A5068278507- Optical Network Technologies
- Advanced Optical Network Technologies
- Photonic and Optical Devices
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Advanced Memory and Neural Computing
- Quantum optics and atomic interactions
- Interconnection Networks and Systems
- Cloud Computing and Resource Management
- Photonic Crystal and Fiber Optics
- Network Traffic and Congestion Control
- Neural Networks and Reservoir Computing
- Telecommunications and Broadcasting Technologies
- Silicon Nanostructures and Photoluminescence
- Power Line Communications and Noise
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Neuroscience and Neural Engineering
- Transition Metal Oxide Nanomaterials
- Smart Grid Security and Resilience
- Silicon and Solar Cell Technologies
- Optical Coherence Tomography Applications
- Photocathodes and Microchannel Plates
- Advanced Optical Sensing Technologies
Infinera (United States)
2023-2025
University College London
2017-2021
Institute of Electrical and Electronics Engineers
2021
The London College
2019
University of California, Berkeley
2014
The maximum data throughput in a single mode optical fibre is function of both the signal bandwidth and wavelength-dependent signal-to-noise ratio (SNR). In this paper, we investigate use hybrid discrete Raman & rare-earth doped amplifiers to enable wide-band gain, without spectral gaps between amplification bands. We describe widest continuous coherent transmission experimentally demonstrated date 16.83 THz, achieved by simultaneously using S-, C- L-bands. variation parameters over...
We report a study of light-activated resistance switching in silicon oxide (SiOx) resistive random access memory (RRAM) devices. Our devices had an indium tin oxide/SiOx/p-Si Metal/Oxide/Semiconductor structure, with taking place 35 nm thick SiOx layer. The optical activity the was investigated by characterising them range voltage and light conditions. Devices respond to illumination at wavelengths 410–650 but are unresponsive 1152 nm, suggesting that photons absorbed bottom p-type electrode...
We introduce PULSE, a sub-μs optical circuit switched data centre network architecture controlled by distributed hardware schedulers. PULSE is flat that uses parallel passive coupler-based broadcast and select networks. employ novel transceiver architecture, for dynamic wavelength-timeslot selection, to achieve reconfiguration time down O(100 ps), establishing timeslots of O(10 ns). A scheduling algorithm has clock period 2.3 ns performs multiple iterations maximize throughput, wavelength...
We demonstrate a clock and data recovery technique that achieves <625ps locking time for 25.6Gb/s-OOK show its robustness under worst-case centre temperature variation. The was improved by 12×, making nanosecond optical switching viable in centres.
In response to the ever-growing challenge of using conventional direct-modulation/direct-detection transceivers for upgrading passive optical networks, there has recently been a surge in interest alternative transceiver technologies. Candidate systems include (simplified) coherent receivers, and digital signal processing combination with direct detection. Beyond these mainstream solutions, other, more esoteric, system designs have proposed, including networks based on general purpose...
We experimentally investigated a pilot-aided digital signal processing (DSP) chain in combination with high-order geometric constellation shaping to increase the achievable information rates (AIRs) standard intradyne coherent transmission systems. show that AIR of our system at 15 GBd was maximised using geometrically-shaped (GS) 2048 quadrature amplitude modulation (QAM), reaching 18.0 b/4D-symbol back-to-back and 16.9 after through 100 km single-mode fibre subtracting pilot overhead (OH)....
Wavelength routed optical switching promises low power and latency networking for data centres, but requires a wideband wavelength tuneable source (WTS) capable of sub-nanosecond at every node. We propose hybrid WTS that uses time-interleaved lasers, each gated by semiconductor amplifier, where the performance device is optimised using artificial intelligence. Through simulation experiment we demonstrate record switch times below 900 ps across 6.05 THz (122×50 GHz) continuously bandwidth. A...
A linear regression algorithm is applied to a digital-supermode distributed Bragg reflector laser optimise wavelength switching times. The uses the output of digital coherent receiver as feedback update pre-emphasis weights section currents. This permits in-situ calculation without manual weight adjustments. application this optimiser representative subsection channels indicates commercially available can rapidly reconfigure over 6.05 THz, supporting 122 channels, in less than 10 ns.
