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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
Long period grating assistant photonic crystal fiber modal interferometer
Zhoulu Sun1, Yan-ge Liu, Zhi Wang
1Key Laboratory of Opto-Electronic Information and Technology, Ministry of Education and Institute of Modern Optics, Nankai University, Tianjin, China.
Optics Express
|July 13, 2011
Summary
A novel in-fiber modal interferometer was developed using a long period grating (LPG) in a two-mode all-solid photonic bandgap fiber (AS-PBGF). This compact device offers high interference contrast and controlled wavelength spacing for optical sensing applications.
Area of Science:
- Optoelectronics
- Fiber Optics
Background:
- Long Period Gratings (LPGs) are key components in fiber optic sensing.
- All-Solid Photonic Bandgap Fibers (AS-PBGFs) offer unique light guiding properties.
- Modal interferometers are sensitive to external perturbations.
Purpose of the Study:
- To present a novel in-fiber modal interferometer.
- To utilize an LPG inscribed in an AS-PBGF for mode coupling.
- To achieve a compact and high-contrast interferometer design.
Main Methods:
- Inscribing an LPG in a section of AS-PBGF.
- Splicing the AS-PBGF section between two standard single-mode fibers (SMFs) with a slight core offset.
- Exciting and coupling the LP01 and LP11 core modes within the AS-PBGF using the LPG.
Main Results:
- A high-contrast in-fiber modal interferometer was successfully fabricated.
- The LPG enabled efficient coupling between the LP01 and LP11 core modes.
- The wavelength spacing was controllable by adjusting the LPG position.
Conclusions:
- The proposed AS-PBGF-based LPG modal interferometer is compact and offers high interference contrast.
- The device allows for wavelength spacing control without altering the fiber length.
- This technology holds promise for advanced optical sensing and measurement systems.
