H - Electricity – 04 – L
Patent
H - Electricity
04
L
363/10, 363/17
H04L 25/49 (2006.01) H04B 10/00 (2006.01) H04B 10/155 (2006.01) H04B 10/207 (2006.01) H04J 3/06 (2006.01) H04J 14/08 (2006.01) H04L 25/03 (2006.01)
Patent
CA 1327413
- 44 - ABSTRACT (ref Fig 1) OPTICAL COMMUNICATIONS NETWORK A passive, all optical communications network is provided in which a single optical source in a central station serves many outstations (eg telephones in customers' premises). Time division multiplexed optical signals from a laser source are transmitted along a single optical fibre (14) from a central station (4). The signal is split between several secondary fibres at a first splitter (10) (eg array of passive couplers) and between further sets of fibres at a second set of splitters (12). At this stage there are 120 individual fibres to customers' premises (8). Digital speech or data is sent back to the central station by a laser in the customers' premises operating in a low duty-cycle mode. The 120 data streams are interleaved at the branching points.
584332
Ballance John William
British Telecommunications Public Limited Company
G. Ronald Bell & Associates
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