How does the reflection spectrum change as the grating length increases?
As the grating length of a Fiber Bragg Grating (FBG) increases, the reflection spectrum generally exhibits the following changes:
- Narrower 3dB Bandwidth: A longer grating interacts with the light over a more extended region, allowing for a more selective reflection of wavelengths. This increased selectivity results in a narrower 3dB bandwidth in the reflection spectrum.
- Higher Reflectivity: With more grating periods interacting with the propagating light, a longer FBG typically achieves a higher peak reflectivity at its Bragg wavelength.
Beijing Dacheng Yongsheng Technology Co., Ltd. (DCYS/OFSCN) offers various types of bare Fiber Bragg Gratings where the grating length can be customized to achieve specific spectral characteristics. For instance, our OFSCN® Polyacrylate Fiber Bragg Gratings / Fiber Bragg Grating Strings (bare) provide customizable grating lengths, typically 3mm, 5mm, or 10mm, with other lengths available upon discussion.
Here is a standard image of our bare FBGs:
You can find more detailed technical parameters on our website:
OFSCN® Polyacrylate Fiber Bragg Gratings / Fiber Bragg Grating Strings (bare)
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