We point to the interdependence between carrier concentration and resonance detuning as the source of transient phenomena in resonant ring modulators that affect electrooptic behavior and set the upper limit of the dynamic range, thus impacting the scalability of the links based on these devices.
We review our recent work on spatial manipulation techniques for scalable space-division multiplexing in multimode fiber systems. We demonstrate principal mode-based multiplexing for significant crosstalk suppression and efficient modal control under challenging modal dynamics and mode-dependent loss.
We successfully demonstrate optical and electrical transmissions at 448 Gbps per lane bit rate, enabling research on next generation AI data centers interfaces targeting 3.2 terabit Ethernet speeds. These advancements are accomplished through conventional multi-level PAM formats and commercially available test and measurement equipment.
Spatial multiplexing within optical fibers scales coreand data center networks in capacity and security. We present a spatial phase-retrieval receiver for multimode networks using in-network reservoir computing. Phase ambiguous signals are recovered by just using intensity distributions, a common issue in AI-based methods.
We discuss a numerical model and experimental results to study the effect of spatial beam self-cleaning in nonlinear graded-index fibers and how to control such process, including transient phenomena. We examine illustrative some cases of coherent combination of cleaned beams and supercontinuum generation.
To overcome the bandwidth and sampling rate limitations of the CMOS ADCs, a high-speed analog de-multiplexer (ADEMUX) offers scalability for the future heterogeneous ADC and the wireline receivers. We discuss the design considerations of high-speed ADEMUX, including architecture comparison, and circuit design.
We experimentally demonstrate a novel approach to control the brightness of a high energy beam by leveraging its interaction with a weaker beam that differs either in polarization or in wavelength. This allows for extending the spatial beam selfcleaning process in multimode fibers to multiple beams.
We review recent advances in membrane lasers for energy-efficient datacenter interconnects, satellite lasercom, and neuromorphic photonics, highlighting recent demonstrations. Key advances in device design and integration have enabled record-low operating energies at high speeds for next-generation, high-efficiency optical systems.
We review our recent advances in the study of breathing solitons in ultrafast lasers, uncovering fascinating fractal dynamics in nonlinear systems, the intricate structure of synchronisation regions, a new state between synchronous and desynchronised phases in resonant systems, and a new pathway to chaos.
Self-feedback can be used to reduce the timing jitter of passively mode-locked lasers. However, noise can induce modulations of the pulse arrival times. We show how a second delay can suppress this modulation, thereby increasing the pulse timing stability both on short and long timescales.
Coherent Beam Combining (CBC) is a powerful technique that combines multiple lasers into a single, high-power beam. This study presents an adaptive phase control approach for CBC using the Adagrad algorithm to achieve robust realtime beam steering, offering enhanced flexibility and control for precision-driven applications.
Electronic control systems are essential to set/stabilize with high precision the operating point of PICs in light intensity and phase. When footprint, power consumption and multichannel operation is important, real-time adaptive control integrated on an electronic-photonic codesigned on a single chip ASIC is a solution.
InP-based optoelectronics plays a crucial role in enabling high-speed and energy-efficient data transmission for future optical interconnects. This presentation highlights the latest advancements in InP-based components for both direct and coherent detection schemes, addressing developments on both the transmitter and receiver sides.
We are proposing a DSP-free coherent optical link architecture suitable for datacenter applications and AI backend networking using offset-QAM modulation. This solution can be realized for both LPO and CPO to provide 400Gb/s per wavelength for next generations of intra-datacenter optical I/O.
Research and development of Non-Terrestrial Networks is actively conducted to realize an advanced information and communication network that seamlessly connects the ground and space. Satellite Optical communications will be a solution to provide the high-capacity wireless communications network for Beyond 5G and 6G.
We combine artificial neural networks and semiconductor laser dynamics to design hybrid photonic sensors. We use a semiconductor laser with optical feedback and show how physical knowledge can be incorporated into the statistical modelling via semi-supervised learning towards energy-efficient versatile sensors with embedded neural networks.
This work presents a photonic RF-sampling system using a silicon-photonic PIC and a 1-GHz 10.5-fs-jitter mode-locked laser, demonstrating photonic downconversion, sampling, and demodulation of complex QAM signals at millimeter-wave frequencies up to 70 GHz, with potential for satellite communications.
The Passive Optical Network plays a crucial role in enabling large-scale monitoring by leveraging the existing fiber infrastructure in urban scenario. Sustainable solutions are shown to ensure monitoring of the environment and detection of anomalies dangerous for the integrity of the network infrastructure itself.
This paper presents a novel radio over fiber (RoF) system using free-running lasers and phase modulation. The system efficiently generates a millimeter-wave (mmW) signal and achieves a maximum transmission capacity of 2.4 Gbps after downconversion through envelope detection, demonstrating potential for high-capacity, high-bandwidth wireless-over-fiber transmission.
We propose an implementation of optical passthrough link technology that uses an integrated photonic crossbar at the switch nodes of an Ultra Accelerator Link Pod to enable a compute node to optically connect to multiple switch nodes through a single optical fiber pair.
