A5101975481- Optical Network Technologies
- Advanced Fiber Laser Technologies
- Advanced Photonic Communication Systems
- Photonic Crystal and Fiber Optics
- Advanced Optical Network Technologies
- Laser-Matter Interactions and Applications
- Photonic and Optical Devices
- Solid State Laser Technologies
- Semiconductor Lasers and Optical Devices
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Advanced Fiber Optic Sensors
- Laser Design and Applications
- Nonlinear Photonic Systems
- Glycosylation and Glycoproteins Research
- Nonlinear Waves and Solitons
- Gyrotron and Vacuum Electronics Research
- Photocathodes and Microchannel Plates
- Silicon and Solar Cell Technologies
- Carbohydrate Chemistry and Synthesis
- Photorefractive and Nonlinear Optics
- Advanced X-ray Imaging Techniques
- Cell death mechanisms and regulation
- Industrial Automation and Control Systems
IBM (Brazil)
2024
IBM (United Kingdom)
2024
Interface (United States)
2024
Brookhaven National Laboratory
2024
Fusion for Energy
2015-2021
BT Group (United Kingdom)
1997-2020
Brookhaven College
2019
BT Research
1995-2018
Genesis Health System
2018
Innovate UK
2011-2012
By recirculating 55-psec soliton pulses (λs ~ 1600 nm) many times around a closed 42-km loop with loss exactly compensated by Raman gain (λp 1497 nm), we have successfully demonstrated pulse transmission, without electronic regeneration, over distances in excess of 4000 km.
We study the shaping of picosecond-duration optical pulses by intensity-dependent transmission characteristics a fiber loop mirror in normally dispersive region. Experimental results for sech2 intensity input profiles are good agreement with theoretical predictions. In addition, substantial background radiation emerge both compressed and pedestal free.
Using numerical simulation, we show that solitons of any pulse width can avoid splitting or excessive broadening in response to birefringence randomly varying orientation as long the fiber's polarization-dispersion parameter (in psec/km((1/2))) is less than ~0.3D((1/2)), where D dispersion psec nm(-1) Km(-1)). Nevertheless, also find polarization tends produce a significant amount dispersive wave radiation from soliton.
The authors report the first demonstration of all-optical header recognition and self-routing ultrafast packets with multibit addresses. A single optical AND gate recognises 6 bit 'keyword' codes, allowing 100 Gbit/s packets. [This Letter appeared in print 1995, issue 17, p.1475–1476, has been reprinted because significance corrections.]
We demonstrate experimentally an all-optical signal regenerator capable of ultrafast operation. An input data stream first forces mode locking a cw fiber laser that generates continuous optical pulses at the line rate. This recovered clock is then modulated by in nonlinear loop mirror. show regenerated have less intensity variation and temporal jitter than incoming data.
We have studied the interaction of ~55-psec-duration soliton pulse pairs over thousands kilometers optical fiber with loss periodically compensated by Raman gain. indeed observe expected short-range, phase-dependent interaction. But we also a long-range, phase-independent caused dispersive-wave radiation from solitons.
A novel all-optical clock recovery scheme in which an optical data stream is used to mode-lock a fibre laser at (or integer multiple of) the line rate experimentally demonstrated. length of transmission shared with and mode locking occurs through process crossphase modulation.
All-optical clock recovery at bit rates up to 40 Gbit/s using a modelocked fibre ring laser is demonstrated. The configuration simultaneously performs timing extraction and pulse reshaping give continuous stream of closely transform limited picosecond duration pulses.
We present results from the first gridless networking field trial with flexible spectrum switching nodes and 620 km of installed fibre links. Signals at 10G, 12.25G, 42.7G, DP-QPSK 40G, 100G 555G are generated, successfully transported switched using flexible, custom allocation per channel. Spectrum defragmentation is demonstrated integrated SOA-MZI wavelength converters. Results show error-free end-to-end performance (BER<1e-9) for OOK channels good pre-FEC BER sufficient margin to FEC...
