Analysis of Raman QWS-DFB Fiber Laser Considering Nonlinear SPM and XPM Effects

Document Type : Original Article

Abstract

In  this  paper,  a /2-phase  shifted  distributed  feedback  Raman  fiber  (DFB-RF)  laser  above  threshold  condition  is
analyzed  theoretically.  The  cross  phase  modulation  (XPM)  and  self  phase  modulation  (SPM)  nonlinear  effects  are
considered in the presented model. Numerical results show that the XPM and SPM increase the output power of DFB-
Raman fiber laser. Variation of wavelength of structure for  different values of pump power has been evaluated in  the
presence  and  absence  of  nonlinear  effects. It  is  found  that  in  the  absence  of  nonlinear  effects  wavelength  of  laser  is
constant.  However,  in  the  presence  of  nonlinear  effects  a  red  shift  about  5×10-2nm  with  increasing  pump  power  is
observed.  Simulation  is  performed  by  using  transfer  matrix  method  to  solve  three  coupled  nonlinear  wave  equations
which  describe  the  propagation  of  pump,  forward  and  backward  Stokes  waves.  The  transfer  matrix  used  for  DFB
Raman fiber laser, is introduced for the first time in this paper.  
 

Keywords


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