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We present a comparison of homodyne and intradyne detection schemes for high-order modulation formats in optical inter-satellite communication systems. The homodyne detection based on optical PLL techniques is numerically investigated for BPSK and QPSK transmission. We compare this scheme with intradyne detection based on digital frequency offset and phase noise compensation as an approach for future...
In this paper, we review our recent progress in optical wireless communication systems incorporating infra-red free-space link for in-building personal area networks. We have previously demonstrated a high-speed infrared optical wireless system incorporating localization function that enables limited mobility. Our system is based on light-of-sight transmission but with slightly diffused beam to relax...
This paper outlines part of the work in the TEROPON project to evaluate the feasibility of developing novel high-speed software-reconfigurable optical transceivers based on Optical Orthogonal Frequency Division Multiplexing (OOFDM) and Digital Filter Multiple Access (DFMA) technologies for Next Generation PONs in the Access Network. It examines the key product requirements, describes some of the experimental...
We propose a non-Hermitian symmetry orthogonal frequency division multiplexing (NHS-OFDM) scheme for indoor space division multiplexing based visible light communication (SDM-VLC) systems. NHS-OFDM removes the constraint of Hermitian symmetry and generates light-emitting diode (LED) compatible real-valued signals by parallelly transmitting the real (Re) part and the imaginary (Im) part of a complex-valued...
This article presents new insights in the research of VLC communication transmitter based on multimode optical fibres. Optical transmitters are formed by a different number of optical fibres. These fibres illuminate the defined surface area in the form of the 1/8 of the sphere, which simulates the room corner. The aim of this article is to point to possible new trends in the field of research such...
In this paper we investigate optical properties of 1×16 splitters based on Y-branch and MMI approaches. These splitters were designed, simulated and the obtained results of both approaches were studies and compared with each other. Additionally, we will show that the used standard waveguide core size (usually 6 × 6 µm2 to match the diameter of the single mode input/output fibers, i.e. to keep the...
We demonstrate recent advances in the area of optical RAM-based cache memory technology and in the area of optical interconnect technologies for allowing the deployment of a disintegrated computational setting where off-chip optical cache modules can be connected to cache-light Chip Multiprocessors and DRAM modules. We report on recent experimental results obtained within the FP7 project RAMPLAS and...
Circuit-based optical networks have the potential to provide end-to-end dedicated channels with flexible data rates between edge node pairs. However, the data-rate granularity of spectral-slicing in the optical domain based on wavelength-selective switch (WSS) is limited by the optical filter frequency selectivity. Digital subcarrier multiplexing (DSCM) in the electrical domain is able to provide...
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