TY - JOUR JF - opsi JO - ICOP & ICPET _ INPC _ ICOFS VL - 21 IS - 0 PY - 2015 Y1 - 2015/3/01 TI - Stability of Dark Solitons In PT-symmetric Nonlinear Couplers TT - Stability of Dark Solitons In PT-symmetric Nonlinear Couplers N2 - In this paper we derive analytical dark soliton solutions in a nonlinear PT-symmetric coupler with gain in one waveguide and loss in the other in normal dispersion regime by using perturbation method. The usual solutions of noncoupled equations are dark solitons. Evaluating perturbation analytically shows that perturbations which guaranty the stability are in two forms of bright and dark solitons. However, in systems with the usual solutions of bright solitons, only a bright soliton perturbation satisfies the stability. SP - 1659 EP - 1662 AU - safaei, lida AU - hatami, mohsen AU - borhani zarandi, mahmood AD - KW - Nonlinear Optics KW - Dark Solitons KW - PT-Symmetric Couplers UR - http://opsi.ir/article-1-804-fa.html ER -