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We demonstrate that DCTs-OFDM has the similar BER performance with traditional OFDM in VLC, while effectively improves the transmission distance by 20% due to less PAPR and SNR-BER performance about 1dB in multipath interference environment.
We describe recent advances in wideband photonic signal processors including single-passband programmable microwave photonic filters, ultra-wideband phase shifters, multiple frequency microwave photonic measurement systems, and photonic RF memory structures, which provide new capabilities for the realisation of high-performance signal processing.
Optical phase conjugation has shown interesting prospects for nonlinear compensation in transmission systems. Here we review the concept and recent progress of a system designed to maximize its benefits, leading to linearized WDM transmission systems.
Tunable all-optical fine control of pulse width via doublet Brillouin gain lines was demonstrated in a short 204-m-long nonlinear single-mode tellurite fiber. Gaussian pulse shaping with a compression ratio ranging from 1.17–0.27 was achieved after the input square pulse was amplified by the modulated Brillouin gain in this tellurite fiber.
The possibility to directly realize all-optical delay lines in optical fibers has triggered efforts of research during the past decade, with few practical outcomes. The reason is fundamental, caused by the unescapable relation between delay and distortion.
We consider the visible light communication in extremely weak illumination environment. The system consists of an LED transmitter and a photomultiplier tube (PMT) receiver. We also show the bit-error rate (BER) of the signal detection.
The mathematical description and numerical simulation analysis of the single multimode fiber imaging system are presented. Through numerical simulations, the wave propagation from source to image plane is calculated and the image restoration algorithm is proved.
We report 22.4Gbps photonic wireless transmission at a low optical received power level in 1km optical fiber. In the 1m wireless transmission demonstration (6Gbaud, 16QAM), a new high-sensitivity photoreceiver and a new calibration software technique have been developed.
We discuss recent progress on the use of optical and digital phase conjugation techniques for nonlinearity compensation in optical fiber links. We compare the achievable performance gain of phase conjugated twin wave applied in two polarization states and time segments with mid-link optical phase conjugation and digital back propagation. For multicarrier transmission scheme such as orthogonal frequency...
This paper presents an adaptive noise cancellation method for time-interleaved photonic analog-to-digital converters (TIPADC), where a part of the optical sampling clock signal is divided to back-end processing module to eliminate the amplitude noises in the optical sampling clock induced by laser sources and the pulse repetition rate multiplication like OTDM. The principle of the proposed method...
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