Optical reception apparatus

Details Optical reception apparatus Optical reception apparatus

2007-07-03

2007-07-03

Corrielus, Jean B. (Department: 2611)

Pulse or digital communications

Receivers

C375S340000, C714S746000, C714S780000

Reexamination Certificate

active

10416550

ABSTRACT:
An optical receiver includes a soft-decision deciding unit (7) for deciding an electric received signal according to a plurality of decision levels to output a multivalued decision signal, a demultiplexing unit (5) for serial-to-parallel converting the multivalued decision signal to output a multivalued parallel signal, a soft-decision error correction decoding unit (8) for correcting the multivalued parallel signal based on reliability information to output an error-corrected parallel received signal and decision results indicating the decision of the electric received signal according to the plurality of decision levels, a probability density distribution estimation unit (9) for estimating probability density distributions based on distributions of the decision results, and a decision level control unit (10) for controlling the plurality of decision levels based on the probability density distributions, thereby improving the transmission quality.

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Puc, Andrej et al., “Concatenated FEC Experiment over 5000 KM Long straight line WDM test bed”, OFC1999, ThQ6-1˜ThQ6-4, (1999).
Akita, Masashi et al., “Third generation FEC employing turbo product code for long-haul DWDM Transmission systems”, OFC2002, WP2, pp. 289-290, (2002).
“Forward error correction for submarine systems”, ITU-T G.975, pp. 1-11, (1996).

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