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Coherent Detection (coherent + detection)

Distribution by Scientific Domains

Engineering	60%

Selected Abstracts

Coherent detection for spectral amplitude-coded optical label switching systems

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2010
Alexey V. Osadchiy
Abstract Coherent detection for spectrally encoded optical labels is proposed and experimentally demonstrated for three label tones spectrally spaced at 1 GHz. The proposed method utilizes a frequency swept local oscillator in a coherent receiver supported by digital signal processing for improved flexibility and upgradeability while reducing label detection subsystem complexity as compared with the conventional optical autocorrelation based approaches. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2732,2735, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25585 [source]

Effect of noisy carrier reference signal and interference on performance of MSK receiver

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 2 2004
Mihajlo C. Stefanovic
Abstract This paper considers the coherent detection of minimum shift keying signal and a degradation in error rate performance from ideal due to an interference and a phase discrepancy between the carrier of the received signal and the carrier of the receiver. The error rate is calculated for the simple receiver model with integrate-and-dump circuits. The reference carrier signal unsteadiness is presented by the probability density function of the first order non-linear PLL phase error, while the uncertainty due to an interference is involved in the system model with a random phase of cosine signal that accompanied the useful signal. Copyright © 2004 John Wiley & Sons, Ltd. [source]

8 Tb/s long haul transmission over low dispersion fibers using 100 Gb/s PDM-QPSK channels paired with coherent detection

BELL LABS TECHNICAL JOURNAL, Issue 4 2010
Jérémie Renaudier
100Gb/s end-to-end broadband optical solutions are attractive to cope with the increasing demand for capacity. Polarization-division-multiplexed (PDM) quaternary-phase-shift-keying (QPSK) paired with coherent detection has been found to be promising for upgrading optical legacy systems based on 50GHz wavelength slots thanks to its high spectral efficiency (2bit/s/Hz) and its tolerance to linear effects. One of the major concerns for the deployment of such a solution is the transmission reach, mainly limited by nonlinear effects. This limitation can be exacerbated over non-zero dispersion shifted fiber (NZDSF) due to low local chromatic dispersion of the transmission fiber. The aim of this paper is first to report on the benefits brought by combining coherent detection techniques with advanced modulation formats as compared to conventional direct detection schemes for optical fiber communications. Digital signal processing paired with coherent detection is described to point out the efficiency of a coherent receiver to combat noise and to mitigate linear impairments. We then report on nonlinear tolerance of 100 Gb/s coherent PDM-QPSK through an 8 Tb/s transmission over a dispersion-managed link based on low dispersion fibers. © 2010 Alcatel-Lucent. [source]