Abstracts
STREAM 8: Quantum Communications Wednesday 15:30 -17:00 Session Chair: Maksym Sich, CEO & Co- founder, Aegiq
Metallic Interconnects for Co-Packaged Photonic Integrated Circuits Andrew Meek, Senko
Fiber and wireless optic communications have played significant roles in increasing the data capacity of modern transmission systems. Laser and channel nonlinear distortions in optical fiber systems and the inter-symbol- interference and the time-varying channel
impulse response in optical wireless communication systems have deteriorated the detection and the demodulation of transmitted symbols from the received signals in corresponding systems. In this talk, we will discuss the performance of advanced signal processing in mitigating the laser phase noise and the fiber nonlinearities under dispersion-unmanaged and dispersion-managed long-haul optical link conditions. We will also present signal detection schemes in ultra-violet optical wireless communication systems by designing optimal linear and high-dimensional combinations of extracted, signal-related geometrical features. Industry Proven Photonic Integration Using Photonic Wire Bonds & Facet Attached Micro-Lenses Dr. Laura Horan, Vanguard Automation GmbH A key technical challenge for photonic packaging challenges is crucial for industrial mass production of hybrid multi-chip modules. Vanguard Automation’s additive 3D nano-printing solution utilizes a unique IP portfolio of photonic wire bonds and facet- attached micro-lenses for optical connectivity. The technique relies on highly precise direct-write 3D laser lithography to print freeform optics between optical modules, realizing fully automated mass production without the need for active alignment. Achieving low-loss optical coupling requires mode field matching of the individual components and precise alignment between devices. Vanguard Automation’s 3D printed freeform structures have shown high reliability and yield for photonic packaging and integration. They are proven to pass strict industry reliability testing and have demonstrated reproducible low- loss coupling while accommodating up to 30µm of alignment offsets. integration and packaging of hybrid multi-chip modules is to realize low-loss, reproducible, and reliable optical connections with fast production cycles. Addressing these integration and
AlGaAsSb-based Single Photon Avalanche Photodiodes for 1550 nm wavelength photons
Jo Shien Ng, Phlux and University of Sheffield Single Photon Avalanche Photodiodes (SPADs) are used for single photon detection around 1550 nm wavelength, in applications such as Quantum Key Distribution and Optical Time Domain Reflectometry. They offer ease of use and high operating temperature, compared to other single photon detectors. Near-infrared SPADs often require moderate
cooling to suppress Dark Count Rate. Since operating voltage of a given SPAD can vary significantly with temperature, having SPADs with excellent temperature stability can simplify complexities around operating SPADs (e.g. SPAD bias circuitry and maintaining SPAD’s temperature). Near-infrared linear-mode AlGaAsSb APDs exhibit excellent temperature stability, significantly better than both InP and InAlAs APDs. Hence, AlGaAsSb-based SPADs offer potential of greatly simplifying operations of near-infrared SPADs. We have carried out an experimental study of In0.53Ga0.47As/Al0.85Ga0.15As0.56Sb0.44 SPADs, obtaining data of Dark Count Rate, Single Photon Detection Efficiency and afterpulsing for multiple devices. They achieved SPDE of 5-15% with DCR of 1-20 Mc/s at 200 K, comparable to InAlAs and early InP-based SPADs. There is potential to improve the performance of AlGaAsSb-based SPADs through improved wafer design and reduced device area, eventually simplifying operating complexity of these SPADs for 1550 nm wavelength photons. Continuous-Variable QKD for Flexible and Efficient Quantum Secure Optical Communications Michela Svaluto Moreolo, CTTC
Continuous variable quantum key distribution (CV-QKD) is a candidate technology to overcome the limitations of classical cryptography and enable quantum secure communications, offering potential cost saving and enhanced compatibility with classical systems. This invited talk will discuss challenges and opportunities
3D Printed Optical Interconnects via 2-Photon Grayscale Lithography for Enhanced Vertical Coupling Jörg Smolenski, Nanoscribe GmbH & Co. KG
of using CV-QKD, as enabler for flexible and efficient quantum secure communications in future optical networks, reporting our recent results obtained in the framework of European and National projects. Specifically, the talk will focus on CV-QKD as an appealing solution to facilitate the coexistence with conventional optical communications, for an efficient and sustainable integration of this technology in the network infrastructure, particularly in the context of open and disaggregated networks and considering the transition towards 6G. Software defined networking (SDN) further facilitates and accelerates a smoother integration within deployed networks, enabling flexibility, programmability and advanced features, such as flexible quantum channel allocation and quantum channel wavelength tuneability. Quantum Networks: from Quantum Key Distribution to Entanglement Distribution Rui Wang, University of Bristol
This talk presents a novel approach to photonic packaging with 3D printed optical interconnects fabricated using two-photon grayscale lithography (2GL). The method enables precisely aligned, low-loss connections, particularly for
vertical coupling, addressing the shoreline density issue expected with the requests for higher numbers of interconnects emerging from various applications. By utilizing a resin with a refractive index (RI) of 1.62, the approach improves the efficiency of vertical optical interconnects. This advanced vertical coupling technique allows minimized signal losses. Furthermore we will demonstrate several samples using Free Space Micro Optics (FSMO) for different optical interconnect scenarios.
The mode division multiplexing (MDM) technology is to open up the new dimension of fibers, enabling significantly increasing the capacity of optical fiber communication systems from the space domain. To implement the MDM technology in the real transmission systems, the great efforts on the low-complex multiple-input multiple-
output (MIMO) equalization have been made to reduce the cost of compensation operation for the high-capacity MDM systems. The hybrid algorithms, e.g., the transfer learning (TF), the genetic algorithm (GA) and the ant-colony optimization (ACO) modified MIMO equalizers have dramatically reduced the training cost, up to 100% compared to the conventional scheme. Moreover, the MDM technology is also considered in the free-space transmission scenario, such as the laser satellite communications. The wide-open channel brings the big challenge on the MDM implementation. The equalization algorithm as the powerful solution has been used to mitigate the impacts from the wireless laser channel, improving the transmission performance in the space satellite networks..
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