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Compact terahertz birefringent gratings for dispersion compensation
Optics Express
|March 18, 2022
Summary
We developed a compact terahertz dispersion compensator using subwavelength gratings. This device significantly boosts negative group velocity dispersion, overcoming a key challenge for next-generation wireless communication systems.
Area of Science:
- Optics and Photonics
- Materials Science
- Wireless Communications
Background:
- Terahertz (THz) radiation offers vast bandwidth for next-generation wireless systems.
- Signal dispersion is a major limitation for achieving high bit rates in THz communication.
Purpose of the Study:
- To experimentally demonstrate a novel compact terahertz dispersion compensator.
- To address the dispersion impairment in THz communication systems.
Main Methods:
- Fabrication of subwavelength gratings using low-loss cyclic olefin copolymer and micro-machining.
- Exploitation of strong index modulation and asymmetric cross-section for birefringence.
- Experimental characterization of group velocity dispersion at 0.15 THz.
Main Results:
- Achieved high negative group velocity dispersion of -188 (x-polarization) and -88 (y-polarization) ps/mm/THz.
- Demonstrated a 7.5-fold increase in negative dispersion compared to existing state-of-the-art.
- Realized high dispersion compensation in a compact 43 mm grating length.
Conclusions:
- Polymer-based birefringent gratings offer effective dispersion compensation for THz systems.
- The developed compensator can be integrated into both wireless and waveguide-based THz links.
- Enables higher bit rates and improved performance for future THz communication.
