Optimization of Single-mode Sapphire Waveguide Bragg Gratings
Journal of Lightwave Technology(2024)
摘要
We demonstrate the fabrication and optimization of waveguide Bragg gratings on single-crystal sapphire substrates using femtosecond laser direct writing. The gratings are fabricated using modulated bursts and are embedded inside single-mode depressed cladding waveguides. Through design optimization, and fabrication parameter tuning, a depressed cladding waveguide with a loss of ∼0.8 dB/cm and a Bragg grating with a reflectivity of higher than 90% in the telecommunications wavelength band are demonstrated. The waveguide Bragg grating exhibits stable thermal properties under annealing at 1200°C. A sampled grating and a grating array are also demonstrated, showing the potential for more complex grating designs.
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关键词
Bragg gratings,femtosecond laser,integrated optics,micromachining,optical waveguides
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