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[help] nonlinear FDTD

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tmalc

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fdtd, nonlinear

can anyone talk about fdtd for nonlinear simulation?
most of the topic is about linear domain, how about nonlinear case.
how to embed the nonlinear in UPML FDTD code?
 

nonlinear fdtd

any ideas

i hope seen the difference also
 
fdtd code with kerr effect

You should use the CPML from Gedney, since this kind of Perfectly matched layer is independent of the material properties at the interface.
 
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    kh3694

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fdtd nonlinear 2008

that is nice of you.
btw, should the nonlinear code also run in the region of PML?

Added after 19 minutes:

in nonlinear medium, how to calculate the time-averaged Poynting vector?
as the power related to local index of refraction.
 

fdtd nonlinear optics

Winn said:
You should use the CPML from Gedney, since this kind of Perfectly matched layer is independent of the material properties at the interface.
Click to expand...

I think PML and UPML can handle inhomogeneous medium as well, by normalizing epsilon by the relative permittivity [ 2nd-FDTD book Toflove, page304, eq.7.52]
 

cpml absorption

It really depends how you are modelling the nonlinear behaviour.
I have not heard about any algorithms which allows to put
non-linear materials into the boundary.

Basically, since modelling non-linearity is much harder than linear
materials youwould have to know exactly which model you will be using.
 
kerr+fdtd

i have been made my program to simulate optical fiber in linear and nonlinear case by BOR-FDTD and i used it to simulat Fiber Bragg Grating FBG and the results
in my papers in this link




thanks
 
fdtd + nonlinear medium

tmalc said:
Winn said:
You should use the CPML from Gedney, since this kind of Perfectly matched layer is independent of the material properties at the interface.
Click to expand...
I think PML and UPML can handle inhomogeneous medium as well, by normalizing epsilon by the relative permittivity [ 2nd-FDTD book Toflove, page304, eq.7.52]
Click to expand...

PML is just the topic keyword for nearly perfect absorption. UPML is a specific technic to get a nearly perfect absorption. Achieving nearly perfect absorption for inhomoheneous media is not difficult to handle for every implemented absorption method (Split-Field PML, Uniaxial PML, Convolutional PML), but as far as you go into dispersive materials you should avoid Split-Field PML and Uniaxial PML, because you have to derive and implement for every dispersive media a special suited algorithm for that media. Choosing the Convolutional PML (3rd Editition Taflove) from Gedney, you got one algorithm for every dispersive media.
 

fdtd for fiber bragg grating simulation

fatma1000 said:
i have been made my program to simulate optical fiber in linear and nonlinear case by BOR-FDTD and i used it to simulat Fiber Bragg Grating FBG and the results
in my papers in this link




thanks
Click to expand...

thank you for your information. but how to decide the weight coefficient between Raman scatter effet and Kerr effect.

Added after 1 minutes:

Winn said:
tmalc said:
Winn said:
You should use the CPML from Gedney, since this kind of Perfectly matched layer is independent of the material properties at the interface.
Click to expand...
I think PML and UPML can handle inhomogeneous medium as well, by normalizing epsilon by the relative permittivity [ 2nd-FDTD book Toflove, page304, eq.7.52]
Click to expand...

PML is just the topic keyword for nearly perfect absorption. UPML is a specific technic to get a nearly perfect absorption. Achieving nearly perfect absorption for inhomoheneous media is not difficult to handle for every implemented absorption method (Split-Field PML, Uniaxial PML, Convolutional PML), but as far as you go into dispersive materials you should avoid Split-Field PML and Uniaxial PML, because you have to derive and implement for every dispersive media a special suited algorithm for that media. Choosing the Convolutional PML (3rd Editition Taflove) from Gedney, you got one algorithm for every dispersive media.
Click to expand...


Thank you for your suggestion

Added after 1 hours 59 minutes:

does anyone have 3rd Edition Taflove?
 

cpml+kerr+fdtd

does anyone have Taflove journal....plese send me..
 

hi,

the weight coefficient between Raman scatter effect and Kerr effect in most cases for optical fiber is equal 0.7

thanks
 

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