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    #11812
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    tee din chai
    Participant

    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

    #11773
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    tee din chai
    Participant

    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?