invention the optical fiber 14 is interconnected with objects that are to be protected such as the box frame 20 and the pole 22 the ends 16 18 of optical fiber 14 are then connected in light communication with the circuit box 12 this connection optically aligns the emitter 36 with input end 16 of optical fiber 14 and aligns the detector 46 with output end 18 of the optical fiber 14 the system 10 is then activated upon activation of the system 10 the carrier 26 begins to generate a random signal as indicated above this signal can be either digital or analog so long as its behavior is unpredictable consider for example a sinusoidal wave this signal will be characterized by any number of parameters which include all of the characteristics mentioned earlier importantly for the present invention these characteristics can and will vary randomly about a set operating point this deliberate randomness will occur for various reasons for instance environmental conditions such as temperature and aging will vary over time and these environmental variations will cause the output of carrier 26 to vary accordingly also power variations and other system conditions which are not continuously controlled will also contribute to the randomness of the carrier 26 it is important for the present invention that the random carrier 26 be connected to both the emitter 36 and to the detector 46 consequently whenever the emitter 36 is triggered by a signal from carrier 26 the detector 46 will be simultaneously triggered by this same signal thus there.