Title:
光分岐挿入多重化装置
Document Type and Number:
Japanese Patent JP4713837
Kind Code:
B2
Abstract:
A problem to be solved in an optical communication system for carrying out bidirectional transmission between communication nodes by wavelength-division-multiplexed optical signals is that a plurality of optical add-drop multiplexers installed in the communication nodes are required for each transmission direction, and therefore, the communication cost is increased. An optical circulator or an optical coupler is arranged at an input/output port of the optical add-drop multiplexer and the wavelength-division-multiplexed optical signals are assembled for each transmission direction, whereby optical signals transmitted bidirectionally can be handled by one optical add-drop multiplexer.
Inventors:
Sasaki Shin ya
Nobuhiko Kikuchi
Kenne Sekine
Nobuhiko Kikuchi
Kenne Sekine
Application Number:
JP2004033151A
Publication Date:
June 29, 2011
Filing Date:
February 10, 2004
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
H04J14/00; H04B10/00; H04B10/27; H04B10/29; H04J14/02
Domestic Patent References:
| JP11218729A | ||||
| JP5235873A | ||||
| JP11218728A | ||||
| JP10178404A | ||||
| JP11218790A | ||||
| JP2001103007A | ||||
| JP2001127705A | ||||
| JP2001177476A | ||||
| JP2002208895A |
Foreign References:
| US20030175029 |
Attorney, Agent or Firm:
Polaire Patent Business Corporation
Katsuo Ogawa
Kyosuke Tanaka
Katsuo Ogawa
Kyosuke Tanaka