Help with FBG(Fibre Bragg Grating) sensors?

I'm working on a FBG pressure sensor design and was wondering if the Bragg wavelength of Fibre Bragg Gratings keep increasing indefinitely as the strain on it keeps increasing? (Obviously till it doesn't break), or is there a range only through which the Bragg wavelength can increase and after that just stops increasing although the strain on it keeps increasing.


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