Multiplex communications – Wide area network – Packet switching
Patent
1989-06-07
1990-11-27
Lee, John D.
Multiplex communications
Wide area network
Packet switching
350 9629, 350 9630, 370 1, G02B 628
Patent
active
049731696
ABSTRACT:
This invention relates to a technique for protecting information from intrusion that is transmitted through optical fiber. The new method relates to transmitting energy at multiple wavelengths along a single mode optical fiber. The wavelengths can be propagated in single mode or alternatively n single mode or in high order modes. Energy at one or more wavelengths constitutes guard channels which have an enhanced power loss effect by selection of an appropriate cut-off wavelength of the single mode optical fiber. These guard channels can be monitored for power loss to detect intrusion. An apparatus is also described.
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Lee John D.
Martin Marietta Corporation
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