A5080425779- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Advanced Fiber Laser Technologies
- Optical Network Technologies
- Photonic Crystal and Fiber Optics
- Semiconductor Lasers and Optical Devices
- Advanced Photonic Communication Systems
- Plasmonic and Surface Plasmon Research
- Optical Coatings and Gratings
- Photonic Crystals and Applications
- Laser Material Processing Techniques
- Mechanical and Optical Resonators
- Laser-Matter Interactions and Applications
- Solid State Laser Technologies
- Photorefractive and Nonlinear Optics
- Optical Coherence Tomography Applications
- Advanced Optical Network Technologies
- Laser Design and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Neural Networks and Reservoir Computing
- Advanced MEMS and NEMS Technologies
- Orbital Angular Momentum in Optics
- Surface Roughness and Optical Measurements
- Advanced Surface Polishing Techniques
- Gold and Silver Nanoparticles Synthesis and Applications
University of Southampton
2016-2025
TRUMPF (United Kingdom)
2021-2024
École Polytechnique Fédérale de Lausanne
2011-2023
Syngenta (Switzerland)
2018-2023
Eurogentec (Belgium)
2022-2023
Oxford Lasers (United Kingdom)
2013-2022
Laser 2000 (United Kingdom)
2006-2015
Hong Kong Polytechnic University
2013
École Normale Supérieure - PSL
2011-2012
Worcester Polytechnic Institute
2011
It is now widely recognized that erbium-doped fiber amplifiers have revolutionized optical communications. EDFAs not only made single-channel, multigigabit-rate, long-distance communications possible, but they also opened up a wide variety of additional possibilities Such as soliton generation and transmission multichannel wavelength-division multiplexing While at AT&T Bell Labs (he Alcatel-Alsthom Recherche in suburb Paris, France) Emmanuel Desurvire became heavily involved contributed...
High confinement, integrated silicon nitride (SiN) waveguides have recently emerged as attractive platform for on-chip nonlinear optical devices.The fabrication of high-Q SiN microresonators with anomalous group velocity dispersion (GVD) has enabled broadband frequency comb generation.Such combs been successfully applied in coherent communication and ultrashort pulse generation.However, the reliable high confinement from stoichiometric, stress remains challenging.Here we present a novel...
Octave-spanning, self-referenced frequency combs are applied in diverse fields ranging from precision metrology to astrophysical spectrometer calibration. In the past decade, Kerr comb generators have emerged as alternative scheme offering chip-scale integration, high repetition rate and bandwidths that only limited by group velocity dispersion. The recent observation of operating dissipative soliton (DKS) regime, along with dispersive wave formation, has provided means for fully coherent,...
The generation of dissipative Kerr solitons in optical microresonators has provided a route to compact frequency combs high repetition rate, which have already been employed for synthesizers, ultrafast ranging, coherent telecommunication and dual-comb spectroscopy. Silicon nitride (Si$_3$N$_4$) are promising photonic integrated soliton microcombs. Yet date, formation Si$_3$N$_4$ at electronically detectable rates, typically less than 100 GHz, is hindered by the requirement external power...
Presents an efficient method for the design of complex fiber Bragg gratings. The relies on synthesis impulse response grating by means a differential layer-peeling algorithm. algorithm developed takes into account all multiple reflections inside grating, giving exact solution to inverse scattering problem. Its low algorithmic complexity enables long is illustrated designing several filters with interest optical communication systems: dispersionless bandpass and second- third order dispersion...
A new and flexible technique for producing photorefractive fibre gratings with a uniform phase mask is demonstrated. By slowly moving the relative to as writing beam scanned, wavelength shifts, pure apodisation phase-shifted can be achieved.
Selective excitation of spheroidal whispering gallery modes and bottle in a robust microresonator fabricated straightforwardly from short section optical fiber is demonstrated. Characteristic resonance spectra long-cavity were obtained by using tapered to excite evanescently at different points along its axis. Compared bare-fiber cylindrical resonators, the results 35x increase observed Q factor.
An ideal photonic integrated circuit for nonlinear applications requires high optical nonlinearities and low loss. This work demonstrates a heterogeneous platform by bonding lithium niobate (LN) thin films onto silicon nitride (Si3N4) waveguide layer on silicon. It not only provides large second- third-order coefficients, but also shows propagation loss in both the Si3N4 LN-Si3N4 waveguides. The tapers enable low-loss-mode transitions between these two is essential various on-chip...
Offering open-access silicon photonics-based technologies has played a pivotal role in unleashing this technology from research laboratories to industry. Fabless enterprises rely on the of these for their product development. In last decade, diverse set with medium and high readiness levels have emerged. This paper provides review nitride photonic IC offered by pilot lines European institutes companies. The also highlights upcoming features platforms discusses how they address long-term market needs.
