A5046143469- Optical Network Technologies
- Advanced Photonic Communication Systems
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Advanced Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Optic Sensors
- Neural Networks and Reservoir Computing
- Mechanical and Optical Resonators
- Photonic Crystal and Fiber Optics
- Quantum optics and atomic interactions
- Laser-Matter Interactions and Applications
- Cryptographic Implementations and Security
- Quantum Information and Cryptography
- Power Line Communications and Noise
- Network Packet Processing and Optimization
- Solid State Laser Technologies
- Photorefractive and Nonlinear Optics
- Algorithms and Data Compression
- Nonlinear Photonic Systems
BT Research
1995-2025
Applied Photonics (United Kingdom)
2004-2011
National Technical University of Athens
2006-2010
University of Essex
2005
Corning (United States)
2002
University of Suffolk
2001
BT Group (United Kingdom)
1998-1999
Suffolk University
1992-1994
University of St Andrews
1993
Recent advances in developing nonlinear optical techniques for processing serial digital information at high speed are reviewed. The field has been transformed by the advent of semiconductor devices capable operation 100 gigabits per second and higher, well beyond current limits commercial electronics. These expected to become important future high-capacity communications networks allowing regeneration other functions be performed on data signals “on fly” domain.
Recent progress in the use of semiconductor laser amplifiers (SLA's) for high-speed all-optical switching is reviewed. We show that, despite SLA's having lifetimes ⩾100 ps, they are, to date, most promising material system ultrafast signal processing. highlight role SLA carrier dynamics, which permits rates faster than recovery time. Experimental results are presented that imply as much ∼100 GHz should be possible. experiments described SLA-based switches were incorporated into novel architectures.
A 40 Gbit/s all-optical XOR gate that uses a novel topology to allow high-speed operation is demonstrated. The used Mach-Zehnder interferometer comprising hybrid-integrated planar silica waveguide structure and semiconductor optical amplifiers.
A filterless coherent PON with channel spacing down to 2.8 GHz and real-time processing in an FPGA is demonstrated. 64-channel operation verified experimentally using SSB generation at the OLT fully integrated ONU transceivers.
A multiwavelength comb is obtained from Er3+- and Nd3+-doped fiber lasers by incorporation of a section multimode optical into an otherwise single-mode ring cavity. This combination types acts as wavelength-dependent filter in the laser through spatial mode beating between LP01 LP11 modes fiber.
We present a hybrid dense wavelength-division-multiplexed time-division multiple access passive optical network (DWDM-TDMA PON) with record performance in terms of reach (135.1 km which 124 were field-installed fibers), number supported units (ONUs-8192) and capacity (symmetric 320 Gb/s). This was done using 32-, 50-GHz-spaced downstream wavelengths another upstream wavelengths, each carrying 10 Gb/s traffic (256 ONUs per wavelength, operated burst mode). The channels based upon DFB lasers...
We discuss recent progress in the development of optically amplified, long reach passive optical networks, which aim to significantly reduce network complexity and cost by integrating metro access into a single, all-optical communication system.
The overall bandwidth of guided acoustic-wave Brillouin scattering has been measured in optical fibers with different fiber core diameters. relative intensity the light produced by acoustic modes is compared theory and shows good agreement when its polymer jacket removed. mode intensities linewidths a jacketed are modified selective damping individual modes.
In this paper, a programmable binary pattern recognition system that also indicates the temporal position of matched target sequence is described. The employs all-optical logic gates, and number gates required by independent length bit sequence. Experimental results with 42.6 Gb/s input data patterns up to 256 bits in are presented.
We report on a hybrid DWDM-TDM A optical access network that provides route for integrating and metro net- works into single all-optical system. The greatest challenge in using DWDM networks is to precisely align the wavelength of customer transmitter (Tx) with wave- length grid at low cost. Here, this was achieved novel tunable, external cavity lasers units (ONUs) customer's end. To further support upstream link, 10 Gb/s burst mode receiver (BMRx) developed gain-stabilized erbium-doped...
A fully-packaged hybrid-integrated all-optical flip-flop, where InP-based semiconductor optical amplifiers are assembled onto a planar silica waveguide board, is demonstrated. It shown experimentally that the flip-flop can dynamically toggle between its two states by injecting 150 ps pulses with 6 dBm peak power via set and reset port.
Abstract The authors demonstrate the use of highly temperature insensitive dense wavelength division multiplexing filters combined with optical reflectors and time domain reflectometry to uniquely identify specific fibres beyond splitter in an access passive network (PON). very low shift (∼0.1 pm/°C) over full industrial range facilitates future field deployment these components PON without requirement for complex expensive tracking at line terminal.
The authors experimentally demonstrate an all-optical circulating shift register in which the nonlinear element is a semiconductor optical amplifier. This device shows potential for low latency, high speed, power processing.
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> This paper presents an experimental performance characterization of all-optical subsystems at 40 Gb/s using interconnected hybrid integrated semiconductor optical amplifier (SOA) Mach–Zehnder interferometer (MZI) gates and flip-flop prototypes. It was shown that can be treated as generic switching elements and, when efficiently interconnected, form larger more functional network subsystems....
A novel architecture to enable future network security systems provide effective protection in the context of continued traffic growth and need minimize energy consumption is proposed. It makes use an all-optical prefiltering stage operating at line rate under software control distribute incoming packets specialized electronic processors. An experimental system that integrates controls interfaces with pattern recognition has demonstrated key functions required by new architecture. As...
We experimentally demonstrate an all-optical binary counter composed of four semiconductor optical amplifier based switching gates. The time-of-flight circuit operates with bit-differential delays between the exclusive-OR gate used for modulo-2 addition and AND carry detection. A movie operating in real time is presented.
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.