FBG parameter

[tee din chai]

Hi,

How can i know the refractive index of the grating?
and also the pitch, the width of each grating ?

thanks

[Lizzie Li]

You mean the fiber index or the effective index? You can set the fiber index in the Fiber Parameters, and after this, the effective index can be calculated in the Mode Parameters. Then you can define the grating pitch and some other parameters on the Grating Parameters.
Just do it step by step.

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[tee din chai]

Hi, Lizzie Li,

Thanks for your response.

I want to ask about the effective index.
The well-known FBG equation, => Lambda = 2 * pitch * Neff.
The Neff is the effective mode of the fiber or the effective index of the grating region?

[Lizzie Li]

It is the effective index of mode of the fiber.

[tee din chai]

Thanks.
So, i have to find the effective mode of the fiber without grating.

By the way, any effect of the grating width to FBG? (the size of each grating, not the pitch/lattice constant between the grating)

thank you

[NGUYEN KHAC BINH]

how to connect between Optical Grating and Optisystem.
I exported file (FBG.txt) from Optigrating, but I can not import it into optisystem, please help me, thanks so much !

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