Journal
ADVANCED PHOTONICS
Volume 4, Issue 5, Pages -Publisher
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
DOI: 10.1117/1.AP.4.5.056004
Keywords
free-space communication; Stark-effect external modulator; midinfrared photonics; intersubband technology; unipolar quantum devices
Categories
Funding
- Direction Generale de l'Armement (DGA)
- ANR [ANR-18CE09-0035, 828893, 820419]
- CNRS Renatech network
- ENS-Thales Chair
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Free-space optical communication is a promising alternative to fiber communication systems. This study demonstrates the possibility of building a long-range link using unipolar quantum optoelectronics, achieving a record bitrate.
Free-space optical communication is a very promising alternative to fiber communication systems, in terms of ease of deployment and costs. Midinfrared light has several features of utter relevance for free-space applications: low absorption when propagating in the atmosphere even under adverse conditions, robustness of the wavefront during long-distance propagation, and absence of regulations and restrictions for this range of wavelengths. A proof-of-concept of high-speed transmission taking advantage of intersubband devices has recently been demonstrated, but this effort was limited by the short-distance optical path (up to 1 m). In this work, we study the possibility of building a long-range link using unipolar quantum optoelectronics. Two different detectors are used: an uncooled quantum cascade detector and a nitrogen-cooled quantum well-infrared photodetector. We evaluate the maximum data rate of our link in a back-to-back configuration before adding a Herriott cell to increase the length of the light path up to 31 m. By using pulse shaping, pre- and post-processing, we reach a record bitrate of 30 Gbits(-1) for both two-level (OOK) and four-level (PAM-4) modulation schemes for a 31-m propagation link and a bit error rate compatible with error-correction codes.
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