| 摘要 |
A passive optical fibre network is divided into regions (three regions as shown), respective star coupler means (3:7, 8) being associated with each region. Full interconnection cabling (fibre) is only required between the regions. The star coupler means for each region can comprise a separate coupler (7) for the transmitter nodes (T) and a separate coupler (8) for the receiver nodes (R), in which case the optical losses are nominally equal for each possible transmitter to receiver path and wavelength division multiplexing can be employed. Upon failure of one coupler or one inter-coupler fibre the remaining regions can still communicate. <IMAGE>
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