241 research outputs found
Photonic Physical Unclonable Functions: From the Concept to Fully Functional Device Operating in the Field
The scope of this paper is to demonstrate a fully working and compact
photonic Physical Unclonable Function (PUF) device capable of operating in real
life scenarios as an authentication mechanism and random number generator. For
this purpose, an extensive experimental investigation of a Polymer Optical
Fiber (POF) and a diffuser as PUF tokens is performed and the most significant
properties are evaluated using the proper mathematical tools. Two different
software algorithms, the Random Binary Method (RBM) and Singular Value
Decomposition (SVD), were tested for optimized key extraction and error
correction codes have been incorporated for enhancing key reproducibility. By
taking into consideration the limitations and overall performance derived by
the experimental evaluation of the system, the designing details towards the
implementation of a miniaturized, energy efficient and low-cost device are
extensively discussed. The performance of the final device is thoroughly
evaluated, demonstrating a long-term stability of 1 week, an operating
temperature range of 50C, an exponentially large pool of unique
Challenge-Response Pairs (CRPs), recovery after power failure and capability of
generating NIST compliant true random numbers
Amplitude Regeneration of Phase Encoded Signals using Injection Locking in Semiconductor Lasers
A phase preserving limiter based on injection locking in semiconductor lasers is experimentally investigated for 10Gb/s phase encoded signals. The proposed scheme exhibits significant amplitude noise squeezing in conjunction with extreme simplicity
Scaling multimode fibre IM/DD transmission capacity through spatial-spectral multiplexing
Data centre connections can greatly benefit from parallel transmission channels on one multimode fibre (MMF). Shortwave wavelength division multiplexing (SWDM) achieves parallel transmission through spectral multiplexing. Furthermore, MMFs offer a spatial dimension that should be exploited to increase parallel transmission, albeit in a cost-effective way. In this paper, it is shown that SWDM and spatial multiplexing can be combined in intensity modulation and direct detection MMF transmission systems that use selective offset excitation and mode-selective spatial filtering
Relayed-QKD and switched-QKD networks performance comparison considering physical layer QKD limitations
We experimentally evaluate the SKR generation for unoptimized QKD pairs in
switched QKD and compare the performance of the switched-QKD with relayed-QKD
networks to reveal they perform better for short distances and at large
networks.Comment: 3 page
Phase-encoded signal regeneration exploiting phase sensitive amplification
We discuss recent advances in phase-sensitive amplification technology and review its application to the regeneration of multi-level phase-encoded signals
O-band QKD link over a multiple ONT loaded carrier-grade GPON for FTTH applications
We have successfully integrated an O-band commercial Quantum-Key-Distribution
(QKD) system over a lit GPON testbed that replicates a carrier-grade
Fiber-to-the-Home (FTTH) optical access network with multiple ONTs to emulate
real-life FTTH operational deployments.Comment: 3 page
Field demonstration of a fully managed, L1 encrypted 3-node network with hybrid relayed-QKD and centralized symmetric classical key management
We successfully demonstrated a fully-managed, field-deployed, three-node QKD
ring network with L1-OTNsec encryption, that employs a hybrid scheme of QKD and
classical yet quantum-safe centrally-generated symmetric keys to support
point-to-point and relay consumers
Phase synchronization scheme for a practical phase sensitive amplifier of ASK-NRZ signals
We present a phase locking scheme that enables the demonstration of a practical dual pump degenerate phase sensitive amplifier for 10 Gbit/s non-return to zero amplitude shift keying signals. The scheme makes use of cascaded Mach Zehnder modulators for creating the pump frequencies as well as of injection locking for extracting the signal carrier and synchronizing the local lasers. An in depth optimization study has been performed, based on measured error rate performance, and the main degradation factors have been identified
All-optical phase regeneration of 40Gbit/s DPSK signals in a black-box phase sensitive amplifier
We present a black-box four wave mixing based bit-rate-flexible phase sensitive amplifier and use it in the first demonstration of 40 Gbit/s DPSK phase regeneration
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