Nec Corporation

Ryu Kurahashi

Fatih Yaman

Yoshihisa Inada

Shinsuke Fujisawa

Takanori Inoue

Kohei Nakamura

Ryuji Aida

Eduardo Rodriguez

Yoshinari Takigawa

Hussam Batshon

A branching/coupling device is provided with: first to third optical transmission paths; a first multi/demultiplexer that outputs a first optical signal based on the wavelength-multiplexed optical signals inputted from the second and third optical transmission paths, outputs a second optical signal based on the wavelength-multiplexed optical signals inputted from the first and third optical transmission paths, and outputs a third optical signal based on the wavelength-multiplexed optical signals inputted from the first and second optical transmission paths; a second multi/demultiplexer that outputs one of the first to third optical signals based on the wavelength-multiplexed optical signals; an optical splitter that distributes the wavelength-multiplexed optical signals to the first and second multi/demultiplexer; and an optical switch that selects either the first to third optical signals generated in the first multi/demultiplexer or the second multi/demultiplexer, and outputs the selected optical signals to the output destinations.

Optical branching/coupling device and method for controlling same

In order to make a communicable distance in an optical cable of an optical signal which is subjected to amplitude modulation longer, a re-modulation device is provided with: an acquisition unit that acquires, from a first modulation optical signal obtained by performing first amplitude modulation on an optical signal with second data sent from a modulation transmission device to a demodulation reception device, the second data; and a re-modulation unit that, when determining passing of the first modulation optical signal, sends, to the demodulation reception device, a second modulation optical signal obtained by performing second amplitude modulation on the inputted optical signal with the second data.

Re-modulation device, demodulation reception device, modulation transmission device, modulation communication system, re-modulation method, and recording medium

Aspects of the present disclosure describe a three-way branching unit switch module having a small footprint suitable for application in an undersea application.

Three-way branching unit switch module having small footprint

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Tokyo, Japan

Ryu Kurahashi