Optics: measuring and testing – For optical fiber or waveguide inspection
Reexamination Certificate
2007-12-18
2007-12-18
Nguyen, Tu T. (Department: 2886)
Optics: measuring and testing
For optical fiber or waveguide inspection
Reexamination Certificate
active
11204996
ABSTRACT:
A device and method of optical fiber condition monitoring in optical networks is described. The front end of each branch of the optical network is installed with an optical filter that can filter an optical signal with a different wavelength. Optical signals of different wavelengths enter each of the branches in sequence for analysis, so that the condition of each branch on the optical network can be determined. This solves the problem of interference among the branches when monitoring the optical fiber condition on an optical network.
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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 Tunable OTDR”, ECOC 97, Sep. 22-25, 1997, Conference Publication No. 448.
The Office Action issued by Japan Patent and Trademark Office on Jul. 18, 2007.
Harness & Dickey & Pierce P.L.C.
Industrial Technology Research Institute
Nguyen Tu T.
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