具备检错和纠错性能的可重构可存储的混沌逻辑运算

Reconfigurable and Storable Chaotic Logic Operations with the Performance of Error Detection and Correction

基于混沌同步理论与电光调制理论,提出一种新颖的可重构可存储的混沌逻辑运算实现方案。通过探索驱动垂直腔表面发射激光器和响应垂直腔表面发射激光器输出偏振光的同步质量随外加电场与归一化注入电流的演变规律,将外加电场与归一化注入电流分别调制为控制逻辑信号和逻辑输入。通过转换逻辑控制信号与逻辑输入的运算关系,系统就能重构处理混沌逻辑运算。采用阈值机制获得四个相同的逻辑输出,实现了混沌逻辑运算的延时存储,且系统噪声强度在低于1.84×10^(9)情况下逻辑输出具备良好的检错和纠错性能。

In the digital chaotic secure communication network,the dynamic packet switching technology of digital chaotic signal plays an important role in improving the switching and transmission capacity of the optical chaotic network.In the optical chaotic packet switching node,the processing of optical chaotic signals involves multiplexing,demultiplexing,switching,regeneration,storage and so on.However,the premise of realizing the optical chaotic signal processing mentioned above is to have optical chaotic logic gates(such as logic NOT,AND,NAND,OR,NOR,XOR,XNOR)and digital chaotic bit computing devices(chaotic combinational logic operation devices and chaotic sequential logic operation devices)with low power,low loss and high speed.Therefore,in order to realize the digital chaotic signal dynamic packet switching technology,it is necessary to explore the low-loss and high-speed digital chaotic logic operation.Compared with traditional logic devices(such as digital circuit logic devices,optoelectronic logic devices,all-optical logic devices),chaotic logic operation devices have the characteristics of more security,more flexibility,lower power cost and so on.However,at present,most of the schemes implement the static chaotic logic operation,and the development of reconfigurable chaotic logic operation,chaotic combinational and sequential logic operation is still lagging behind.The external interference will not only affect the chaotic signal,but also may cause the system parameters to drift,change the output polarization state of the laser,resulting in the instability of the chaotic logic operation,and even errors.Therefore,it is of great value and significance to study the reconfigurable and storable chaotic logic operation with strong robustness and the ability of error detection and correction.In the implementation scheme of reconfigurable and storable chaotic logic operation,the normalized injection current of D-VCSEL is modulated as a logic input,and the applied electric field on PPLN1 is modulated as a logic control signal.The logic outputs Z1 and Z2 are demodulated by a threshold mechanism for synchronization errors between the polarizations(x-PCD1 and y-PCD1)from the D-VCSEL and those(x-PCR and y-PCR)from R-VCSEL.The logic outputs Z3 and Z4 are obtained by demodulating the x-PCD1 and the x-PCR,respectively,based on threshold mechanism.The system can reconstruct and store the chaotic logic operations by transforming the logic operation relationship between the logic control signal and the logic input.It is found that when the noise intensity is 1×109,the logic outputs Z1 and Z2 demodulated by the complete chaotic synchronization mechanism have more errors,but Z3 and Z4 have no errors.In order to improve the anti-noise performance of Z1 and Z2,the threshold mechanism is used to demodulate the synchronization error.When the noise intensity reaches 1.77×10^(9),the logic output will not generate bit errors.When the noise intensity reaches 1.84×10^(9),the logic outputs Z1 and Z2 generate bit errors,but the logic outputs Z3 and Z4 remain correct.If the noise intensity reaches 1.89×10^(9),the logic outputs Z1,Z2,Z3 and Z4 all have bit errors,and the logic operation fails.Therefore,the anti-noise performance of Z3 and Z4 is better than that of Z1 and Z2.And if the noise intensity is in the range of 1.84×10^(9),the logic outputs Z1 and Z2 can be checked with Z3 and Z4 to realize error detection and correction processing.