Optical waveguides – Optical waveguide sensor
Reexamination Certificate
2006-10-10
2006-10-10
Connelly-Cushwa, Michelle (Department: 2874)
Optical waveguides
Optical waveguide sensor
C398S020000, C398S028000, C398S033000
Reexamination Certificate
active
07120324
ABSTRACT:
A method and system of intrusion detection system for a multimode fiber optic cable. A light signal is launched into the cable fiber to establish a narrow spectral width, under-filled non-uniform mode field power distribution in the cable. A small portion of the higher order signal modes arriving at the remote end of the cable is sampled and monitored for transient changes in the mode field power distribution. The power distribution changes with physical disturbance of the cable. When those changes are detected as being characteristic of fiber intrusion, the system activates an alarm. This method can sense and alarm any attempt to access the optical fibers in a fiber optic communication cable. In preferred embodiments, the active signal of a multimode optical fiber is monitored for both signal degradation and transient power disturbance patterns that could indicate fiber damage or physical intrusion. A translator can be provided in an existing optical fiber system in which the data signals are translated in wavelength and/or launch conditions to optimize the monitoring signals in an otherwise non-optimized system.
REFERENCES:
patent: 4297684 (1981-10-01), Butter
patent: 4843233 (1989-06-01), Jeunhomme
patent: 5680104 (1997-10-01), Slemon et al.
patent: 6819849 (2004-11-01), Tangonan et al.
patent: 6937151 (2005-08-01), Tapanes
patent: 2001/0024162 (2001-09-01), Lee
patent: 2003/0035615 (2003-02-01), Foltzer
patent: WO 96/08695 (1996-03-01), None
patent: WO 00/37925 (2000-06-01), None
patent: WO 00/67400 (2000-11-01), None
Bridges Mark K.
Murphy Cary R.
Vokey David E.
Battison Adrian D.
Connelly-Cushwa Michelle
Dupuis Ryan W.
Network Integrity Systems Inc.
Williams Michael R.
LandOfFree
Intrusion detection system for use on an optical fiber using... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Intrusion detection system for use on an optical fiber using..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intrusion detection system for use on an optical fiber using... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3718739