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Narrow Linewidth Distributed Bragg Reflectors Based on InGaN/GaN Laser.

Wuze Xie1,2, Junze Li3,4, Mingle Liao1,2

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Micromachines
|August 14, 2019
PubMed
Summary
This summary is machine-generated.

Distributed Bragg Reflector (DBR) lasers offer narrow linewidths for visible light communication. Optimized InGaN/GaN DBR lasers achieved a 0.45 nm linewidth, a 65% reduction compared to Fabry-Pérot lasers.

Keywords:
GaN-based lasersdistributed Bragg reflectorsgratingslinewidth

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Area of Science:

  • Optoelectronics
  • Semiconductor Lasers
  • Photonics

Background:

  • Emerging technologies like visible light communication demand narrow linewidth, easily integrated light sources.
  • Distributed Bragg Reflector (DBR) lasers are promising for monolithic integration and narrow spectral output.

Purpose of the Study:

  • To design and optimize an Indium Gallium Nitride/Gallium Nitride (InGaN/GaN)-based surface etched DBR for narrow-band reflection.
  • To fabricate and characterize DBR lasers to assess their linewidth performance for visible light communication applications.

Main Methods:

  • Utilized the finite-difference-time-domain (FDTD) method for DBR design and optimization.
  • Fabricated InGaN/GaN DBR lasers with varying grating orders (19th, 13th, 3rd) and duty ratios (50%, 75%, 95%).
  • Compared the performance of fabricated DBR lasers with conventional Fabry-Pérot (F-P) lasers on the same epitaxial wafer.

Main Results:

  • DBR reflectivity is dependent on grating period and duty ratio.
  • The minimum linewidth achieved was 0.45 nm using a 19th order grating with a 75% duty ratio.
  • DBR lasers exhibited a 65% reduction in Full Width at Half Maximum (FWHM) compared to F-P lasers.

Conclusions:

  • Optimized InGaN/GaN DBRs function as effective narrow-band wavelength filters.
  • DBR lasers demonstrate significantly improved linewidth performance over conventional F-P lasers.
  • These narrow linewidth DBR lasers are suitable for visible light communication systems.