A5037385637- Optical Network Technologies
- Advanced Photonic Communication Systems
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Photonic Crystal and Fiber Optics
- Advanced Optical Network Technologies
- Advanced Fiber Optic Sensors
- Advancements in PLL and VCO Technologies
- Solid State Laser Technologies
- Mechanical and Optical Resonators
- Laser-Matter Interactions and Applications
- Optical Coherence Tomography Applications
- Photoacoustic and Ultrasonic Imaging
- PAPR reduction in OFDM
- Photonic Crystals and Applications
- Network Time Synchronization Technologies
- Nanowire Synthesis and Applications
- Electron Spin Resonance Studies
- Spectroscopy and Laser Applications
- Advanced MRI Techniques and Applications
- Photorefractive and Nonlinear Optics
- Photodynamic Therapy Research Studies
- Cellular Automata and Applications
- Laser Material Processing Techniques
University of Southampton
2016-2025
Technical University of Denmark
2006-2015
Ørsted (Denmark)
2009-2015
University of Copenhagen
2010-2014
Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute
2010
Tohoku University
2010
Photonics (United States)
2008-2009
Eindhoven University of Technology
2007-2008
Optica
2008
For over 50 years, pure or doped silica glass optical fibres have been an unrivalled platform for the transmission of laser light and data at wavelengths from visible to near infra-red. Rayleigh scattering, arising frozen-in density fluctuations in glass, fundamentally limits minimum attenuation these hence restricts their application, especially shorter wavelengths. Guiding hollow (air) core offers a potential way overcome this insurmountable limit set by glass's but requires reduction all...
We report the first double-nested antiresonant hollow core fiber. The fiber matches loss of commercial solid fibers in C-band (0.174 dB/km) and fundamentally improves it (0.22 O-band.
We have generated a single-wavelength data signal with capacity of 5.1 Tbit/s.The enabling techniques to generate the are optical time-division multiplexing up symbol rate 1.28 Tbaud, differential quadrature phase shift keying as format, and polarisationmultiplexing.For first time, error-free performance bit error less than 10 -9 is demonstrated for Tbit/s signal.This achieved in back-to-back configuration using direct detection receiver based on polarisation-and time-demultiplexing,...
Abstract Hollow‐core fiber (HCF), in which >99.99% of the light is guided a central air (or vacuum) filled core, radically new technology offering potential to overcome nonlinear limits associated with delivery high‐brightness laser pulses over long distances conventional solid‐core fiber. Overcoming these particularly challenging at visible wavelengths where core sizes single‐mode fibers (SMFs) are reduced. In this work, near‐diffraction‐limited, kilowatt‐peak‐power, sub‐nanosecond green...
Abstract Mamyshev oscillator (MO) represents a powerful mode‐locking technique to produce high energy and ultrashort pulses from fiber system. However, it is challenging achieve low repetition rates directly an while fully exploiting the outstanding characteristics of MOs due constraint large dispersion nonlinearity conventional solid‐core fibers. Here, new method combining low‐dispersion low‐nonlinearity hollow‐core (HCF) with MO proposed overcome problem, achieving reduction in rate 20 1...
We report the first demonstration of error-free 640 Gbit/s demultiplexing using Kerr non-linearity an only 5 cm long chalcogenide glass waveguide chip. Our approach exploits four-wave mixing by instantaneous nonlinear response chalcogenide. Excellent performance is achieved with 2 dB average power penalty and no indication error-floor. Characterisation FWM efficiency for given confirms good device.
A 1.28 Tbaud data signal is demonstrated, which the highest symbol rate yet reported. The formed by optical time-division multiplexing of 128 channels at 10 Gbit/s OOK in a single polarisation. generated Tbit/s demultiplexed nonlinear loop mirror, resulting error-free performance with BER<10−9 for all channels.
We have successfully demonstrated all-optical wavelength conversion of a 640-Gbit/s line-rate return-to-zero differential phase-shift keying (RZ-DPSK) signal based on low-power four wave mixing (FWM) in silicon photonic chip with switching energy only ~110 fJ/bit. The waveguide dispersion the nanowire is nano-engineered to optimize phase matching for FWM and power used processing low enough reduce nonlinear absorption from two-photon-absorption (TPA). These results demonstrate that...
We report the first demonstration of polarisation insensitive all-optical wavelength conversion (AOWC) for single channel 640 Gbit/s return-to-zero differential-phase-shift-keying (RZ-DPSK) signal and 1.28 Tbit/s multiplexed (Pol-Mux) RZ-DPSK signals using a 100-m polarisation-maintaining highly nonlinear fiber (PM-HNLF) in diversity loop configuration. The AOWC is based on four-wave mixing PM-HNLF. Error free performance achieved converted signals. Less than 0.5 dB sensitivity obtained.
