Abstract
Recent advances in optical amplifier technology, especially those based on rare-earth-doped fibre, have led to significant improvements in transmission system performance. Accurate assessment of bit-error-ratio (BER) becomes especially important with the more complex noise sources associated with optically-preamplified receivers. Although the Gaussian noise model offers straightforward usage, it is known to be a poor indicator of decision threshold [1] compared with more accurate techniques [e.g.2]. We present a novel approach based on Edgeworth series expansion. This technique has much reduced analysis time compared to the Gram-Charlier method for similar accuracy. Dark current and thermal noise effects may be included to provide a complete model of receiver performance.
© 1992 Optical Society of America
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