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Narrow-bandwidth Bragg grating filter based on Ge-Sb-Se chalcogenide glasses
Optics Express
|April 27, 2022
Summary
Chalcogenide-based Bragg grating filters offer superior narrow-bandwidth performance for integrated photonics. These filters overcome silicon limitations, demonstrating excellent filtering capabilities for optical sensing and signal processing applications.
Area of Science:
- Integrated photonics
- Optical filter technology
- Materials science
Background:
- Bragg grating (BG) filters are crucial for integrated photonics, enabling signal processing and optical sensing.
- Silicon-based photonic platforms face fabrication challenges that limit the application of narrow-bandwidth (Δλ) filters.
Purpose of the Study:
- To investigate narrow-bandwidth Bragg grating (BG) filters utilizing Ge-Sb-Se chalcogenide materials.
- To address fabrication limitations encountered in silicon-based photonic platforms.
Main Methods:
- Optimized the design parameters of the Bragg grating filter, including grating period, corrugation height, and grating number.
- Fabricated and characterized both symmetric and asymmetric corrugation chalcogenide BG filters.
Main Results:
- Achieved a narrow half-maximum bandwidth of 0.97 nm for symmetric filters.
- Demonstrated an even narrower half-maximum bandwidth of 0.32 nm for asymmetric filters.
- Highlighted the manufacturing convenience offered by the large corrugation of chalcogenide BG.
Conclusions:
- Chalcogenide-based Bragg grating filters exhibit excellent narrow-bandwidth filtering performance.
- These filters present a viable alternative to silicon-based filters, overcoming fabrication constraints.
- The developed filters show significant potential for advanced integrated photonic applications.
