MATLAB Center Wavelength of Fiber Bragg Grating Filter

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SUMMARY

The discussion focuses on determining the center wavelength of a Fiber Bragg Grating (FBG) notch filter using MATLAB. The user is struggling to achieve an accuracy within 0.01nm, primarily due to the limited dataset of approximately 10 discrete data points. Attempts to use a quadratic fit have proven inadequate, as the method's accuracy is heavily influenced by the surrounding data points. The correct center wavelength is identified as 1.5458 µm, highlighting the challenges of analyzing small datasets in wavelength determination.

PREREQUISITES
  • Understanding of Fiber Bragg Grating (FBG) technology
  • Proficiency in MATLAB for data analysis
  • Knowledge of quadratic fitting techniques
  • Familiarity with wavelength measurement in optical filters
NEXT STEPS
  • Research advanced data fitting techniques in MATLAB
  • Explore interpolation methods for small datasets
  • Learn about signal processing techniques for optical measurements
  • Investigate the use of more comprehensive datasets for FBG analysis
USEFUL FOR

Optical engineers, MATLAB users, and researchers working with Fiber Bragg Grating filters who need to accurately determine center wavelengths in their experiments.

spyrius
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I would like to locate the center wavelength of a FBG notch filter in MATLAB, but I'm having trouble getting an answer within 0.01nm of the correct wavelength.

upload_2016-2-16_20-55-55.png
So far I've tried using a quadratic fit with MATLAB, but that is too dependent on the amount of data points to the left and right of the notch. The location of the peak is also not correct, because the filter is only made up of ~10 discrete data points, and the highest/lowest one is not necessarily the center.

Any help would be appreciated.
 
Can you fill us in a bit more on what you're trying to do? Are the 10 points you mentioned points taken from the graph you showed? If so, it's entirely possible that with such a small data set, you could completely miss the valley (it's not a peak) at 1.5458 ##\mu##m.
 

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