Selective excitation of whispering-gallery and bottle modes in a robust hollow-bottle optical microresonator, fabricated from silica microcapillary by pressure-compensated, "soften-and-compress" method, is demonstrated. Characteristic resonance spectra were obtained using tapered fiber coupled at different locations along the hollow bottle. The spectral characteristics (Q-factor, efficiency) are shown to have high tolerance angular misalignment fiber. In addition, introduction localized...
We report on fabrication of high-confinement and low loss silicon nitride (Si <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> N xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> ) waveguides using the photonic Damascene process. This process scheme represents a novel approach enabling reliable, wafer-scale highconfinement optical waveguides. A reflow step silica preform reduces sidewall scattering to values not attainable with...
Transverse mode instability (TMI) is compared to thermal lensing (TL) power threshold and used derive scaling limits in high-power fiber amplifiers. The TMI shown be ~65% of the TL one dominates scaling. In addition commonly limiting effects, we introduce a bend-induced mechanical reliability criterion, which maximum allowable cladding diameter ~600μm. This also results introduction critical pump brightness, minimum required brightness at signal achieved. achievable depends primarily on...
The dispersion characteristics of apodized, linearly chirped fiber Bragg gratings and their potential as compensators have been studied systematically. It is shown that the positive hyperbolic-tangent profile results in an overall superior performance, it provides highly linearized time-delay with minimum reduction linear dispersion. To compensate for 100 km standard telecom over certain bandwidth (in nanometers), required grating length 19.24 cm/nm.
We present experimental results of complex grating structures fabricated with uniform phase masks by the moving fiber-scanning beam approach. Pure apodized gratings side-mode-suppression levels in excess 40 dB, self-apodized linearly chirped gratings, and shifted narrow-band transmission peaks have all been realized.
We demonstrate a pulsed ytterbium-doped fiber master-oscillator power amplifier source at 1060 nm producing over 300 W of average in 20-ps pulses 1-GHz repetition rate. The generated by gain-switched diode were compressed chirped Bragg grating and amplified without any distortion with excellent spectral quality. This master oscillator system offers versatility potential for further scaling.
This paper presents the first prototype of a magnetic resonance imaging (MRI) compatible piezoelectric actuated robot integrated with high-resolution fiber optic sensor for prostate brachytherapy real-time in situ needle steering capability 3T MRI. The 6-degrees-of-freedom (DOF) consists modular 3-DOF driver fiducial tracking frame and Cartesian stage. provides cannula rotation translation (2-DOF) stylet (1-DOF). mimics manual physician gesture by two point grasping. To render proprioception...
In this paper, we summarize the fundamental properties and review latest developments in high power ytterbium-doped fiber (YDF) lasers. The is focused primarily on main laser configurations related cladding pumping issues. Special attention placed pump combination techniques parameters that affect brightness enhancements observed also includes major limitations imposed by nonlinearities other parasitic effects, such as optical damage, modal instabilities photodarkening. paper summarizes...
Abstract Optical frequency combs enable precision measurements in fundamental physics and have been applied to a growing number of applications, such as molecular spectroscopy, LIDAR atmospheric trace‐gas sensing. In recent years, the generation has demonstrated integrated microresonators. Extending their spectral range visible is generally hindered by strong normal material dispersion scattering losses. this paper, we report first realization green‐light comb high‐ Q silicon nitride (SiN)...
Photonic integration technologies have spread in the past decade by means of foundry models that mirror electronic-integrated circuit industry developments century. Several monolithic exist, based on silicon and III-V semiconductors. In this paper, we discuss current state forthcoming open access photonic foundries whose technology platforms are nitride material. The paper presents various foundries, alongside with supported generic process design kits. Technical features, enabled different...
Structured light, with spatially varying phase or polarization distributions, has given rise to many novel applications in fields ranging from optical communication laser-based material processing. However the efficient and flexible generation of such beams a compact laser source at practical output powers still remains great challenge. Here we describe an approach capable addressing this need based on coherent combination multiple tailored Gaussian emitted multicore fibre (MCF) amplifier....
Coherent beam combination of multiple fibres can be used to overcome limitations such as the power handling capability single fibre configurations. In a scheme, focal intensity profile is critically dependent upon relative phase each and so precise control over channel essential. Determining required compensations from alone (as measured via camera) extremely challenging with large number information obfuscated. Whilst iterative methods exist for retrieval, in practice, due noise within...
The effect of nonideal dispersion and reflection characteristics chirped fiber gratings on the performance 10-Gb/s nonreturn-to-zero-transmission systems operating over standard is investigated. system penalty for different amplitude period ripples are quantified. Analyses an experimental grating confirm that current fabrication technology can meet requirements <1-dB-penalty operation.
A sinc-sampled fiber Bragg grating is used to achieve multiplication of the repetition rate a pulse stream from 10 40 GHz. The spectral characteristics ensure that resultant pulses—solitons 3.4-ps width—have same individual as those input.