A5081050482- Advanced Photonic Communication Systems
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Optical Network Technologies
- Quantum optics and atomic interactions
- Quantum Information and Cryptography
- Neural Networks and Reservoir Computing
- Advanced Optical Sensing Technologies
- Mechanical and Optical Resonators
- Quantum Mechanics and Applications
- Semiconductor Lasers and Optical Devices
- Genetics, Bioinformatics, and Biomedical Research
- Terahertz technology and applications
- Advanced Fiber Optic Sensors
- Semiconductor Quantum Structures and Devices
- Molecular Communication and Nanonetworks
- Scientific Computing and Data Management
- Optical and Acousto-Optic Technologies
- Laser-Matter Interactions and Applications
- Radiation Dose and Imaging
- Geophysics and Sensor Technology
- Quantum Computing Algorithms and Architecture
- Advanced Fluorescence Microscopy Techniques
- Dental Radiography and Imaging
- Radio Wave Propagation Studies
Institut National de la Recherche Scientifique
2015-2025
Abstract High-dimensional photon states (qudits) are pivotal to enhance the information capacity, noise robustness, and data rates of quantum communications. Time-bin entangled qudits promising candidates for implementing high-dimensional communications over optical fiber networks with processing approaching those classical telecommunications. However, their use is hindered by phase instability, timing inaccuracy, low scalability interferometric schemes needed time-bin processing. As well,...
Mitigating the stochastic noise introduced during generation, transmission, and detection of temporal optical waveforms remains a significant challenge across many applications, including radio-frequency photonics, light-based telecommunications, spectroscopy, etc. The problem is particularly difficult for weak-intensity signals often found in practice. Active amplification worsens signal-to-noise ratio, whereas mitigation based on bandpass filtering attenuates further waveform interest....
Real-time implementations of joint time-frequency analysis over instantaneous bandwidths above the GHz range remain challenging. In a companion paper, we have proposed an analog photonic processing scheme that enables computing short-time Fourier transform (STFT), or spectrogram (SP), incoming arbitrary broadband signal, tens-of-GHz bandwidths, in continuous, gapless and real-time manner. The method involves temporal sampling signal under test (SUT) with periodic train interfering, linearly...
The development of integrated photonic systems, both on-chip and fiber-based, has transformed quantum photonics by replacing bulky, fragile free-space optical setups with compact, efficient, robust circuits. Photonic platforms incorporating fiber-connected sources correlated entangled photon pairs offer practical advantages, such as operation at room temperature, efficient integration telecom infrastructure, compatibility mature semiconductor fabrication processes for cost-effective...
Abstract The ability to detect ultrafast waveforms arising from randomly occurring events is essential such diverse fields as bioimaging, spectroscopy, radio-astronomy, sensing and telecommunications. However, noise remains a significant challenge recover the information carried by waveforms, which are often too weak for detection. key issue that most of undesired contained within broad frequency band waveform, it cannot be alleviated through conventional methods. In spite intensive research...
Abstract A simple, practical method based on electro‐optic gating is experimentally shown to improve the temporal resolution of single‐photon detection by more than 16 times. Delay times between ultrafast single photons and a reference clock are stretched desired programmable sampling gate factor, allowing reconstruction delay histograms with ≈0.001 per pulse within 60 ps. By transferring bandwidth RF electronics counting, complex signals large time‐bandwidth products > 2000 temporally up...
One of the most intuitive representations a waveform is achieved through time-frequency analysis, which depicts how frequency components wave evolve over time. Time-frequency representations, such as spectrogram, are well-known for allowing full-field characterization signal in terms amplitude and phase. However, present methods to capture spectrogram only suited either relatively slow (<GHz bandwidth) waveforms arbitrary duration or fast (>THz short duration. It remains very...
We propose and experimentally demonstrate a novel type of silicon race-track resonators realized in standard SOI process with quality factors above 1.3 million. The proposed solution uses multi-mode waveguides (MMWG) couplers order to dramatically reduce the waveguide loss coupler ring cavity, therefore achieve high Q compared previous implementations without sacrificing free-spectral range. resonator has been employed an RF notch filter 150 MHz stopband 8 GHz tuning
We report a novel, to the best of our knowledge, all-optical discrete multilevel time-lens (DM-TL) design based on cross-phase modulation (XPM). In this approach, pump is synthesized such as quadratic phase applied probe in constant-level time-bins with maximum excursion 2π. As result, considerable reduction required power achieved comparison conventional approach parabolic pump. To illustrate concept, proposed DM-TL here energy-preserving conversion continuous-wave (CW) signal into train...
We propose an all-optical temporal Talbot array illuminator (T-TAI) enabling denoising passive amplification of broadband ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$>$</tex-math></inline-formula> 10 GHz-bandwidth) optical signals. The key element is ultra-fast phase grating based on cross-phase modulation. Whereas previous implementations the T-TAI suffer from bandwidth limitations inherent to...
Abstract Decimation is a common process in digital signal processing that involves reducing the sampling rate of an oversampled by linearly combining consecutive samples. Among other applications, this represents simple means to mitigate noise content signal. In work, novel optical concept inspired these operations proposed, which called Parametric‐assisted Oversampling and (POD). By using all‐fiber setup, POD processor first realizes ultra‐fast parametric oversampling incoming temporal (at...
Controlling the temporal evolution of an electromagnetic (EM) wave's frequency components, so-called time-frequency (TF) distribution, in a versatile and real-time fashion remains very challenging, especially at high speeds (> GHz regime) required contemporary communication, imaging, sensing applications. We propose general framework for manipulating TF properties high-speed EM waves. Specifically, distribution is continuously mapped along time domain through phase-only processing, enabling...
Noise is one of the rare aspects experimental work that crosses all boundaries. It present from scientific fields like ultrafast optical signal detection to applied such as image processing, or even in our day-to-day lives when we are simply trying have a conversation loud room. In these cases, incoherent, stochastic noise tends drown aim detect, and various techniques may need be employed improve clarity waveform, which characterized by signal-to-noise ratio (SNR). Yet, considering ubiquity...
We demonstrate gapless and real-time spectral analysis of broadband waveforms with >250 points per spectrum. The concept is based on a discretization an electro-optic time-lens to implement phase modulation equivalent 206.25π.
We experimentally demonstrate electronically programmable, user-defined time-varying frequency filtering of continuous broadband signals, over a 22 GHz tuning range and with >1 reconfiguration speed, using electro-optic modulation reversible time-mapped spectrogram.
We demonstrate a novel scheme based on electro-optic phase modulation following the Talbot effect that enables real-time spectrogram analysis of arbitrary signals over 40-GHz bandwidth, with MHz frequency resolution, and rates up to 220 million Fourier transforms per second.
We demonstrate an optical method based on electro-optic time lens for real-time and gapless time-frequency analysis of microwave signals, with rates up to 1.56 billion Fourier transforms per second, operation bandwidth spanning ~40 GHz, a frequency resolution <1.56 GHz. The genuine is thoroughly investigated by showing the successful detection events as short 160 ps, regardless their arrival. makes this ideally suited recovery ultrafast hop signals.
We demonstrate a photonics-based spectrogram with an operation bandwidth of 380 GHz and time resolution 62.5 ps. This proposed linear-optics based scheme allows for the analysis highly sophisticated waveforms, here shown on sub-THz signal time-bandwidth product ~1,826.
We present a photonic platform for the generation and processing of picosecond-spaced time entangled qudits, based on on-chip interferometers spiral waveguide. utilize these qudits to implement quantum communications over standard optical fibers.