RECEPTION APPARATUS

摘要

An optical-electrical (OE) conversion unit (11) converts optical signals received through an optical transmission line into first electrical signals and second electrical signals. A multilevel identification unit (12) identifies the first electrical signals based on a plurality of identification levels, and produces multinary identification signals. A serial-parallel conversion circuit (13) converts the multinary identification signals into multinary parallel signals. An optical reception quality circuit (14) produces reliability information that indicates quality of optical signals from the second electrical signals. An error-correction decoding circuit (15) corrects errors based on the multinary parallel signals and the reliability information, and outputs error-corrected parallel signals.