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    • 8. 发明授权
    • Intrusion-free optical cable
    • 无入侵光缆
    • US4314741A
    • 1982-02-09
    • US104476
    • 1979-12-17
    • Czeslaw DeminetJames F. Kenney
    • Czeslaw DeminetJames F. Kenney
    • G02B6/44G02B5/14
    • G02B6/4469
    • An intrusion-free optical cable of the type wherein one or more signal-carrying optical fibers are carried within an outer cladding which will self-destruct, with or without destruction of the inner signal-carrying fiber, in the event an attempt is made to penetrate the outer cladding and extract a signal. Self-destruction is sensed to indicate that an attempt has been made to penetrate the outer cladding. Various embodiments of the invention are shown including a cladding formed from tempered glass which will shatter when an attempt is made to penetrate it. In another embodiment, a laser is employed which directs a light beam through the cable. This light beam is of sufficient power to melt, or at least raise the temperature of, the cladding or fiber at a point where penetration is attempted such that the severance or rise in temperature can be detected.
    • 一种无入侵的光缆,其中一个或多个信号承载光纤被携带在外部包层内,在外部包层中,在外部包层中会有内部信号承载光纤的破坏而自毁, 穿透外包层并提取信号。 感觉到自我破坏,表明已经尝试穿透外包层。 示出了本发明的各种实施例,其包括由强化玻璃形成的包层,当试图穿透时,其将破裂。 在另一实施例中,采用引导光束穿过电缆的激光器。 该光束具有足够的功率来熔化或至少提高包层或纤维的温度,从而可以检测渗透的点,从而可以检测到切断或温度上升。