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Fiber Grating Using Finite Difference Method 
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Oct1008, 09:36 PM

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Fiber Grating Using Finite Difference Method
I have to solve the Fiber grating coupledequations using FDM. These equations are coupled each other and strange inital conditions. That means ode45 from the matlab library function doesnt work here! I am totally fresh in numerical analysis and read some books, but unlukcy, i still confuse how to do this code:( Anyone has the program that solve this problem, pls share with me! Thank you %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% The probelm is: Parameters described: AF(z,t) is the amplitude of forwardpropagationwaves; AB(z,t) corresponds to the backwardpropagationwaves; z and t are space and time coordinates; AFz = dAF/dz AFt = dAF/dt; ABz = dAF/dz ABt = dAF/dt; i=sqrt(1); vg, delta, kapa, gama are constant terms. The coupledequations is: i*AFz + i*AFt/vg + delta*AF + kapa*AB + gama*(AF^2+2*AB^2)*AF = 0 i*ABz + i*ABt/vg + delta*AB + kapa*AF + gama*(AB^2+2*AF^2)*AB = 0 and the inital conditons: AF(0,t)=A(t); AF(z,0)=0; AB(L,t)=0; AB(z,0)=0 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 


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