Soliton propagation in a fiber described by the nonlinear Schrödinger equation presence of large periodic energy variations is examined. Stable can be achieved provided that soliton period long compared with variation and (associated) average (peak) pulse power equals fundamental power. The result used to interpret recent experiments on mode-locked, high-gain erbium lasers.
The switching of a 20 Gbit/s pulse train at 2.5 in an all-fibre NOLM is demonstrated. An entirely semiconductor case powered configuration was used with long loop (6.4 km) ensuring low power (10 mW) for the pulses.
Soliton pulses of 2–3.5 ps duration have been generated at 1.56μ from a mode-locked erbium-doped fibre laser. The shortest recorded (1.2ps in duration) were conjunction with low level pedestal component.
Objectives in development of the solar plant for Telstar spacecraft were to provide a power source which would withstand launching stresses and expected space environment, with optimum end-of-life performance. Radiation damage silicon cells is primary factor limiting their useful life; effect energetic protons or electrons generation recombination centers reduce minority-carrier diffusion length therefore long-wave response cell. The use n-on-p structure, preference conventional p-on-n...
The authors report the first demonstration of all-optical header recognition and self-routing ultrafast packets with multibit addresses. A single optical AND gate recognises 6 bit 'keyword' codes, allowing 100 Gbit/s packets. [This article has been reprinted due to significance corrections. appears in 1995, issue 25, p.2201–2202.]
A novel method of all-optical active mode locking which relies on the nonlinear process crossphase modulation is described. Mode achieved by using a stream optical pulses propagating along length fibre to provide periodic phase perturbation laser cavity. The technique demonstrated an erbium-doped ring laser.
A diode-pumped, integrated erbium fibre ring laser has been mode-locked at frequencies up to 14 GHz using a high speed lithium niobate amplitude modulator. Pulses of 20–30 ps duration have generated with mean output powers 7.5 mW. In addition, the could be efficiently tuned over 1.52–1.57μm wavelength region.
4 ps pulses with low temporal jitter (0.6 ps) and reduced pedestal (> 25 dB extinction) have been generated from a 1548 nm gain switched distributed feedback laser diode (DFB) pulse source at 2.5 GHz using continuous wave (CW) light injection for suppression an electroabsorption modulator (EAM) suppression.
We successfully demonstrated, for the first time, 1.4Tb/s real-time Alien Superchannel over a 410km EDFA-only field fiber link using software reconfigurable DP-16QAM/QPSK production hardware, achieving spectral efficiency up to 5.7bit/s/Hz and long term error-free performance.
Passive mode locking of a cw Rhodamine 700 dye laser is reported for the first time to our knowledge. By using two saturable absorber dyes, DOTCI and HITCI, continuous-output trains subpicosecond pulses have been obtained in 727–740- 762–778-nm spectral regions, respectively. addition fast-recovery-time (DCI) absorber, as short 350 fsec at 740 am generated.
We report the first successful real-time optical superchannel field trials of 5.6 Tb/s over 359 km and 2 a live 727 flexible grid link using production grade 64 GBaud rate transponders. Up to superchannels were successfully demonstrated fully managed link, where comprises maximum 28 × 200 G DP - QPSK subchannels. A 100 GE client signal was transported all subchannels, demonstrating stable, long term end-to-end error free performance. record net spectral efficiency 3.92 bit/s/Hz achieved for...
The authors demonstrate enhanced soliton transmission control over global distances. A stream of clock pulses can be used to retime (shepherd) high-speed data via a nonlinear interaction in length fibre.
Mode-locked operation of a diode-pumped erbium doped fibre laser is described in which an optically written Bragg reflection grating used to define the operating wavelength. Pulses 35 ps duration have been generated at repetition rate 5 GHz with mean (peak) output powers 5mW(29mW).
We report the first successful trial of real-time gridless 800G super-channel over a 410km DCM-less, EDFA-only fibre link using production grade DP – 16QAM, demonstrating 4.76b/s/Hz spectral efficiency, stable error free performance and robust PMD tolerance.