| 摘要 |
<p>When data is transmitted between relatively rotating members in the form of electrical signals, this can be done using slip ring contacts. If, however, the information is required to be transmitted in optical form conventional slip rings obviously cannot be used. The problem is particularly acute when the information is to be transmitted along more than one optical line which would become twisted. Figure 2 shows a multiplexer (6) which multiplexes data from a number of inputs (5), each carrying light of different wavelengths lambda 1, lambda 2, lambda 3, lambda 4, onto a common optical line (7). This passes from one member (1) to another member (2) via a rotary joint (8) on the axis of rotation (X). The data is then demultiplexed by a demultiplexer (9) onto optical fibre outputs (10) which correspond to the inputs to the multiplexer (6) and carries the same wavelength lambda 1, lambda 2, lambda 3, lambda 4 as the inputs. Thuds by multiplexing the data only one line need be used and the rotary joint prevents the one becoming twisted. <IMAGE></p> |
