Patent Number: 6,490,387

Title: Optical transmission device and optical transmission system employing the same

Abstract: An optical transmission device which reduces optical noise in an optical transmission system. The optical transmission device includes a core light amplifying unit, and a first buffer light amplifying unit for amplifying a first signal light from a first transmission path and an amplified second signal light from the core light amplifying unit. The first buffer light amplifying unit supplies the core light amplifying unit with the first signal light, and supplies the first transmission path with the amplified second signal light. Also provided is a second buffer light amplifying unit for amplifying a second signal light from a second transmission path and an amplified first signal light from the core light amplifying unit. The second buffer light amplifying unit supplies the core light amplifying unit with the second signal light, and supplies the second transmission path with the amplified first signal light.

Inventors: Kosaka; Junya (Fujisawa, JP), Suzuki; Takayuki (Yokohama, JP), Nakano; Hiroyuki (Yokohama, JP)

Assignee: Hitachi, Ltd.

International Classification: H04B 10/17 (20060101); G02B 006/28 (); G02B 006/255 (); H01S 003/30 ()

Expiration Date: 12/03/2019