Optical communications – Diagnostic testing – Fault location
Reexamination Certificate
2005-11-01
2009-06-02
Curs, Nathan M (Department: 2613)
Optical communications
Diagnostic testing
Fault location
C398S013000, C398S021000
Reexamination Certificate
active
07542673
ABSTRACT:
A fault localization apparatus for an optical line in a wavelength division multiplexed passive optical network is disclosed. The apparatus can detect light loss and fault positions as a channel exhibiting an abnormal receiving state of signals received by each of the upstream receivers is checked, and a monitoring optical signal is used, in which the monitoring optical signal is generated as a pulse is inputted to a light source of the downstream transmitter corresponding to the channel showing such an abnormal receiving state. The apparatus according to the present invention can detect fault positions of optical lines between the central office and the remote nodes and between the remote nodes and the optical network units, since the light source of downstream channel in which faults occur is used as a monitoring light source. The apparatus according to the present invention can be cost-effectively implemented.
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Kuniaki Tanaka et al., “In-service Individual Line Monitoring and a Method for Compensating for the Temperature-dependent Channel Drift of a WDM-PON Containing an AWGR Using a 1.6 μm Turntable OTDR”, ECOC 97, Sep. 22-25, 1997, Conference Publication No. 448, © IEE, 1997, pp. 295-298.
Chung Yun Chur
Han Kwan Hee
Lim Kyung Woo
Son Eui Seung
Curs Nathan M
Korea Advanced Institute of Science and Technology
Oliff & Berridg,e PLC
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