A5006242251- Photonic and Optical Devices
- Optical Network Technologies
- Neural Networks and Reservoir Computing
- Advanced Photonic Communication Systems
- Advanced Fiber Laser Technologies
- Advanced Fiber Optic Sensors
- Semiconductor Lasers and Optical Devices
- Mechanical and Optical Resonators
- Optical Coatings and Gratings
- Photonic Crystals and Applications
- Advanced Optical Network Technologies
- Orbital Angular Momentum in Optics
- Laser Design and Applications
- Advanced Optical Sensing Technologies
- Spectroscopy and Laser Applications
- Microwave Engineering and Waveguides
- Speech and Audio Processing
- Quantum Information and Cryptography
- Advanced Antenna and Metasurface Technologies
- Optical Wireless Communication Technologies
- Atmospheric Ozone and Climate
- Silicon Nanostructures and Photoluminescence
- Infant Health and Development
National Research Council Canada
2022-2025
Politecnico di Milano
2017-2024
Xanadu Quantum Technologies (Canada)
2024
Consorzio di Bioingegneria e Informatica Medica
2021
Weatherford College
2020
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2020
Neural networks are widely deployed models across many scientific disciplines and commercial endeavors ranging from edge computing sensing to large-scale signal processing in data centers. The most efficient well-entrenched method train such is backpropagation, or reverse-mode automatic differentiation. To counter an exponentially increasing energy budget the artificial intelligence sector, there has been recent interest analog implementations of neural networks, specifically nanophotonic...
Thermal actuators are among the most consolidated and widespread devices for active control of photonic integrated circuits (PICs). As a main drawback, mutual thermal crosstalk actuated onto same chip can affect working point PIC reduce efficiency automated tuning calibration procedures. In this paper, strategy to cancel out effects phase coupling induced by is presented. our technique, we named eigenmode decomposition (TED), all controlled simultaneously according eigensolution thermally...
Free-space optics naturally offers multiple-channel communications and sensing exploitable in many applications. The different optical beams will, however, generally be overlapping at the receiver, and, especially with atmospheric turbulence or other scattering aberrations, arriving beam shapes may not even known advance. We show that such can still separated domain, simultaneously detected negligible cross-talk, if they share same wavelength polarization, unknown shapes. kernel of adaptive...
Abstract Flexible optical networks require reconfigurable devices with operation on a wavelength range of several tens nanometers, hitless tuneability (i.e. transparency to other channels during reconfiguration), and polarization independence. All these requirements have not been achieved yet in single photonic integrated device this is the reason why potential photonics still largely unexploited nodes communication networks. Here we report fully-reconfigurable add-drop silicon filter, which...
As blockchain technology and cryptocurrency become increasingly mainstream, photonic computing has emerged as an efficient hardware platform that reduces ever-increasing energy costs required to verify transactions in decentralized cryptonetworks. To reduce sensitivity of these verifications error, we propose experimentally demonstrate a cryptographic scheme, LightHash, implements robust, low-bit precision matrix multiplication programmable silicon networks. We error mitigation scheme by...
This article presents the key ingredients and best practices for implementing simple, effective robust control calibration procedures arbitrary photonic integrated circuit (PIC) architectures. Three main features are presented discussed: a technique to cancel out effects of mutual crosstalk among thermal tuners, exploitation labelling identify different optical signals, use input modulated signal automatically reshape frequency response device. Examples application then illustrated show...
Abstract Efficient fiber-chip coupling interfaces are critically important for integrated photonics. Since surface gratings diffract optical signals vertically out of the chip, these couplers can be placed anywhere in circuit allowing wafer-scale testing. While state-of-the-art grating have been developed silicon-on-insulator (SOI) waveguides, moderate index contrast silicon nitride (SiN) presents an outstanding challenge implementing efficient on this platform. Due to reduced strength, a...
Real-time control of multiple cascaded devices is a key requirement for the development complex silicon photonic circuits performing new sophisticated optical functionalities. This article describes how dithering technique can be leveraged in combination with non-invasive light probes to independently working point many components. The standard extended by introducing concept orthogonal signals simultaneously discriminate effect different actuators, while idea frequency re-use discussed...
Photonic integrated circuits (PICs) play a pivotal role in many applications. Particularly powerful are based on meshes of reconfigurable Mach-Zehnder interferometers as they enable active processing light. Various possibilities exist to get light into such circuits. Sampling an electromagnetic field distribution with carefully designed free-space interface is one them. Here, PIC used optically sample and process beams so implement spatially resolving detector amplitudes phases. In order...
