Results 251 to 260 of about 1,738,862 (302)

Quantum communication with coherent states

IEEE Transactions on Information Theory, 1989
Quantum communication is studied under the cutoff-rate criterion for transmission of M coherent states of real amplitude (M=2, . . ., 7). Comparison with other measurement operators of interest, such as the number and the quasi-classical operators, is made. The effect of quantization of the decision level on the cutoff rate is considered. >
C. Bendjaballah, Maurice Charbit
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Distributed Coherent Group Communications

MILCOM 2018 - 2018 IEEE Military Communications Conference (MILCOM), 2018
Wireless communication networks need to support high data rate, low power consumption and extended connectivity over long distances, which may not be feasible with point-to-point transmissions. This paper presents the distributed coherent group communication solution to achieve high power gain, which is in turn translated to improvements in ...
Yi Shi 0001, Satya Prakash Ponnaluri, Yalin E. Sagduyu, Eric Van Doorn   +3 more
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Coherent Lightwave Communications

SPIE Proceedings, 1985
In this talk we will present fundamental theoretical considerations affecting the performance of coherent lightwave communication systems. These systems include a single-mode laser and a modulator at the source and a coherent receiver which is the optical onalog of a superheterodyne radio set.
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Coherent Optical Communication Technology

Optical Fiber Communication Conference, 2015
This tutorial lecture discusses fundamentals of the coherent optical communication technology. It covers quantum mechanical understanding of coherent (heterodyne and homodyne) detection, optical circuits for coherent receivers, and digital signal processing for coherent communications.
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Coherent Optical Communication

Asia Optical Fiber Communication and Optoelectronic Exposition and Conference, 2008
Optical coherent receivers with subsequent DSP show great promise as enabling technologies for ultra-high information rate optical transmission systems. DSP alleviates the need to lock the phases of the LO and transmitter signal, which is one of the limiting factors for the use of coherent receivers in the optical domain.
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Scheme of coherent optical chaos communication

Optics Letters, 2020
We propose and numerically demonstrate a scheme of coherent optical chaos communication using semiconductor lasers for secure transmission of optical quadrature amplitude modulation (QAM) signals. In this scheme, a laser intensity chaos and its delayed duplicate are used to amplitude-quadrature modulate a continuous-wave light to generate a chaotic ...
Longsheng Wang, Xiaoxin Mao, Anbang Wang, Yuncai Wang, Zhensen Gao, Songsui Li, Lianshan Yan   +6 more
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Coherent optical communication

International Zurich Seminar on Digital Communications, Electronic Circuits and Systems for Communications., 2002
Activities associated with the development of coherent optical communication systems for application in future public broadband networks are reviewed. It is pointed out that the main future transmission medium, the optical single-mode fiber, provides an extremely high bandwidth which will have to be utilized when high-capacity-demanding digital ...
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Coherent Optical Communication

Seventh Topical Meeting on Integrated and Guided-Wave Optics, 1984
Virtually all fibre transmission systems up to the present have used simple intensity modulation of the transmit laser, most frequently in the form of binary ON/OFF modulation. At the receiver, incoming optical power has been converted directly to photocurrent in a photodetector.
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Communication modes with partially coherent fields

Journal of the Optical Society of America A, 2007
We develop a theory for the description of partially coherent wave fields in linear optical systems in terms of the so-called communication modes. The communication modes are the singular functions and singular values of the appropriate propagation kernels.
Martinsson, Per, Lajunen, Hanna, Friberg, Ari, T.   +3 more
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Coherent Communication Systems

2020
In this chapter, we outline the modern coherent communication formats and how they are realized. These coherent communication formats enable long-distance and high-speed transmission. We also discuss the sources of noise in optical communication systems and the relationship between signal to noise, bit error rate, and communication format.
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