| 摘要 |
Each optical head of a free space optical data link includes a lens (21, 22) at whose focus an end of an optical fibre (23, 24) is arranged. The opto-electronic transducers (25, 28), for converting electronic signals to be transmitted to optical form and converting received optical signals to electronic form, are arranged at the other ends of the optical fibres so that the transducer may be arranged remotely from the optical heads, for example in the buildings on the roofs of which the optical heads are arranged. Adjustment means for use in aligning the optical heads is described with reference to Figs. 1 and 3 and a method of achieving maximum transmitted signal amplitude is described with reference to Fig. 2. Instead of lenses, reflective or catadioptric systems may be employed, for example a parabolic mirror. The optical fibre may be mounted by means of a spider arrangement (Fig. 4) with respect to a mirror. <IMAGE>
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