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Polarization-mode coupling in birefringent fiber gratings
Kyung Shik Lee1, Joon Yong Cho
1School of Electrical and Computer Engineering, Sung Kyun Kwan University, Suwon, Korea. kslee@yurim.skku.ac.kr
Summary
This study analyzes polarization-mode coupling in birefringent fiber gratings, showing that specific grating parameters enable coupling between different linearly polarized (LP) core modes. Periodic fiber pressing was found to induce complete LP01x-to-LP01y and LP01x-to-LP11y mode coupling.
Area of Science:
- Optics and Photonics
- Fiber Optics
- Materials Science
Background:
- Birefringent fiber gratings are crucial optical components.
- Understanding polarization-mode coupling is essential for advanced fiber optic devices.
- Existing models may not fully capture complex coupling behaviors in gratings.
Purpose of the Study:
- To analyze polarization-mode coupling in birefringent fiber gratings.
- To derive general expressions for coupling coefficient components.
- To investigate the conditions for achieving specific LP mode couplings.
Main Methods:
- Theoretical analysis of polarization-mode coupling.
- Derivation of general coupling coefficient expressions.
- Experimental demonstration using periodically pressed birefringent gratings.
Main Results:
- Established that polarization-mode coupling between any two LP core modes is achievable by tuning grating parameters.
- Analytically determined that complete LP01x-to-LP01y and LP01x-to-LP11y mode coupling occurs under periodic fiber pressing.
- Experimentally demonstrated LP01x-to-LP11y mode coupling in gratings created by pressing a two-mode fiber.
Conclusions:
- The study provides a comprehensive analysis of polarization-mode coupling in birefringent fiber gratings.
- The findings confirm that precise control over grating parameters allows for targeted polarization mode manipulation.
- The coupled-mode analysis accurately predicts experimental observations, validating the theoretical framework.