Low-Complexity Soft-Decision Viterbi Algorithm for IM/DD 56-Gb/s PAM-4 System

Hae Young Rha,Sang-Rok Moon,Hun-Sik Kang, Seung-Woo Lee,In-Ki Hwang,Joon Ki Lee

IEEE Photonics Technology Letters（2019）

Cited 5|Views6

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Abstract

In this letter, a soft-decision Viterbi algorithm (SOVA) combined with low-density parity check is investigated to achieve high chromatic dispersion tolerance and alleviate the high optical signal-to-noise ratio (OSNR) requirement in pulse amplitude modulation 4-level (PAM-4) systems. To reduce the complexity increase over a maximum likelihood sequence equalizer, we propose a non-binary SOVA algor...

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Key words

Reliability,Indexes,Parity check codes,Measurement,Complexity theory,Signal to noise ratio,Maximum likelihood estimation

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