<i>λ</i> ∼ 4.7 μm Quantum Cascade Distributed-Feedback Lasers for Free-Space Communications

<i>λ</i> ∼ 4.7 μm Quantum Cascade Distributed-Feedback Lasers for Free-Space Communications

Quantum cascade lasers (QCLs) have emerged as promising candidate sources for free-space communications. High optical power densities, short photon lifetimes, and low internal capacitance are important factors influencing the transmission bandwidth. We report the design and fabrication of 4.7 <in...

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Bibliographic Details
Main Authors: Morgan Turville-Heitz, Robert Marsland, Jae Ha Ryu, Steven A. Jacobs, Jeremy D. Kirch, Tom Earles, Steven Ruder, Kevin Oresick, Benjamin Knipfer, Dan Botez, Luke J. Mawst
Format: Article
Language:English
Published: MDPI AG 2025-01-01
Series:Photonics
Subjects:
quantum cascade lasers
distributed feedback lasers
optical communication
mid-infrared lasers
high-speed modulation
Online Access:https://www.mdpi.com/2304-6732/12/1/51
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Summary:Quantum cascade lasers (QCLs) have emerged as promising candidate sources for free-space communications. High optical power densities, short photon lifetimes, and low internal capacitance are important factors influencing the transmission bandwidth. We report the design and fabrication of 4.7 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">μ</mi></semantics></math></inline-formula>m emitting, 1.5 mm cavity length, single-mode distributed-feedback QCLs, with a CW front-facet output power of 165 mW and a calculated photon lifetime of 11.6 ps, resulting in an electrically limited CW modulation with a 3 dB cutoff at 850 MHz.
ISSN:2304-6732

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