A5048230612- Optical Network Technologies
- Advanced Photonic Communication Systems
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- IoT and Edge/Fog Computing
- Image Enhancement Techniques
- Optical Wireless Communication Technologies
Optica
2023
University College London
2019-2022
Northumbria University
2018
In this paper, we propose a geometric shaping (GS) strategy to design 8, 16, 32 and 64-ary modulation formats for the optical fibre channel impaired by both additive white Gaussian (AWGN) phase noise. The constellations were optimised maximise generalised mutual information (GMI) using mismatched model. presented demonstrate an enhanced signal-to-noise ratio (SNR) tolerance in high noise regimes when compared with their quadrature amplitude (QAM) or AWGN-optimised counterparts. By putting...
Fast (nanoseconds) optical wavelength switching is emerging as a viable solution to scaling the size and capacity of intra-data center interconnection. A key enabling technology for such systems low-jitter clock synchronization, which enables sub-nanosecond data recovery optically switched frames using low-cost methods phase caching. We propose demonstrate real-time low-latency wavelength-switched clock-synchronized interconnection at 51.2 GBd fast tunable laser (with ns scale time)...
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.
A frequency-domain multiple-input multiple-output (FD-MIMO) equalizer employing a momentum-based gradient descent update algorithm is proposed for polarization multiplexing coherent receivers. Its performance in operation with dynamically varying optical channels investigated and the impact of filter delays, arising from latency fast Fourier transforms (FFTs) other digital signal processing (DSP) operations feedback loop, assessed. We show that used to control response has significantly...
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...
Carrier phase estimation (CPE) is one of the key requirements to perform intradyne coherent detection in optical communication systems. Residual errors at receiver, also known as residual noise (RPN), follow so-called Tikhonov distribution. In digital domain, a channel where has already been estimated by CPE generally partially-coherent additive white Gaussian (PCAWGN) channel. Herein, we present joint strategy modulate and demodulate 2-dimensional (2D) signal PCAWGN Using low-complexity...
Geometrically shaped constellations, designed for improved AWGN channel performance, are combined with enhanced symbol decision metrics low rate/high linewidth applications, e.g., ultra-dense wavelength division multiplexed passive optical networks (UDWDM-PON). The metric enables 32-ary constellation transmission robustness to and phase noise.
We leverage the low thermal sensitivity and dispersion features of hollow antiresonant fiber to demonstrate a real-time low-latency optically-switched intra-data center interconnect at 51.2 GBd by co-designing fast wavelength switching optical clock synchronization.
The asynchronous nature of smartphone-to-smartphone (S2S) based on visible light communication (VLC) imposes a significant challenge the speed camera-based receiver processing time and algorithm. Recent improvements smartphone camera hardware current release highly customised camera2 application programming interface (Camera2-API) have increased smartphone's computational capability. This paper presents comparative study acceleration frameworks, which can be used for image Android device to...
We improve an inverse regular perturbation (RP) model using a machine learning (ML) technique. The proposed learned RP (LRP) jointly optimizes step-size, gain and phase rotation for individual branches. demonstrate that the LRP can outperform corresponding digital back-propagation (DBP) method based on split-step Fourier (SSFM), with up to 0.75 dB in 800 km standard single mode fiber link. Our also allows fractional step-per-span (SPS) modeling reduce complexity while maintaining superior...