The analysis of all-optical logic gates based with tunablefemtosecond soliton self-frequency shift..pdf

The analysis of all-optical logic gates based with tunable femtosecond soliton self-frequency shift Ming Xu,* Yan Li, Tiansheng Zhang, Jun Luo, Jianhua Ji, and Shuwen Yang The Center of Advanced Technology, School of Information Engineering, Shenzhen University, Shenzhen 518060, China ? xum@szu.edu.cn Abstract: A type of tunable femtosecond soliton logic gate based on fiber Raman Self-Frequency Shift (SFS) is studied in this paper.The Raman SFSs of femtosecond solitons governed by the Newton’s cradle mechanism in logic gate are analyzed with an Improved Split-Step Fast Fourier Transform (ISSFFT) algorithm. The impact factors of the solitonic pulse frequency shift and temporal time shift, which are included the Third-Order Dispersion (TOD) effect, are investigated. The existing theoretical equation of SFS is modified into a new expression for this type of soliton logic gate. A lower switching power and the small size of the soliton logic gate device is designed to realize the logic functions of AND, NOT, and XOR. The results demonstrate that the logic gate based on SFS is belonged to the asynchronous system and can be achieved with Milli-Watt switching power and good extinction ratio. ISSFFT is effective and accurately to analyze higher-order dispersive and nonlinear effects in the logic gates. ? 2014 Optical Society of America OCIS codes: (200.4660) Optical logic; (190.5530) Pulse propagation and temporal solitons; (190.5650) Raman effect; (320.7140) Ultrafast processes in fibers. References and links 1. J. H. Kim, Y. M. Jhon, Y. T. Byun, S. Lee, D. H. Woo, and S. H. Kim, “All-optical xor gate using semiconductor optical amplifiers without additional input beam,” IEEE Photon. Technol. Lett. 14, 1436–1438 (2002). 2. K. Chan, C.-K. Chan, L. K. Chen, and F. Tong, “Demonstration of 20-gb/s all-optical xor gate by four-wave mixing in semiconductor optical amplifier with rz-dpsk modulated inputs,” IEEE Photon. Technol. Lett. 16, 897– 899 (2004). 3. J. M. Dailey, S. K. Ibr