In this paper, we investigate two categories of linear frequency-modulated chirp signals suitable for single-photodiode based coherent light detection and ranging (LiDAR) systems, namely, the continuous-wave (FMCW) single-sideband (SSB) signal amplitude-modulated double-sideband (DSB) signal, compare their achievable receiver sensitivity performance. The DSB requires a simpler transmitter design, as it is real-valued can be generated using single-drive Mach-Zehnder modulator (MZM), while SSB...
Through C+L band transmission experiments and theoretical modeling, we investigate the impact of channel symbol rate (30, 40, 60, 85 GBd) on performance data center interconnection, metropolitan, core network distances. Two different transponder architectures are investigated: (a) single-carrier receiver (b) multi-carrier receiver, where multiple subcarriers received together in a single wideband receiver. The both receivers experience reduction achievable information as increases due to...
Geometrically shaped (GS) 8-, 16, and 32-ary modulation formats are investigated for use in coherent passive optical networks. The designed to improve receiver sensitivity when paired with a binary, soft-decision forward error correction code (SD-FEC), such as low density parity check (LDPC). Herein we consider the LDPC specified draft 50G EPON standard, show how this type of can be particularly advantageous transmission system. A -26.7 dBm is achieved at post-FEC bit rate below 3.8 × 10...
We propose a time-multiplexed DS-DBR/SOA-gated system to deliver low-power fast tuning across S-/C-/L-bands. Sub-ns switching is demonstrated, supporting 122$\times$50 GHz channels over 6.05 THz using AI techniques.
We demonstrate record real-time 66.8 Tb/s over 301 km unrepeatered fiber transmission based on commercial 100.4 GBaud PCS-64QAM digital subcarrier-based transponders and 9.6 THz multi-band C+L line system employing forward backward Raman amplification.
A split-carrier transmitter is proposed to increase the loss budget for intra-datacentre links by reducing modulator insertion loss. Transmission of 28 GBd subcarrier modulated 16-QAM (112 Gb/s) over 2 km SSMF shown be possible with an optimised <;4.4 dB.
We experimentally demonstrate improved transient control and failure recovery in a 1875 km multi-segment C+L link using fully automated ASE idler management system. Timing improvements of 37% for controlled operations 95% events are reported.
We realize a coherent ONU using only single PIN phododiode, 2-bit ADC, and an EML shared signal/LO-laser. The receiver sensitivity after 20 km transmission is enhanced by 18.6 dB over direct detection PAM-4, but requires no additional optoelectronic hardware.
A split-carrier transmitter is proposed to improve loss budget for short distance 100 G-per-wavelength intra-datacentre links. By applying a low-complexity hardware modification the transmitter, architecture reduces without sacrificing modulation quality. These benefits are demonstrated by implementing intensity modulated, direct-detection signals using single-ended photodiode receiver. The evaluated two formats: Nyquist-shaped 56 GBd PAM-4 and double sideband 28 16-QAM. results compared...
We propose amplitude caching to optically equalise burst mode traffic without delay stages. Through a fast, optically-switched system prototype, we demonstrate burst- penalties can be mitigated within 0.4 dB at the KR4 HD-FEC level.
We present results from a study of resistance switching in silicon-rich silica – ie silicon dioxide containing an excess silicon. demonstrate that changes are the result field-driven movement oxygen, and this can large-scale oxide structure stoichiometry. While oxides has been studied for number years as route to non-volatile electronic memories, optical response such systems remained largely unknown. Here we simple two-terminal MIM devices be switched between different states using...
A transmitter-side carrier tone is applied to suppress SSBI in a 112 Gb/s double sideband IM/DD system using split-carrier transmitter.This novel, low-complexity approach achieves comparable performance computationally-intensive linearised receiver without any additional opto-electronic hardware or linearisation DSP.