18 October 2017 Analysis of InP-based QCLs designed for application in optical transmitter of free-space optics
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Abstract
In this paper, the study of AlInAs/InGaAs/InP Quantum Cascade Lasers application in Free Space Optical data link is performed. Implementation of such FSO link operated in long-wavelength infrared (LWIR: 8-12 μm) will be unique for construction of so-called RF/FSO hybrid communication system. The range of longer wavelengths provides better data transfer performance in the case of severe weather conditions, especially, fog, low haze or air turbulence. In the frame of this work, series of QCLs for application in FSO system were examined. They are characterized by different geometries and constructions towards best performance in optical link systems operated in the wavelength range of 8-12 μm. The preliminary test of QCLs included electrical measurements of pulsed light-current-voltage characteristics and time-resolved spectra. The obtained results made it possible to determine operation point for FSO. Their modulation performances were tested using the laboratory laser drivers. Based on measurements, both power and time parameters of QCLs pulses were investigated. These results defined critical values for FSO system. The second part of the analysis concerned the spatial parameters of QCLs radiation. Knowledge of spatial characteristics of emission is vital for FSO optics construction. To characterize spatial properties of beams, far-field patterns of emission were registered. Finally, the obtained results made it possible to optimize the optical transmitter construction and further performance of FSO laboratory model. This research was supported by The Polish National Centre for Research and Development grant DOB-BIO8/01/01/2016.
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Kamil Pierscinski, Janusz Mikołajczyk, Dariusz Szabra, Dorota Pierścińska, Piotr Gutowski, Zbigniew Bielecki, Maciej Bugajski, "Analysis of InP-based QCLs designed for application in optical transmitter of free-space optics", Proc. SPIE 10437, Advanced Free-Space Optical Communication Techniques and Applications III, 104370A (18 October 2017); doi: 10.1117/12.2278603; https://doi.org/10.1117/12.2278603
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