Abstract Programmable photonic circuits require an electronic control layer to configure and stabilize the optical functionality at run‐time. Such action is normally implemented by supervising status of circuit with integrated light monitors providing feedback signals actuators. This paper demonstrates that can be effectively performed electrical are time‐multiplexed directly on chip. To this aim, necessary functionalities monolithically in a conventional 220 nm silicon photonics platform no...
Photonic integration in a silicon nitride (SiN) platform enables low propagation losses and wide transparency range, making it ideal for quantum applications. However, polarization control SiN is challenging because of its birefringence. This work demonstrates beam splitters using asymmetric directional couplers SiN, designed 950 nm 1300 wavelengths. These devices exhibit insertion (<1 dB) high extinction ratios (20 dB-30 dB).
Surface grating couplers are an important component for interfacing photonic integrated circuits with optical fibers. However, conventional coupler designs typically provide limited performance due to low directionality and poor fiber-to-grating field overlap. The efficiency can be improved by using non-uniform structures at the expense of small critical dimensions complicating fabrication process. While uniform gratings alleviate this constraint, they produce exponentially decaying...
Given the escalation of demand for high-speed data interconnection, both between users and datacenters, high-capacity optical networks need a boost in capacity, flexibility, efficiency. To stand up those problems, network reconfigurability is key feature saturated power hungry operating scenario. In this paper, reconfigurable node, using commercial integrated photonics foundry, was conceived, fabricated, tested. A novel application automatic control complex circuits involving locking tuning...
In technologies operating at light wavelengths for wireless communication, sensor networks, positioning, and ranging, a dynamic coherent control manipulation of fields is an enabling element properly generating correctly receiving free-space optical (FSO) beams even in the presence unpredictable objects turbulence path. this work, we use programmable mesh Mach–Zehnder (MZI) interferometers to automatically complex field radiated captured by array antennas. The implementation local feedback...
Abstract Programmable feedforward photonic meshes of Mach–Zehnder interferometers are computational optical circuits that have many classical and quantum computing applications including machine learning, sensing, telecommunications. Such devices can form the basis energy-efficient neural networks, which solve complex tasks using photonics-accelerated matrix multiplication on a chip, may require calibration training mechanisms. benefit from internal power monitoring physical gradient...
Continuously variable true-time optical delay lines are typically subject to a constraint of the bandwidth-delay product, limiting their use in several applications. In this Letter, we propose an integrated topology that breaks product limit. The device is based on multiple Mach-Zehnder Interferometers (MZIs) arranged parallel, providing easier control and larger bandwidth compared ring resonator-based solutions. functionality architecture demonstrated with 4-stage line by performing...
Silicon Nitride photonic integrated circuits are highly sought after for quantum applications. This platform offers ultra-low propagation losses, reduced birefringence, and a wide transparency window. study presents the design experimental demonstration of compact silicon nitride polarization beam splitter (PBS) 950 nm wavelength range. The PBS employs cascaded tapered asymmetric directional couplers to achieve efficient control. With insertion losses below 1 dB, extinction ratios exceeding...
Neural networks are widely deployed models across many scientific disciplines and commercial endeavors ranging from edge computing sensing to large-scale signal processing in data centers. The most efficient well-entrenched method train such is backpropagation, or reverse-mode automatic differentiation. To counter an exponentially increasing energy budget the artificial intelligence sector, there has been recent interest analog implementations of neural networks, specifically nanophotonic...
Exploiting a novel channel labeling scheme, we demonstrate automated tuning and locking of hitless silicon microring-resonator filter. Hitless with more than 30 dB isolation is achieved, enabling application in add-drop reconfigurable architectures.
Many optoelectronic devices embedded in a silicon photonic chip, like photodetectors, modulators, and attenuators, rely on waveguide doping for their operation. However, the level of is not always reflecting an equal amount free carriers available conduction because charges trap energy states inevitably present at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mi mathvariant="normal">S</mml:mi>...
Photonic integrated meshes made of tuneable interferometers enable implementation functions programmable on demand and are being envisioned as the optical counterpart electronic field gate arrays. Several examples photonic processors capable performing arbitrary linear operations have been recently proposed, expected to find applications in different areas, from on-chip processing telecom signals microwave photonics, quantum optics neural networks. In this work, we use a reconfigurable mesh...
Optical phase measurement is critical for many applications, and traditional approaches often suffer from mechanical instability, temporal latency, computational complexity. In this paper, we describe compact sensor arrays based on integrated photonics, which enable accurate scalable reference-free sensing in a few steps. This achieved by connecting multiple two-port sensors into graph to measure relative phases between neighboring distant spatial locations. We propose an efficient...