Optics: measuring and testing – For optical fiber or waveguide inspection
Reexamination Certificate
2005-08-16
2005-08-16
Nguyen, Tu T. (Department: 2877)
Optics: measuring and testing
For optical fiber or waveguide inspection
Reexamination Certificate
active
06930768
ABSTRACT:
A system and technique for determining discontinuities over a span of a multimode optical fiber (MMF). An optical time domain reflectometer (OTDR) has an operating port, and a first end face of a singlemode optical fiber (SMF) is coupled to the operating port. Light pulses produced by the OTDR emerge from a second end face of the SMF, and an alignment stage aligns the second end face with an end face of a multimode optical fiber (MMF) having a core of given radius. The light pulses from the second end face of the SMF are applied at selected radial positions on the MMF core to excite corresponding mode groups in the MMF. Backscatter light produced by each excited mode group is coupled to the OTDR through the SMF. Locations and values of events detected along the MMF are indicated on the OTDR for each selected radial position.
REFERENCES:
patent: 4286979 (1981-09-01), Buckler et al.
patent: 4319902 (1982-03-01), Hensel
patent: 6400450 (2002-06-01), Golowich et al.
patent: 6421117 (2002-07-01), Akikuni
patent: 2002/0101577 (2002-08-01), Thwing et al.
abcTeletraining, Inc., Fiber Optic Cable—A Lightguide (1991), pp. 156-163.
A.H. Cherin, An Introduction to Optical Fibers, Bell Laboratories (1983), pp. 199-201.
Agilent Technologies GmbH, Optical Time Domain Reflectometers—Pocket Guide (2001), pp. 13-21.
Optronics, Tutorials—OTDRs (2003), www.optronics.gr.
Oman Fiber Optic Co., Technical Application Note—A Guide to OTDR Trace Analysis (Nov. 2001), www.omanfiber.com.
Ingles, Jr. Andrew L.
Liu Alice
Reed William A.
Wang Peng
Yang Ming
Furukawa Electric North America
Law Office of Leo Zucker
Nguyen Tu T.
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