All-optical devices 230.3750 Optical logic devices 050.2770 Gratings Chinese Optics Letters
2019, 17(8): 082302
Author Affiliations
Abstract
State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
All-optical logic gates including AND, XOR, and NOT gates, as well as a half-adder, are realized based on two-dimensional lithium niobate photonic crystal (PhC) circuits with PhC micro-cavities. The proposed all-optical devices have an extinction ratio as high as 23 dB due to the effective all-optical switch function induced by two-missing-hole micro-cavities. These proposed devices can have potential implementation of complex integrated optical functionalities including all-optical computing in a lithium niobate slab or thin film.
230.3750 Optical logic devices 230.5298 Photonic crystals Chinese Optics Letters
2019, 17(7): 072301
Author Affiliations
Abstract
A novel ultrahigh-speed all-optical demultiplexer (DMUX) with polarization-shift-keying (PolSK) modulation input signals is proposed. This design is based on four-wave mixing (FWM) in a semiconductor optical amplifier (SOA). For analyzing each amplifier, we use finite-difference method (FDM) based on solution of the traveling wave coupled equations. Using numerical simulation, the all-optical DMUX is theoretically realized at 40 Gb/s. We also study the relation between optical confinement factor and thickness of active layer of the SOA section successfully, and investigate the increasing effect of confinement factor on the DMUX optical output power. With this work, the confinement factor is increased from 0.3 to 0.48, and as a result, the output power approximately twice ofits initial value is achieved. Moreover, the effects of polarization dependence of SOA on the output performance of all-optical DMUX for PolSK signal are theoretically investigated in detail.
190.4380 Nonlinear optics, four-wave mixing 230.3750 Optical logic devices 230.4480 Optical amplifiers 230.5440 Polarization-selective devices Chinese Optics Letters
2012, 10(9): 091902
Author Affiliations
Abstract
State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
We demonstrate an all-optical reconfigurable logic gate based on dominant nonlinear polarization rotation accompanied with cross-gain modulation effect in a single semiconductor optical amplifier (SOA). Five logic functions, including NOT, OR, NOR, AND, and NAND, are realized using 10-Gb/s on-off keying signals with flexible wavelength tunability. The operation principle is explained in detail. By adjusting polarization controllers, multiple logic functions corresponding to different input polarization states are separately achieved using a single SOA with high flexibility.
半导体光放大器 逻辑门 可重构 光信号处理 060.4510 Optical communications 250.3750 Optical logic devices Chinese Optics Letters
2011, 9(3): 030603
Author Affiliations
Abstract
1 Department of Electronic and Electrical Engineering, University of Bristol, Bristol, BS8 1UB, UK
2 Visiting State Key Laboratory of ASIC and Department of Communications Engineering, School of Information Science and Engineering, Fudan University, Shanghai 200433, China
Semiconductor ring laser (SRL) has been shown to possess robust bistability between its two possible directions, i.e., clockwise (cw) and counter-clockwise (ccw) lasing, routinely demonstrating directional extinction ratio (DER) of > 25 dB. In this paper, experimental schemes and results using the SRL as a universal photonic digital element to form all-optical logic, memory, and signal processing circuits are summarized. It is demonstrated that the SRL can be used for both combinatorial and sequential logic functions, and as all-optical regeneration devices. Furthermore, it is shown that a SRL logic circuit can be all-optically reconfigured to perform different all-optical logic functions.
半导体环形激光器 全光逻辑 全光开关 全光信号处理 130.3750 Optical logic devices 140.3560 Lasers, ring 140.5960 Semiconductor lasers 130.4815 Optical switching devices 130.3120 Integrated optics devices Chinese Optics Letters
2010, 8(9): 918
Author Affiliations
Abstract
1 Electronic Information Institute, Hangzhou Dianzi University, Hangzhou 310018
2 College of Optical and Electronic Science, China Jiliang University, Hangzhou 310018
Based on the weakly coupled-mode theory, the coupled-mode equations of the spatial multiwaveguide system are presented in general. The intensity distribution in each waveguide is determined by numerical method. Optical logic devices based on spatial multiwaveguide system are proposed. The analysis results show that the spatial multiwaveguide system permits different Boolean logic states obtained by phase modulation. Applications of the logic devices include optical calculation, optical interconnection, and spatial optical signal processing.
空间波导 弱耦合模理论 光逻辑器件 130.3120 Integrated optics devices 130.3750 Optical logic devices 230.7370 Waveguides Chinese Optics Letters
2008, 6(6): 408
