Poster Session Abstracts
Random Forests for Equalizers for Coherent Optical Transmission lines Egor Sedov, PhD student, Aston University
Quantum Random Number Generator Based on On-Off- Keying Encoding Hamid Tebyanian, Department of
Mathematics, University of York, Heslington This paper presents a semi-device independent protocol for quantum randomness generation constructed on the prepare-and-measure scenario based on the on-off-keying encoding scheme and homodyne and heterodyne detection schemes.
Machine learning techniques are rapidly increasing their influence in the telecommunications sector due to their ability to effectively mitigate transmission impairments. In our study, we demonstrate the possibilities of using Random Forest to reduce the nonlinear distortion of a
signal after processing at the receiver. Random Forest is successfully used in classification and nonlinear regression problems where standard methods do not provide the required accuracy. The ability to increase the number of Decision Trees helps to reduce overfitting and increase the final accuracy of the algorithms. Moreover, the addition of new Trees can be used to adapt to changing system parameters and reduce the computational costs of transfer learning.
The security estimation is based on lower bounding the guessing probability for a general case and is numerically optimized by utilizing semi-definite programming. Additionally, we introduce a straightforward optical setup which can be implemented via commercial off-the-shelf components.
Optical Atomic Clocks for Time Dissemination in Telecom Networks
Micro-LED Projector Based 100-Mb/s PAM4 Optical Camera Communications Yingjie Shao, Researcher, Centre for Applied
Lakshmi Rajagopal, Early Stage Researcher, Optical Networks Research, Applied Research, BT Group According to the growing end user demands, time and frequency need to be distributed more precisely across the networks. The growing demand on stringent timing requirements make us think of
Photonics, Fraunhofer UK Research Ltd In recent years, optical cameras have increased significantly in volume worldwide, not only on consumer mobile devices but also in industrial applications and smart infrastructure. By employing LEDs or display screens as transmitters, optical
the next best solution that is better than existing. This can either be with respect to new technologies for precise time source or new technologies to transport time precisely across the networks. The aim of the model is to understand how time can be disseminated across a network. Conventional architecture and protocols used to deliver time and frequency is reaching its limits, as demands from the evolving networks raise to below sub-nanosecond levels. Proliferation of devices across the network is a challenge to distribute time through satellite technologies. The model helps to understand how time can be distributed across the network from highly precise optical atomic clocks. Applications requiring precise time emerge every day. A hierarchical topology of the network is implemented in the model, which gives an impression of the core and tier nodes that exists within a real timing network architecture. The model is built upon a UK national level network, giving an idea on how good the optical atomic clocks can be for time dissemination at the national level. With the model, it becomes easy to understand the flexibility of the architecture with time error requirements. Evaluating the impact of different types of asymmetries on time transfer, lifts the model to fit best with a practical scenario.
camera communication (OCC) can be easily established using existing hardware for various scenarios such as indoor positioning and vehicle-to- infrastructure communications. We present an OCC system based on a 128×128 array CMOS-driven micro-LED projector with 4-level pulse amplitude modulation. Using a high-speed global shutter camera, a 100-Mb/s OCC system is achieved to support high-speed applications. The demonstration also indicates the ability to utilize the grayscale brightness control capability of the micro-LED projector chip and predicts in excess of 1-Gb/s potential data rate OCC system at full resolution of the chip. Moreover, practical considerations are addressed. Over 10-Mb/s demonstrations using the smartphone camera and behind-the-pattern communication link are achieved.
Practical Laser Stabilization Outside The Lab – Two Photon Systems Qiushuo Sun, Research Manager, BT Group PLC
Locking and stabilizing laser sources to absolute atomic references is essential to support cold atom and neutral ion-based technology applications (quantum radio, quantum gravitometers, quantum sensors). Whilst frequency combs and high finesse
cavities offer excellent laser stabilisation in a lab setting it remains challenging to imagine such tools making their way into mainstream fibre networked applications, due to both prohibitive costs and the limitations of stimulated Brillouin scattering. Ground state atomic transitions are generally well addressed with off-the-shelf saturation absorption spectroscopy systems. However, this limits the lockable optical frequencies (based on available atomic vapours). We present 3 methods for two-photon optical laser locking to an excited transition using a narrow electromagnetically induced transparency (EIT). We implement AC Zeeman saturation EIT locking, Dichroic atomic vapour spectroscopy EIT locking, and electro-optical modulator (EOM) sideband-locking to implement scalable laser locking systems which could be embedded within mass market network technology.
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