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In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
Published on: May 27, 2013
Sampled Bragg gratings in chalcogenide (As(2)S(3)) rib-waveguides.
Optics Express
|June 17, 2009
Summary
Researchers created a strong sampled Bragg grating in a chalcogenide waveguide using a scanning Sagnac interferometer. This advancement offers performance comparable to silica fiber gratings for optical applications.
Area of Science:
- Materials Science
- Optical Engineering
- Photonics
Background:
- Chalcogenide glasses, specifically As(2)S(3), are highly photosensitive materials.
- Waveguide fabrication is crucial for integrated photonic devices.
- Sampled Bragg gratings offer unique spectral properties for optical filtering.
Purpose of the Study:
- To fabricate a sampled Bragg grating in a chalcogenide rib-waveguide.
- To characterize the spectral properties and induced refractive index change.
- To compare the performance with existing technologies in silica optical fiber.
Main Methods:
- Writing a sampled Bragg grating using a scanning Sagnac interferometer.
- Utilizing a highly photosensitive As(2)S(3) rib-waveguide.
- Employing numerical solutions of coupled mode equations to estimate refractive index change.
Main Results:
- Achieved a sampled Bragg grating with evenly spaced rejection peaks over a 40 nm bandwidth.
- Estimated an induced refractive index change exceeding 0.03.
- Demonstrated grating strength and bandwidth comparable to state-of-the-art silica fiber gratings.
Conclusions:
- Successfully demonstrated the fabrication of a strong sampled Bragg grating in As(2)S(3) waveguides.
- The results indicate significant potential for chalcogenide-based photonic devices.
- This work advances the capabilities of sampled Bragg gratings for optical signal processing.
