Optical communications network
CA 1301252 C · Owner: Ballance, John William · Inventors: Ballance, John William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A passive, all optical communications network is disclosed in which a single optical source in a central station serves many outstations (e.g. telephones in customers' premises). Time division multiplexed optical signals from a laser source are transmitted along a single optical fibre from a central station. The signal is split between several secondary fibres at a first splitter (e.g. an array of passive couplers) and between further sets of fibres at a second set of splitters. At this stage there are 120 individual fibres to customers' premises. Digital speech or data is sent back to the central station by a laser in the customers' premises operating in a low dutycycle mode. The 120 data …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted May 19, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 19, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.