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Radiation-mode coupling loss in tilted fiber phase gratings
Optics Letters
|October 29, 2009
Summary
Grating tilt offers a new way to adjust fiber phase grating spectral shapes for filter applications. This study confirms theoretical predictions match experimental results for tunable grating filters.
Area of Science:
- Optics and Photonics
- Materials Science
- Fiber Optics
Background:
- Fiber phase gratings are crucial for optical filtering applications.
- Controlling spectral shapes is key for demanding filter designs.
- Guided-mode to radiation-mode coupling loss is a primary mechanism.
Purpose of the Study:
- To investigate grating tilt as an adjustable parameter for tuning fiber phase grating spectral shapes.
- To compare theoretical predictions with experimental measurements of grating spectra.
- To validate the use of grating tilt in designing advanced fiber gratings.
Main Methods:
- Utilized coupled-mode-theory analysis for calculating transmission spectra.
- Fabricated strong fiber gratings via ultraviolet irradiation of deuterium-sensitized fiber.
- Experimentally measured spectra for gratings with tilt angles from 0 to 15 degrees.
Main Results:
- Demonstrated that grating tilt significantly influences spectral shapes.
- Showed good agreement between calculated and measured transmission spectra.
- Validated the effectiveness of grating tilt alongside grating length and index change.
Conclusions:
- Grating tilt is a vital, tunable parameter for designing fiber phase gratings.
- The coupled-mode-theory accurately predicts spectral behavior with grating tilt.
- This provides enhanced control for sophisticated optical filter applications.
