Marco A. Fernandes
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View article: System calibration for single-wavelength multi-terabit mode-division multiplexing free-space optical communication systems
System calibration for single-wavelength multi-terabit mode-division multiplexing free-space optical communication systems Open
In this paper, we propose a optical calibration strategy to support a single-wavelength mode-division multiplexing multiple-input multiple-output free-space optical communication system utilising 6 Hermite-Gaussian modes. To minimise the i…
View article: On the Coexistence of Quantum and Classical Signal Transmission Over Turbulent FSO Channels
On the Coexistence of Quantum and Classical Signal Transmission Over Turbulent FSO Channels Open
Secure data transmission is essential in today's world, and quantum key distribution (QKD) is widely recognized as the technology of choice to enable information-theoretical secure symmetric key generation. While optical fibers are typical…
View article: A Comprehensive Review of UAV-Assisted FSO Relay Systems
A Comprehensive Review of UAV-Assisted FSO Relay Systems Open
The evolving requirements of next-generation mobile communications networks can be met by leveraging vertically deployed Unmanned Aerial Vehicle (UAV) platforms integrated with Free Space Optical communications (FSO). This integration offe…
View article: 4 Tbps+ FSO Field Trial Over 1.8 km With Turbulence Mitigation and FEC Optimization
4 Tbps+ FSO Field Trial Over 1.8 km With Turbulence Mitigation and FEC Optimization Open
The future of wireless communication requires the unique capabilities of free-space optics (FSO). Therefore, it is crucial to develop methods for achieving reliable long-distance FSO communications. This article presents a field trial of a…
View article: Robust and cost-efficient FSO transmission using a multi-mode fiber-coupled receiver
Robust and cost-efficient FSO transmission using a multi-mode fiber-coupled receiver Open
In this work, we experimentally exploit the use of free-space optics (FSO) transmission with multi-mode fiber (MMF) coupling towards robust optical wireless communication system, with enhanced flexibility and misalignment tolerance. Such a…
View article: Experimental investigation of a long-period grating based coupler for high-capacity transmission systems
Experimental investigation of a long-period grating based coupler for high-capacity transmission systems Open
In this work, we developed and characterized a coupler based on long-period gratings (LPGs). The coupler consists of two single-mode fibers close to each other with similar LPGs inscribed, and it was optimized by adjusting the longitudinal…
View article: Optical Beam Steering in FSO Systems Supported by Computer Vision
Optical Beam Steering in FSO Systems Supported by Computer Vision Open
Free-Space Optical (FSO) communications have emerged as a viable solution to complement conventional communication technologies, mainly due to their high transmission rates, ease of implementation, low cost, and unlicensed spectrum. Howeve…
View article: Low-Complexity Frequency Packing to Enable Filtering-Tolerant DSCM Transmission
Low-Complexity Frequency Packing to Enable Filtering-Tolerant DSCM Transmission Open
Employing optimized frequency packing over digital subcarrier multiplexing (DSCM), we exploit the mitigation of WSS filtering penalties. After transmitting a 60 Gbaud 8-DSCM with 0.2 roll-off over 5-10 WSSs, we experimentally demonstrate O…
View article: On the Impact and Mitigation of Turbulence in Fiber-Coupled FSO Systems
On the Impact and Mitigation of Turbulence in Fiber-Coupled FSO Systems Open
Fiber-coupled free-space optics (FSO) communications have emerged as a promising wireless technology due to their flexibility, speed, security, and seamless integration with fiber optic systems. However, these systems are very sensitive to…
View article: Unraveling “Fiber in the Sky”: Terabit Capacity Enabled by Coherent Optical Wireless
Unraveling “Fiber in the Sky”: Terabit Capacity Enabled by Coherent Optical Wireless Open
The quest for high-speed optical wireless communications is now entering a new and ambitious phase of pursuing fiber-like capacity over the air. However, legacy optical wireless technologies relying on simple intensity modulation and direc…
View article: Digitally Mitigating Doppler Shift in High-Capacity Coherent FSO LEO-to-Earth Links
Digitally Mitigating Doppler Shift in High-Capacity Coherent FSO LEO-to-Earth Links Open
The range of applications enabled by the low-Earth orbit (LEO) constellations continues to increase, going from providing worldwide broadband internet access, to the transmission of enormous quantities of data gathered from space sensing a…
View article: Simplified Self-Coherent FSO Transmission Boosted by Digital Resolution Enhancer
Simplified Self-Coherent FSO Transmission Boosted by Digital Resolution Enhancer Open
The joint application of free-space optics (FSO) transmission with coherent detection has recently appeared to enable unprecedented optical wireless capacity. Nevertheless, due to the associated cost and power consumption, simplified self-…
View article: Requirements and Solutions for Robust Beam Alignment in Fiber-Coupled Free-Space Optical Systems
Requirements and Solutions for Robust Beam Alignment in Fiber-Coupled Free-Space Optical Systems Open
The continuous growth of Internet data traffic is pushing the current radio-frequency wireless technologies up to their physical limits. To overcome the upcoming bandwidth bottleneck, Free-Space Optics (FSO) is currently deemed as a key br…
View article: Multi-Parameter AI-Based Bandwidth Compensation for Energy-Efficient 800G Transmission
Multi-Parameter AI-Based Bandwidth Compensation for Energy-Efficient 800G Transmission Open
We propose a novel energy-efficient AI-based bandwidth compensation technique that jointly optimizes Tx and Rx static filters. Experimental demonstration in a 800G system reveals gains of more than 1 dB when compared with typical digital p…
View article: 100G FSO Transmission Using 3-Bit DAC and Self-Coherent Detection
100G FSO Transmission Using 3-Bit DAC and Self-Coherent Detection Open
Using a virtual-carrier-assisted self-coherent system aided by a digital resolution enhancement technique, we experimentally demonstrate 100 Gbps FSO transmission over an outdoor 42m link, supported by a single photoreceiver and a simplifi…
View article: Multi-Parameter AI-Based Bandwidth Compensation for Energy-Efficient 800G Transmission
Multi-Parameter AI-Based Bandwidth Compensation for Energy-Efficient 800G Transmission Open
We propose a novel energy-efficient AI-based bandwidth compensation technique that jointly optimizes Tx and Rx static filters. Experimental demonstration in a 800G system reveals gains of more than 1 dB when compared with typical digital p…
View article: Cooperative FSO and mmWave System for Reliable 200G Wireless Transmission
Cooperative FSO and mmWave System for Reliable 200G Wireless Transmission Open
The use of free-space optics (FSO) for ultra-high-speed communications has been recently standing out as a promising alternative for fiber/wireless-based scenarios. However, FSO communications still suffer from variations in the received o…
View article: Using Multi-Mode Fibers to Increase the Tolerance to Pointing Errors in Seamless FSO Links
Using Multi-Mode Fibers to Increase the Tolerance to Pointing Errors in Seamless FSO Links Open
We investigate the advantages of using a multi-mode fiber (MMF) instead of a single-mode fiber (SMF) in seamless FSO-fiber links, demonstrating that the resilience to pointing errors can be roughly doubled.
