| 摘要 |
<p>1493138 Optical fibre network PATELHOLD PATENTVERWERTUNGS UND ELEKTROHOLDING A.G. 26 Nov 1974 [28 Nov 1973] 51171/74 Heading G1A [Also in Division G2] An optical fibre network comprises a solid lightconducting element 1, with transmitter optical fibres 4 and receiver optical fibres 5 optically connected to end-faces 1' and 1" respectively, and of such length that fibres 5 are illuminated by light from each fibre 4. Each station 2 contains a transmitter S, coding facility CT and optionally a receiver E with a photodiode. Transmitters S and addressing unit 3 have LED's. The information content of individual subscriber stations is sampled cyclically by Unit 3 via a network from the junction points of which optical conductors lead to the stations. When an address code is emitted it reaches all fibres 5 and when a called transmitter begins to operate its receiver is disconnected. Information from a transmitter is accepted only by stations programmed to the same address. The element 1 is of glass perhaps with a specularly reflective surface or coated with glass of a lower refractive index and of length such that light from each fibre 4 is distributed substantially uniformly among fibres 5 of the same optical density as the glass, and with the end-faces convex. The transmitter and receiver fibres may all be connected to the same end of element 1, the other end being reflecting, and for each station may combine into a single fibre near element 1. Stations may be in groups, with a coupling element per group. The elements are linked by fibres. Repeaters may be included.</p> |
