Abstracts
STREAM 4: Free Space Optics Tuesday 16:00 -17:30
Satellite-based Quantum Communications
Jasminder Sidhu, The University of Strathclyde
Session Chair: Donald Govan, Photonics Coherent Architect, Mbryonics
Space provides long lines of sight and low losses of free-space optical transmission. For quantum technologies, these properties provide an ideal platform to expand the range of quantum networks and distributed quantum technologies.
Space quantum technologies is therefore a topic of increasing importance to develop long-range secure communications, enhanced sensing and imaging, and networked quantum computing. However, using satellites for networked quantum information protocols is beset with challenges. Namely, the quantum channel between a satellite and an optical ground station can only be established and maintained for a limited time window and has a highly dynamic loss due to atmospheric turbulence and attenuation. In this talk, I will provide an overview of recent advances that address these challenges for satellite- based quantum key distribution and model real-world engineering constraints for upcoming satellite missions. I will also summarise recent proposals for how satellite-based networks can support near-term distributed quantum technologies. Mode-division multiplexing free-space optical communications: capacity and turbulence resiliency Yiming Li, Aston Univiersity Free-space optical communications can provide have been considered in FSO systems, including polarisation multiplexing, dense wavelength-division multiplexing (DWDM), and mode-division multiplexing (MDM). In MDM systems, adaptive optics (AO) has been the major approach to combat turbulence. However, a single AO can not fully compensate for strong turbulence, where both phase and amplitude distortion exist, and a considerable amount of power may fall outside the receive aperture. Therefore, previous MDM transmissions mainly focused on weak turbulence, and severe performance degradation has been observed in strong turbulence. In this talk, we demonstrated a digital signal processing (DSP)-based approach to simultaneously increase transmit data rate and enhance turbulence resiliency in strong turbulent channels. ultra-fast data rate, ultra-long link distance, robustness to electromagnetic interference, and is a promising technology for high-speed wireless transmissions. To further increase the link capacity, different multiplexing technologies
MWIR and LWIR FSO Communications with Unipolar Quantum Optoelectronics
Xiaodan Pang, Zhejiang University, Hangzhou, China and Riga Technical University, Riga, Latvia
Free-space optical (FSO) communication is expected to play a key role in future ICT infrastructure, particularly in non-terrestrial networks. A crucial factor in selecting technological
solutions is the ability to achieve high-speed, robust transmission over long distances through atmospheric channels, which depends on wavelength choice. The mid-wave IR (MWIR, 3-5 µm) and long-wave IR (LWIR, 8-12 µm) within the mid-IR regime are promising options [1]. Semiconductor sources, modulators, and detectors enabling high- bandwidth and efficient signal transmission are also critical. Unipolar quantum optoelectronics (UQOs), such as quantum cascade lasers (QCLs), modulators, and detectors, have shown potential for building FSO systems [2]. This talk presents our experimental results with UQOs and discusses the challenges of advancing these technologies [3-9]. We also review recent global R&D efforts in this promising area. Acknowledgement This work was supported in part by the LZP FLPP project ‘MIR-FAST’ lzp 2023-1-0503, and in part by the strategic innovation program Smarter Electronic Systems a joint venture by Vinnova, Formas and the Swedish Energy Agency A FRONTAHUL project (2023-00659) References [1] A. Delga et al., “Free-space optical communications with quantum cascade lasers,” in Quantum Sensing and Nano Electronics and Photonics XVI, 2019, vol. 10926, p. 1092617. [2] H. Dely et al., “10 Gbit s−1 Free Space Data Transmission at 9 µm Wavelength With Unipolar Quantum Optoelectronics,” Laser Photonics Rev., vol. 16, no. 2, 2021. [3] X. Pang et al., “Free-Space Communications Enabled by Quantum Cascade Lasers,” pssa, vol. 218, no. 3, p. 2000407, 2021. [4] X. Pang et al., “Direct Modulation and Free-Space Transmissions of up to 6 Gbps Multilevel Signals With a 4.65-µm Quantum Cascade Laser at Room Temperature,” J. Lightw. Technol., vol. 40, no. 8, pp. 2370-2377, 2022. [5] X. Pang et al., “11 Gb/s LWIR FSO Transmission at 9.6 µm using a Directly-Modulated Quantum Cascade Laser and an Uncooled Quantum Cascade Detector,” OFC 2022, p. Th4B.5. [6] M. Joharifar et al., “8.1 Gbps PAM8 Long-Wave IR FSO Transmission using a 9.15-µm Directly-Modulated QCL with an MCT Detector,” OFC 2023, p. Th1H.1. [7] M. Han et al., “Long-Wave Infrared Discrete Multitone Free-Space Transmission Using a 9.15-μm Quantum Cascade Laser,” IEEE Photonics Technology Letters, vol. 35, no. 9, pp. 489-492, 2023. [8] M. Joharifar et al., “16.9 Gb/s Single-Channel LWIR FSO Data Transmission with Directly Modulated QCL and MCT Detector,” OFC 2024, p. Th2A.25. [9] X. Pang et al., “Free Space Communication Enabled by Directly Modulated Quantum Cascade Laser,” OFC 2024, p. Th3C.1.
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