View article: Coherent Free-Space Optical Communications: Opportunities and Challenges
Coherent Free-Space Optical Communications: Opportunities and Challenges Open
The ever-increasing data rate demand for wireless systems is pushing the physical limits of standalone radio-frequency communications, thus fostering the blooming of novel high-capacity optical wireless solutions. This imminent penetration…
View article: Coherent Free-Space Optical Communications: Opportunities and Challenges
Coherent Free-Space Optical Communications: Opportunities and Challenges Open
The ever-increasing data rate demand for wireless systems is pushing the physical limits of standalone radio-frequency communications, thus fostering the blooming of novel high-capacity optical wireless solutions. This imminent penetration…
View article: 5G-Compatible IF-Over-Fiber Transmission Using a Low-Cost SFP-Class Transceiver
5G-Compatible IF-Over-Fiber Transmission Using a Low-Cost SFP-Class Transceiver Open
With the rise of 5G and beyond, the ever-increasing data-rates demanded by mobile access are severely challenging the capacity of optical fronthaul networks. Despite its high reliability and ease of deployment, legacy digital radio-over-fi…
View article: Free-Space Terabit Optical Interconnects
Free-Space Terabit Optical Interconnects Open
The continuous growth of Internet data traffic is progressively increasing the pressure over wireless access technologies. To overcome the imminent bandwidth bottleneck, free-space optics (FSO) is currently deemed as a key breakthrough tow…
View article: 800G Coherent FSO Demonstration: Datasets and Post-Processing Routines
800G Coherent FSO Demonstration: Datasets and Post-Processing Routines Open
This repository includes a set of experimental data and post-processing routines for the study of ultra-high capacity free-space optics (FSO) systems enabled coherent optical fiber transceivers operating at bit rates of 800 Gbps and above.…
View article: 800G Coherent FSO Demonstration: Datasets and Post-Processing Routines
800G Coherent FSO Demonstration: Datasets and Post-Processing Routines Open
This repository includes a set of experimental data and post-processing routines for the study of ultra-high capacity free-space optics (FSO) systems enabled coherent optical fiber transceivers operating at bit rates of 800 Gbps and above.…
View article: 5G-Compatible IF-Over-Fiber Transmission Using a Low-Cost SFP-Class Transceiver
5G-Compatible IF-Over-Fiber Transmission Using a Low-Cost SFP-Class Transceiver Open
With the rise of 5G and beyond, the ever-increasing data-rates demanded by mobile access are severely challenging the capacity of optical fronthaul networks. Despite its high reliability and ease of deployment, legacy digital radio-over-fi…
View article: Impact of the carrier contribution factor in the self-coherent DC-value method
Impact of the carrier contribution factor in the self-coherent DC-value method Open
The carrier contribution factor (CCF) is used in the DC-value method to assure the minimum phase condition (MPC) at the transmitter. We analyze the impact of the CCF estimation accuracy at the receiver on the DC-value system performance. W…
View article: Squeezing Out the Achievable Information Rate From Coherent QAM Systems Through Amplitude Modulation of CPE-Pilots
Squeezing Out the Achievable Information Rate From Coherent QAM Systems Through Amplitude Modulation of CPE-Pilots Open
We propose to perform amplitude modulation over DSP pilots commonly employed for carrier-phase estimation, utilizing the extra information rate to carry additional FEC overhead. For moderate pilot overheads of 3-6%, we demonstrate SNR gain…
View article: Adaptive optical beam alignment and link protection switching for 5G-over-FSO
Adaptive optical beam alignment and link protection switching for 5G-over-FSO Open
Free-space optics (FSO) convey an enormous potential for ultra-high-capacity seamless fiber-wireless transmission in 5G and beyond communication systems. However, for its practical exploitation in future deployments, FSO still requires the…
View article: Experimental Analysis of the Impact of Indoor Turbulence on FSO for Intra-Datacenter Communications
Experimental Analysis of the Impact of Indoor Turbulence on FSO for Intra-Datacenter Communications Open
With datacenters expanding their networks at a greater than ever rate, efficiently managing an extremely numerous a network of servers with high cabling complexity is a daunting task. This has motivated the rise of free-space optics (FSO) …