Data Link with a High-Power Pulsed Quantum Cascade Laser Operating at the Wavelength of 4.5 µm

Area of Science:

• Optoelectronics
• Optical Wireless Communications
• Infrared Technology

Background:

• Optical Wireless Communications (OWC) systems face limitations in link range and data rates.
• Existing continuous wave (cw) lasers offer low power, while pulsed lasers have limited bandwidth.
• Quantum Cascade (QC) lasers present a promising alternative for high-power OWC applications.

Purpose of the Study:

• To experimentally evaluate the performance of high-power pulsed QC lasers and photodetectors in OWC systems.
• To determine the achievable data link range using state-of-the-art QC laser technology.
• To investigate the impact of medium-infrared wavelengths on OWC performance.

Main Methods:

• Utilizing a high-power pulsed QC laser operating at ~4.5 µm with approximately 2 W output power.
• Employing advanced photodetectors optimized for medium-infrared detection.
• Analyzing signal-to-noise ratio (SNR) influenced by atmospheric attenuation and system parameters.

Main Results:

• Demonstrated the potential of high-power pulsed QC lasers for extending OWC link range.
• Identified medium-infrared operation as beneficial for reducing atmospheric losses (absorption, scattering, scintillation).
• Discussed the data link range achievable with the tested QC laser system.

Conclusions:

• High-power pulsed QC lasers are a viable technology for enhancing OWC systems.
• Medium-infrared OWC offers improved performance by mitigating atmospheric effects.
• Further research can optimize QC laser parameters for future high-speed, long-range OWC.