Fujitsu Optical Components Limited

Fujitsu Corporation

Masayuki Kurisu

Shuichi Yasuda

Eiji Ishioka

Takeyasu Tomioka

Kazutaka Satoh

Shinya Kimura

Makoto Shinohara

Masahiko Fuse

Masaya Ishida

Toshifumi Aso

Makoto Funaoka

An optical receiver includes a processor. The processor calculates first through fourth optical intensities that respectively indicate input optical intensities of in-phase component in the first polarization, quadrature component in the first polarization, in-phase component in the second polarization and quadrature component in the second polarization. The processor calculates polarization dependent intensity ratio and phase dependent intensity ratio based on the first through fourth optical intensities. The processor calculates an input optical intensity of a polarization multiplexed optical signal based on an optical intensity of one of the first through fourth amplifiers, the polarization dependent intensity ratio, and the phase dependent intensity ratio.

Optical receiver that receives polarization multiplexed optical signal

A coherent optical receiver includes: an attenuator that adjusts a power of an input optical signal; a mixer that mixes an optical signal output from the attenuator and local oscillator light; a photo detector that converts an optical signal output from the mixer into an electric signal; an amplifier that amplifies an output signal of the photo detector; a gain controller that controls a gain of the amplifier; a memory that stores dependence information that indicates a relation between an input optical power of an optical signal of a specified wavelength and a gain of the amplifier; and a controller that calculates an input optical power of the target wavelength based on a gain of the amplifier and the dependence information, and controls an attenuation amount of the attenuator based on the calculated input optical power, when a WDM optical signal is input into the coherent optical receiver.

Coherent optical receiver

A communication terminal having a wireless communication facility including sending and receiving a message which is sent to a receiving terminal without a send request from a receiving terminal through a message center, including: a message sending/receiving unit sending and receiving the message; a time control unit controlling current time; a message analysis unit analyzing a message which is sent by a message center, received by the message sending/receiving unit, and includes time information assigned by a message center, and retrieving the time information; and a time setting unit setting in the time control unit a time indicated by the time information retrieved by the message analysis unit as a current time.

Communication terminal, message center, time control program storage medium, and remote time setting program storage medium

Growing community of inventors

Sapporo, Japan

Masayuki Kurisu