Abstract
We demonstrate ultra-narrow linewidth fixed wavelength hybrid lasers composing a semiconductor gain chip and extended silicon nitride Bragg grating. Fabricated ultra-low κ Bragg gratings provide a narrow bandwidth and high side-lobe suppression ratio. A single-wavelength 1544nm hybrid extended-distributed Bragg reflector laser with 24mW output power and a Lorentzian linewidth of 320Hz is demonstrated, providing a high-performance light source for on- and off-chip applications.
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