Optoelectronic marker for determining ownership of fiber...

Details Optoelectronic marker for determining ownership of fiber... Optoelectronic marker for determining ownership of fiber...

2007-09-20

2008-12-23

Curs, Nathan M (Department: 2613)

Optical communications

Diagnostic testing

Determination of communication parameter

C398S031000, C398S016000

Reexamination Certificate

active

07469101

ABSTRACT:
A passive optical arrangement for indicating the presence of a change in ownership along a fiber optic cable span uses an attenuation unit at a splice location that will severely attenuate an optical signal propagating along the span at a predetermined “marker” wavelength. Particularly well-suited in combination with determining the physical location of a fault along a fiber optic cable, the arrangement allows a technician to use an OTDR at the marker wavelength to determine both the physical location of the fault as well as the physical location of a change in ownership (if any) between the technician and the fault location, since the presence of the attenuation unit will register as a large step-wise change in signal propagation.

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“Maintenance method using 1650-nm wavelength band for optical fiber cable networks”; Nakao et al.; Lightwave Technology, Journal of, vol. 19, Issue 10, Oct. 2001; pp. 1513-1520.

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