Optical reception device and optical reception method

An optical signal receiving equipment, comprising:

• an optical-electrical converting means for converting received optical signals into electronic signals;
• a plurality of deciders for identifying the electronic signals converted by the optical-electrical converting means;
• a soft decision-identification means for computing identification signals related to the results of identification by the plurality of deciders, and reliability information indicating a level of reliability of the identification signals;
• an error correction means for correcting error in the identification signals, by using the reliability information computed by the soft decision-identification means;
• and
• a control means for selecting, based on electronic signal identification results made by the plurality of deciders, a decider to be operated among the plurality of deciders in the soft decision-identification means.

An optical signal receiving equipment, comprising:

• an optical-electrical converting means for converting received optical signals into electronic signals;
• a plurality of deciders for identifying the electronic signals converted by the optical-electrical converting means;
• a soft decision-identification means for computing identification signals related to the results of identification by the plurality of deciders, and reliability information indicating a level of reliability of the identification signals;
• an error correction means for correcting error in the identification signals, by using the reliability information computed by the soft decision-identification means;
• and
• a control means for selecting, based on control information inputted from outside, a decider to be operated among the plurality of deciders in the soft decision-identification means.

An optical signal receiving equipment, comprising:

• an optical-electrical converting means for converting received optical signals into electronic signals;
• a plurality of deciders for identifying the electronic signals converted by the optical-electrical converting means;
• a soft decision-identification means for computing identification signals related to the results of identification by the plurality of deciders, and reliability information indicating a level of reliability of the identification signals;
• an error correction means for correcting error in the identification signals, by using the reliability information computed by the soft decision-identification means;
• and
• a control means for executing hard decision-identification of the electronic signals in any one of the plurality of deciders, for measuring, based on the hard decision identification results, the average amplitude of the electronic signals, and for correcting, based on the variation over time in the measured average amplitude, thresholds in the plurality of deciders in the soft decision-identification means.

An optical signal receiving equipment, comprising:

• an optical-electrical converting means for converting received optical signals into electronic signals;
• a plurality of deciders for identifying the electronic signals converted by the optical-electrical converting means;
• a soft decision-identification means for computing identification signals related to the results of identification by the plurality of deciders, and reliability information indicating a level of reliability of the identification signals;
• an error correction means for correcting error in the identification signals, by using the reliability information computed by the soft decision-identification means;
• a hard decision-decider capable of executing hard decision-identification of the electronic signals, independently from the soft decision-identification means;
• and
• a control means for executing the hard decision-identification of the electronic signals by using the hard decision-decider, for measuring, based on the hard decision-identification results, the average amplitude of the electronic signals, and for correcting, based on the variation over time in the measured average amplitude, thresholds in the plurality of deciders in the soft decision-identification means.

An optical signal receiving method, comprising:

• a step of converting received optical signals into electronic signals;
• a step of executing hard decision-identification of the electronic signals converted in the optical-electrical converting step by using a decider;
• and
• a step of measuring, based on the hard decision-identification results, the average amplitude of the electronic signals.