Fujitsu Corporation

Hiromu Yoshii

Akira Yamamoto

Yuichiro Sakane

Yasushi Sugaya

Tomoyuki Sakata

Yoshiyuki Maeda

Masahiro Oohashi

Taku Yoshida

Kazuyuki Inomoto

Hironori Kadota

Yumiko Ogata

Kouichi Maeda

Tsutomu Tsurumi

Seiji Miyata

Ryuta Hoshi

Yoko Toyozumi

Yoshiko Sakamoto

An optical transmitter and receiver has stored in advance therein FEC techniques and applicable conditions for applying the FEC techniques to a counterpart optical transmitter and receiver. The optical transmitter and receiver measures a state of receiving data transmitted from the counterpart optical transmitter and receiver, determines an applicable condition satisfying the measured data reception state from among the stored applicable conditions, and selects a FEC technique stored in association with the applicable condition determined as satisfying. The optical transmitter and receiver then notifies the counterpart optical transmitter and receiver of the selected FEC technique.

Optical transmitter and receiver and optical transmission and reception system

An aspect of the embodiments utilizes an optical transmission apparatus which includes a rough adjustment execution portion that monitors a bit error rate of an optical signal for set values of a dispersion compensator where the set values have been set less closely to each other within a dispersion compensation control range than when a wavelength dispersion value set in the dispersion compensator is determined, and carries out a rough adjustment to determine a comparison threshold value used to set the wavelength dispersion value based on the monitored bit error rate, and a fine adjustment execution portion that monitors the bit error rate for the dispersion compensator the set values have been set more closely to each other, and carries out an adjustment to determine a wavelength dispersion value corresponding to the midpoint between the two acquired bit error rates as the wavelength dispersion value of the dispersion compensator.

Optical transmission apparatus, optical transmission method, and optical transceiver

A communication processing apparatus appends group information representing a group to received communication frames. Group information to be appended to the communication frames is changed on a predetermined cycle. The communication frames processed in each processing unit are counted separately for each of the group information appended, and the count value is collected in each processing unit. With a communication processing apparatus, such as a switch and a router, which has a plurality of processing units (device), performs processing by each of the processing units on the communication frames received from a receiving unit, and transmits the processed communication frames from a transmitting unit, it is possible to realize a communication processing apparatus and a totalizing system capable of accurately counting and collecting the communication frames while performing an operation when totalizing the number of communication frames processed in each of the processing units.

Communication processing apparatus and totalizing system

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Fukuoka, Japan

Hiromu Yoshii