Diploma Thesis from the year 2002 in the subject Electrotechnology,
grade: 1,0, University of Dortmund (Lehrstuhl fur
Hochfrequenztechnik), 39 entries in the bibliography, language:
English, abstract: Next generation optical communication systems
will be characterized by increasing data rates, high signal powers
and dense wavelength division multiplexing (DWDM). In
future-optical networks channels will be routed through complex,
meshed networks (ASTN, Automatically Switched Transport Networks,
ITU-T Recommendation G.808 0/Y.1304). These networks will be able
to setup transparent optical paths without converting the optical
signals to electrical signals. In all-optical networks the physical
impairments and degradation effects play an important role. There
is a multitude of degradation effects like dispersion, noise,
crosstalk, fiber nonlinearities, polarization dependent loss, etc.
To enable a fast setup and the best choice of one of the available
paths, the signal quality along the whole transmission distance has
to be evaluated very fast. Ideally, only a single figure of merit
(FOM), e.g. the bit error rate (BER), will be computed, which
incorporates all degradation effects. Therefore it is important to
characterize the different physical impairments analytically.
Signal distortions can be measured by an eye opening penalty (EOP)
and degradation effects due to noise by the optical signal-to-noise
ratio (OSNR). The goal is to find and calculate these impairments
from the signal parameters (modulation format, data rate, duty
cycle, channel spacing, etc.) as well as the route parameters
(fiber lengths and parameters, EDFA powers, etc.). Due to the need
of fast routing algorithms, time-consuming numerical methods or a
complete system simulation are not practical. In addition, it is
not possible to linearly accumulate the different degradation
effects. The focus of this work is to find analytical or heuristic
formulas for each degradation effect. These approximation f
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