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Laser Optics & Photonics and Atomic & Plasma Science 2018
J u l y 1 6 - 1 7 , 2 0 1 8
P r a g u e , C z e c h R e p u b l i c
Page 34
American Journal of Computer Science and Information Technology
ISSN: 2349-3917
E u r o S c i C o n J o i n t E v e n t o n
Laser Optics & Photonics and
Atomic & Plasma Science
G Katz et al., Am J Compt Sci Inform Technol 2018, Volume 6
DOI: 10.21767/2349-3917-C1-002
C
hromatic dispersion is a critical factor that limits the quality of the received
optical signal in high speed fiber optic communication systems. Chromatic
dispersion introduces pulse broadening of transmitted signal and occurs due
to the propagation delay variance of different spectral components of the
transmitted signal. In order tominimize the performance degradation caused by
pulse distortion and broadening, dispersion compensation is needed. Electrical
dispersion compensation equalizer is a key and cost-effective element in
optical communication systems in the presence of chromatic dispersion. The
equalizer coefficients can be calculated or estimated adaptively according to
an optimization criterion. There are two common optimization criteria, the zero
forcing and minimum mean square error (MSE), where the latter is found to
be more useful as it considers the noise enhancement. For the MSE criterion
the equalizer coefficients can be estimated adaptively using the least mean
square (LMS) method or analytically calculated using Wiener solution. In most
researches of optical communication systems, the equalizer coefficients were
estimated adaptively by using the LMS method. Here, an analytical solution
is established for the electrical equalizer coefficients in on-off-keying optical
communication systems. The solution is based on minimum MSE. The
analytical results show a perfect match with computer simulation. In addition
BER performance comparison with the adaptive LMS method reveals that the
analytical solution performs better due to LMS excess MSE.
Biography
G Katz received his PhD degree in Electrical and Computer En-
gineering from Ben Gurion University in Israel in 2006. In 2000
he finished his MA on the subject of optical coherent multiplex-
ing CDMA. From 2000-2003, he worked as Electrical Engineer
in the Free Space Optics Field, developing a sophisticated laser
transmitter and optical receiver. In his PhD during 2003- 2006,
he has investigated electrical digital signal processing (DSP)
techniques to mitigate intersymbol interference (ISI) effect in
optical communication systems. This research led to a startup
company in 2006, MultiPhy which today is a leading company
that develops the next generation ICs at 100Gbps and 400Gbps
for fiber optic networks. From 2016, he conducts his research
and functions as a Lecturer at Holon Institute Technology, Isra-
el. He has published more than 20 papers on subjects as DSP
for optical communication systems, DSP for free space optics
and more.
giladka@hit.ac.ilAnalytical commutation of electrical equalizer in on-off-
keying optical communication systems
G Katz and D Sadot
1
Holon Institute of Technology, Israel
2
Ben-Gurion University of the Negev, Israel