Results 21 to 30 of about 83,637 (301)

Optimized Silicon QPSK Modulator With 64-Gb/s Modulation Speed

IEEE Photonics Journal, 2015
We demonstrate a compact silicon quadrature phase-shift keying (QPSK) modulator consisting of two nested Mach-Zehnder interferometers with a size of 4.5-mm2. The V11 · L of the modulator is 1.4 V · cm with an insertion loss of 8 dB.
Haike Zhu, Linjie Zhou, Tao Wang, Lei Liu, Chiyan Wong, Yanyang Zhou, Rui Yang, Xinwan Li, Jianping Chen   +8 more
doaj   +1 more source

Communication through coherent control of quantum channels [PDF]

Quantum, 2020
A completely depolarising quantum channel always outputs a fully mixed state and thus cannot transmit any information. In a recent Letter\cite{ebler18}, it was however shown that if a quantum state passes through two such channels in a quantum ...
Alastair A. Abbott, Julian Wechs, Dominic Horsman, Mehdi Mhalla, Cyril Branciard   +4 more
doaj   +1 more source

Homodyne coherent detection of ASK and PSK signals performed by a subcarrier optical phase-locked loop [PDF]

, 2005
Optical transmission systems based on homodyne coherent detection of 2-ASK and pilot carrier 2-PSK signals have been implemented. ASK data has been transmitted at 2.5 Gbps, while 2.5 Gbps and 10 Gbps PSK systems have been tested.
S. Camatel, Ferrero, Valter, CAMATEL S, V. Ferrero, Camatel, S.   +4 more
core   +1 more source

Data-Aided Versus Blind Single-Carrier Coherent Receivers

IEEE Photonics Journal, 2010
Fiber-optic research in signal processing for the first generation of coherent communication systems was dominated by receivers with blind adaptation. Next-generation systems will require a scalable and modular design for higher order modulation formats.
Maxim Kuschnerov, M. Chouayakh, K. Piyawanno, B. Spinnler, E. de Man, P. Kainzmaier, Mohammad S. Alfiad, A. Napoli, Berthold Lankl   +8 more
doaj   +1 more source

Low-Complexity One-Step Digital Back-Propagation for Single Span High-Capacity Coherent Transmissions

IEEE Photonics Journal, 2017
A low-complexity one-step digital back-propagation (DBP) scheme is proposed to mitigate intrachannel and interchannel fiber nonlinearities in high-capacity single span transmissions.
Xingyu Zhou, Qunbi Zhuge, Meng Qiu, Fangyuan Zhang, Mohammed Sowailem, Thang M. Hoang, Meng Xiang, Baojian Wu, Kun Qiu, David V. Plant   +9 more
doaj   +1 more source

Sensitivity Deterioration of Free-Space Optical Coherent/Non-Coherent OOK Modulation Receiver by Ambient Light Noise

Sensors, 2023
In free-space optical (FSO) communication systems, on–off keying (OOK) is a widely used modulation format. Coherent and non-coherent OOK receivers with sensitivities of −54.60 dBm and −51.25 dBm, respectively, were built with a communication rate of 1 ...
Weijie Ren, Jianfeng Sun, Haisheng Cong, Yuxin Jiang   +3 more
doaj   +1 more source

FPGA-Based Rate-Compatible LDPC Codes for the Next Generation of Optical Transmission Systems

IEEE Photonics Journal, 2016
In this paper, we propose a rate-compatible forward error-correcting (FEC) scheme based on low-density-parity check (LDPC) codes together with its software reconfigurable unified field-programmable gate array (FPGA) architecture.
Ding Zou, Ivan B. Djordjevic
doaj   +1 more source

Mitigating the Impact of Noise on Nonlinear Frequency Division Multiplexing

Applied Sciences, 2020
In the past years, nonlinear frequency division multiplexing (NFDM) has been investigated as a potentially revolutionary technique for nonlinear optical fiber communication.
Stella Civelli, Enrico Forestieri, Marco Secondini   +2 more
doaj   +1 more source

Rhythms for Cognition: Communication through Coherence [PDF]

Neuron, 2015
I propose that synchronization affects communication between neuronal groups. Gamma-band (30-90 Hz) synchronization modulates excitation rapidly enough that it escapes the following inhibition and activates postsynaptic neurons effectively. Synchronization also ensures that a presynaptic activation pattern arrives at postsynaptic neurons in a ...
openaire   +5 more sources

Frequency-to-Time-Assisted Interferometry for Full-Field Optical Waveform Measurements With Picosecond Resolution and Microsecond Record Lengths

IEEE Photonics Journal, 2012
This paper describes and demonstrates a single-shot, full-field (amplitude and phase) optical waveform measurement technique that utilizes interferometry, frequency-to-time mapping, and four-quadrature coherent detection.
Ryan P. Scott, Nicolas K. Fontaine, David J. Geisler, S. J. B. Yoo   +3 more
doaj   +1 more source