Fiber Bragg Grating

  • Thread starter Gilbert
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Main Question or Discussion Point

Hi everyone!

I use a FBG in a double-clad multimode optical fiber of 20 µm core diameter, and a laser diode working at 910 nm as ligth source.

As the Bragg reflection wavelength of a FBG depends on the effective refractive index of the different guided modes (λFBG=2.neff.Λ , where Λ is the period), is it right to say that the FBG will reflect each of these modes? Or is a FBG only used to carry out reflection of a fixed wavelength, independantly of the modes?

Because in my case, the FBG has been designed to have a maximized reflection (99%) at 910 nm, which is the LP01 wavelength. But there are 3 other guided modes : LP11, LP02 and LP21.

Thanks in advance.

Gilbert.
 

Answers and Replies

  • #2
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Edit : is there any book or website that could explain the behavior of FBG with multimode fiber ?
 

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