How does the magnitude of the grating period determine the reflected wavelength?
The reflected wavelength of an FBG is determined by the Bragg condition, which is expressed by the formula:
λB = 2 * neff * Λ
Where:
- λB is the Bragg wavelength (the reflected wavelength).
- neff is the effective refractive index of the fiber core.
- Λ (Lambda) is the grating period (the distance between successive reflective planes within the FBG).
From this formula, it is clear that the reflected wavelength (λB) is directly proportional to the grating period (Λ). This means:
- A larger grating period will result in a longer reflected wavelength.
- A smaller grating period will result in a shorter reflected wavelength.
This fundamental relationship allows for the design and customization of Fiber Bragg Gratings to reflect specific wavelengths for various sensing applications.
OFSCN® offers a range of Fiber Bragg Gratings where parameters such as wavelength range (which is directly related to the grating period) can be customized to meet specific application requirements.
Here is an image of an OFSCN® Fiber Bragg Grating:
You can find more detailed technical parameters on our products here:
OFSCN® Polyacrylate Fiber Bragg Gratings / Fiber Bragg Grating Strings (bare)
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