Abstract
In the article, the authors present a new method of numerical determination of Q and BER parameters based on which the quality of transmission in optical fibre transmission systems is determined. The proposed method is based on the use of digital smoothing filters algorithms and does not require the knowledge of the so-called “eye diagram”, which greatly simplifies the entire measurement procedure. This method can be implemented in a simple manner in real-time systems, and in particular it is crucial for ICT systems and networks with a high bit rate of more than 10 Gbps and 40 Gbps and systems with time division or wavelength division multiplexing of 100 GBE and 400 GBE.
Highlights
In every telecommunication system for data transmission, including optical transmission, the problem of signal attenuation or its distortion occurs, resulting from the physical properties of the transmission medium
This factor takes into account the effect of all elements of the optical fibre path and transmission system on its quality, i.e., differentiation in the receiving part of the signal sent by the transmitter, i.e., the possibility of the so-called “eye diagram mask”: hexagonal or rectangular
Taking into account the development of networks and increasing the bit rate in the transmission channel, new transmission solutions [16] and the disadvantages of the “classic” use of the Q index to determine the bit error rate, this paper proposes a new, objective numerical method for estimating the value of the Q parameter with the use of digital smoothing filters
Summary
In every telecommunication system for data transmission, including optical transmission, the problem of signal attenuation or its distortion occurs, resulting from the physical properties of the transmission medium. It can be used to obtain a significant amount of information enabling the determination of the quality of digital signal transmission in an optoelectronic system This diagram is obtained by overlapping all possible bit data combinations, determining the Q parameter and estimating the BER [3], [4], [7]. The BER standard, based on the Q parameter, was developed for transmissions up to 10 Gbps, and currently for transmissions with bit rate above this value, the BER values obtained with this method do not always reflect the real quality of transmission in optical networks (10 Gbps and above).
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