In the absence of any physical change, will the wavelength drift over time?
The center wavelength of a Fiber Bragg Grating (FBG) is intrinsically stable in the absence of any physical changes. It is primarily determined by the grating period and the effective refractive index of the fiber core. If there are no external influences such as temperature variations, applied strain, or long-term material degradation, these fundamental parameters remain constant, and thus the FBG’s center wavelength will not drift over time.
For fundamental FBG components, you can refer to our OFSCN® Polyacrylate Fiber Bragg Gratings / Fiber Bragg Grating Strings (bare).
Here is a representative image of an FBG-based sensor:
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