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In-line interferometer based on intermodal coupling of a multicore fiber
Optics Express
|July 21, 2015
Summary
This study demonstrates an in-line interferometer using multicore fiber (MCF). Decreasing the fiber
Area of Science:
- Optics and Photonics
- Fiber Optics
- Interferometry
Background:
- Multicore fibers (MCFs) offer unique light propagation properties.
- Intermodal coupling in MCFs can be exploited for sensing and optical signal processing.
Purpose of the Study:
- To propose and experimentally demonstrate an in-line interferometer based on intermodal coupling in an MCF.
- To investigate the effect of MCF waist diameter on intermodal coupling and interferometer performance.
Main Methods:
- Fabrication of an in-line interferometer by adiabatically tapering an MCF.
- Theoretical and experimental analysis of intermodal coupling as a function of MCF waist diameter.
- Measurement of transmission oscillations, extinction ratio, and oscillation periodicity.
Main Results:
- Intermodal coupling is strongly influenced by the MCF waist diameter, affecting evanescent field and pitch size.
- Transmission oscillations from intermodal coupling and interference intensify as waist diameter decreases.
- Waist diameter variations alter the extinction ratio and oscillation periodicity of transmission signals.
Conclusions:
- The proposed MCF-based in-line interferometer is sensitive to fabrication parameters, specifically waist diameter.
- Waist diameter control is crucial for tailoring the performance of MCF intermodal coupling interferometers.
- This device shows potential for applications requiring tunable optical interference.
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