This paper reports on the utilization of timedomain optical Fourier transformation (OFT) technique for serial-to-parallel conversion time division multiplexed (OTDM) data tributaries into dense wavelength (DWDM) channels.The OFT is implemented by using a dispersive medium followed phase modulation; latter being achieved four-wave mixing process with linearly chirped pump pulses.Both numerical and experimental investigations OTDM-to-WDM are carried out.Experimental validations performed...
We report a hollow core Nested Antiresonant Nodeless Fibre (NANF) with loss of 0.65dB/km across the full C and L telecommunication bands. The fabricated fibre is 1.23km long, it effectively single moded over sufficiently long lengths, able to transmit data.
We theoretically explore the fundamental limits on efficiency of coupling light into hollow-core antiresonant fibres. study in particular a free-space Gaussian beam to guided modes one most successful fibre (ARF) geometries, nested nodeless (NANF). Through finite element simulations, we effect geometrical parameters efficiency, showing that LP <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math...
In this paper, we describe our recent work on signal processing of terabit per second optical serial data signals using pure silicon waveguides. We employ nonlinear in nanoengineered waveguides to perform demultiplexing and waveform sampling 1.28-Tbit/s as well wavelength conversion up 320-Gbit/s signals. demonstrate that the are equally useful for amplitude phase-modulated
Atmospheric air-filled hollow core (HC) fibers, representing the simplest yet reliable form of gas-filled fiber, show remarkable nonlinear properties and have several interesting applications such as pulse compression, frequency conversion supercontinuum generation. Although propagation sub-picosecond few hundred picosecond pulses are well-studied in response air to with a duration picoseconds has features that not been explored fully. Here, we experimentally theoretically study ~6 ps three...
We demonstrate conversion from 64 × 10 Gbit/s optical timedivision multiplexed (OTDM) data to dense wavelength division (DWDM) with 25 GHz spacing.The is achieved by time-domain Fourier transformation (OFT) based on four-wave mixing (FWM) in a 3.6 mm long silicon nanowire.A total of 40 out tributaries OTDM-DPSK signal are simultaneously converted bit-error rate (BER) performance below the 2 -3 FEC limit.Using 50 m highly nonlinear fiber (HNLF) for higher FWM efficiency, 43 OTDM-OOK...
We have demonstrated the generation of a 320 Gb/s Nyquist-OTDM signal by rectangular filtering on an RZ-OTDM with filter bandwidth (320 GHz) equal to baud rate Gbaud) and reception such using polarization-insensitive time-domain optical Fourier transformation (TD-OFT) followed passive filtering.After time-to-frequency mapping in TD-OFT, its characteristic sinc-shaped trace is converted into orthogonal frequency division multiplexing (OFDM) spectra for each subcarrier.The subcarrier spacing...
This paper presents the first demonstration of use a periodically poled lithium niobate device for signal processing at 640 Gbit/s. Clock recovery is performed successfully using device, and clock used to control nonlinear fiber-based demultiplexer. The full 640-Gbit/s system gives error-free performance with no pattern dependence there less than 1-dB power penalty after 50-km fiber transmission.
We demonstrate a high-quality cavity-free 10 GHz 680 fs pulse source starting from continuous wave (CW) laser.The is employed in 640 Gbit/s on-off keying (OOK) OTDM data generation and demultiplexing experiment, where the error-free bit error rate (BER) performance confirms high quality.The based on linear compression stage followed by two polarization-independent non-linear stages.The relies phase modulator, which used to generate chirp dispersive element compensate chirp.The stages are...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> In this paper, all-optical wavelength conversion by cross-phase modulation in a highly nonlinear fiber is investigated. Regenerative properties of the converter are demonstrated, and effect adding Raman gain to enhance performance shown. The scheme demonstrated at record-high bit rate 640 Gb/s. </para>
Pre-scaled clock recovery of a serial 640 Gbit/s data signal is demonstrated using quasi-phase-matching periodically poled lithium niobate module as an ultrafast phase comparator in optoelectronic phaselocked loop.
We report on the use of a novel all-fiber flat-top pulse shaping technique for improving performance and timing jitter tolerance switch made 640-10 Gb/s signal demultiplexing. The is increased to almost 30% one-bit time window, an increase receiver sensitivity by 13 dB compared nonflat-top reported.
Demonstration of all-optical packet switching at 160 Gb/s over a total 110-km field installed optical fiber link is reported. The switch architecture based solely on photonic circuits: an filter as label processor, flip-flop memory element and ultrafast wavelength converter router. Both uses semiconductor amplifiers which allows for integration. operates low power levels shows potential scalability. Error-free operation shown without forward error correction technology.
This paper reports on the generation of 1.6-ps full-width at half-maximum flat-top pulses by optical Fourier transform technique, and utilization these in a 320-Gb/s demultiplexing experiment. It is demonstrated how narrow pulse having 15-nm wide third-order super-Gaussian spectral intensity profile mapped into resembling its spectrum simple propagation SMF. Theoretical experimental descriptions are given generation, an validation systems performance carried out, demonstrating benefit terms...