TRANSMISSION/RECEPTION DEVICE, OPTICAL SPACE TRANSMISSION SYSTEM, AND TRANSMISSION/RECEPTION METHOD

摘要

In a digital coherent communication scheme utilizing polarization-multiplexed optical signals, it may be impossible to separate transmission light and reception light from each other with high precision for transmission/reception an optical signal. An optical space transmission system according to the present invention is provided with a first transmission/reception device which radiates first reception light and second reception light whose polarization states are orthogonal to each other, and a second transmission/reception device which radiates third reception light alternately including a first reception light component whose polarization state is the same as the first reception light and a second reception light component whose polarization state is the same as the second reception light in a time-wise manner.

主权项

1. A transmission/reception device comprising:
an antenna unit which is irradiated with reception light alternately including a first reception light component and a second reception light component whose polarization states are orthogonal to each other in a time-wise manner, and which radiates first transmission light having a polarization state orthogonal to the polarization state of the first reception light component, and second transmission light having a polarization state orthogonal to the polarization state of the second reception light component in a predetermined direction into an external space; a first transmitter which generates the first transmission light; a second transmitter which generates the second transmission light; a first polarization multiplexer/demultiplexer circuit which separates the irradiated reception light and the generated first transmission light from each other depending on a polarization state, and outputs the first reception light component and the first transmission light in directions different from each other on one axis; a second polarization multiplexer/demultiplexer circuit which separates the irradiated reception light and the generated second transmission light from each other depending on a polarization state, and outputs the second reception light component and the second transmission light in directions different from each other on one axis; and a receiver which combines the output first reception light component and the output second reception light component for processing.