Title:
【発明の名称】光ネットワークシステムのパス監視装置
Document Type and Number:
Japanese Patent JP3077600
Kind Code:
B2
Abstract:
It is the object of the invention to detect and locate fails in the optical network by superposing monitoring signals on respective WDM optical signals in the transmitter part of the pass-monitoring apparatus and detecting the monitoring signals on the output side of the matrix switch in an receiver part of the same. The output signals of the matrix switch are respectively splitted by the optical splitters and converted into electrical signals by O/E-converters. The monitoring signals are respectively extracted by variable band-pass filter, center frequencies of which are established by an switching information signal, from the aforementioned electrical signals. The fails of them are respectively detected by an alarm processing circuit, signals are generated for the respective transmission lines. At the same time, the alarm signal is again supplied to the matrix switch and the switching information signal is again generated. The control circuit establishes the center frequencies of the respective variable band-pass filters.
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Inventors:
Chitaka Konishi
Application Number:
JP25451396A
Publication Date:
August 14, 2000
Filing Date:
September 26, 1996
Export Citation:
Assignee:
NEC
International Classes:
H04J14/00; H04B10/07; H04B10/077; H04B10/079; H04B10/25; H04B10/29; H04B10/40; H04B10/50; H04B10/54; H04B10/60; H04J14/02; H04M3/26; H04Q3/52; (IPC1-7): H04Q3/52; H04M3/26
Domestic Patent References:
| JP6232721A |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)