| 摘要 |
Novel fibre optic telephone loop networks are disclosed. In the networks, single mode fibre optics are used for feeder and distribution segments of the loop but multimode fibre optics are used for the dr ops. The use of the multimode fibre optics has permitted the use of less costly optoelectronic devices. Surface light emitting diodes are such economical but reliable parts. Fibre service terminals located near subscriber premises convert single mode operation to the multimode operation. The networks are relatively easy to install and upgrade and are very economically competitive wit h other known FTTC and FTTH schemes. In a further embodiment, the fibre service terminals have microprocessor control to reroute s ignals via redundant single mode connections to central switching office in the event of a fault in single mode fibres.
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