Pass-monitoring apparatus of optical network system

Details Pass-monitoring apparatus of optical network system Pass-monitoring apparatus of optical network system

1997-09-25

2000-08-08

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359117, 359128, H04B 1008

Patent

active

061010103

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.

REFERENCES:
patent: 5317439 (1994-05-01), Fatehi et al.
patent: 5657154 (1997-08-01), Yoneyama
patent: 5754320 (1998-05-01), Watanabe et al.
patent: 5757526 (1998-05-01), Shiragaki et al.
patent: 5867289 (1999-02-01), Gerstel et al.
patent: 5914798 (1999-06-01), Liu

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