axis such as the central axis of the missile in this example there are four different pointing angles a b c and d and each ferrule contains a fiber bundle for each pointing angle the magnitude direction and number of different pointing angles that may be used in a practical system are a matter of design choice the fiber bundles are coupled to a plurality of optical detectors 121 a 121 d that convert incoming light into electrical signals one optical detector is provided for each pointing angle taking pointing angle u201c a u201d as an example it is seen that each collecting lens 101 104 is associated with an optical fiber bundle having a pointing angle of a i e 101 a 102 a 103 a and 104 a all four of these fiber bundles for pointing angle a are coupled to optical detector 121 a the same arrangement is repeated for pointing angles b d for another example consideration will be given to laser radiation striking collecting lens 101 a beam of laser radiation striking lens 101 from the general direction of point angle a will have most of its energy directed by lens 101 into fiber bundle 101 a lesser amounts if any of the incoming laser radiation will be directed into the light receiving ends of fibers 101 b 101 d thus the amount of energy from the incoming laser radiation passed to optical detector a through fiber bundle 101 a will be greater than the amounts of optical energy passed to the other detectors b c and d by fiber bundles 101 b 101 c and 101 d respectively again the same will be true for lenses 102 104 the amplitude of.