| 摘要 |
An optical transmission arrangement comprises a transmitter (T1) at a first location for transmitting to a receiver (R1) at a second location. The first transmitter (T1) has a plurality of selectively activatable optical emitters (1.1 to 5.5) which are so arranged that light from each emitter leaves the transmitter at a different angle. In one embodiment the receiver (R1) detects the angle at which the light arrives and causes an error signal to be transmitted back to the first location to control which of the emitters is activated. Alternatively, a second transmitter (T2) transmits an independent pilot signal to a second receiver (R2) at the first location which detects the angle at which it arrives, and the detected angle is used to control which of the emitters of the first transmitter (T1) is activated. The transmitter (Figs 1-3) comprises an array of fibres (1.1-5.1) associated with respective lasers (or a single laser coupled to the fibres) and embedded in a plate (P) aligned with a plano-convex lens (L) causing the light from each fibre to emerge at a unique angle. <IMAGE> |
