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Viterbi equalizer with analytically calculated branch metrics for optical ASK and DBPSK

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2 Author(s)
Freckmann, T. ; Inst. of Telecommun., Univ. of Stuttgart, Germany ; Speidel, J.

We analytically derive probability density functions of the sampled electrically filtered photo current for optical amplitude-shift keying and differential binary phase-shift keying using the Karhunen-Loe`ve series expansion method. This allows us to determine exact branch metrics for a Viterbi equalizer. We then compare the performance of histogram-based Viterbi equalizers with those using analytically calculated branch metrics.

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 1 )