Trends in Applied Sciences Research1819-35792151-7908Academic Journals Inc.10.3923/tasr.2011.1335.1344JabbariMasoudSolookinejadGhahraman122011612Lasers play an important role in all optical communication systems. One of the influential laser sources is Distributed Feedback (DFB) laser. In this study, based on the coupled wave and carrier rate equations a spatial chirped grating distributed feedback laser has been simulated and investigated. Also, the effects of some parameters including spatial chirped grating, kappa L and phase shift on the large signal output power responses has been investigated. The results showed to had a single mode, high Side Mode Suppression Ratio (SMSR) and high optical output power. The parameters such as chirp coefficient and injection current have been adjusted about 1.5x10^{¯3} and 200 mA, respectively. By adjusting the chirped coefficient and injection current and using the λ/4 phase shift in the middle of the DFB laser, the output optical power was single mode. Also, side mode suppression ratio and optical output power were more than 50 dB and 60 mW, respectively. Therefore by optimizing the parameters such as injection current, amount of spatial chirped grating and phase shift, a DFB laser with high output power and high SMSR have been achieved. The simulation was based on the Finite Difference Time Domain (FDTD) numerical method.]]>Agrawal, G.P.,2002Temmar, A. and A. Belghoraf,2006Asadpour, A. and H. Golnabi,2008Touati, F., S. Douss, N. Elfadil, Z. Nadir, M.B. Suwailam and M. Loulou,2007Chu, H., Z. Xie, X. Xu, L. Zhou and Q. Liu,2011Abu-Elsaoud, A.M., S.T. Tuleukhanov and D.Z. Abdel-Kader,2008Triticum aestivum) germination.]]>Liang, Z., X. Ma, F. Fang and S. Zhu,2010Shahshahani, F. and V. Ahmadi,2008Bazhdanzadeh, N., V. Ahmadi, H. Ghafoorifard and F. Shahshahani,2008Morgado, J.A.P., C.A.F. Fernandes and J.B.M. Boavida,2010Signoret, P., M. Myara, J.P. Tourrenc, B. Orsal and M.H. Monier et al.,2004Jia, X.H., D.Z. Zhong, F. Wang and H.T. Chen,2007Hillmer, H., C. Prott, F. Romer and S. Hansmann,2004Djavid, M., A. Ghaffari, F. Monifi and M. S. Abrishamian,2008Dekkiche, L. and R. Naoum,2007Park, J., X. Li and W.P. Huang,2003Jabbari, M., M.K. Moravvej-Farshi, R. Ghayour and A. Zarifkar,2009Carroll, J., J. Whiteaway and D. Plumb,1998Dekkiche, L. and R. Naoum,2008