Optical communications transmitter and receiver

Details Optical communications transmitter and receiver Optical communications transmitter and receiver

H - Electricity

04

L

325/1, 340/165

H04L 25/66 (2006.01) H04B 10/12 (2006.01) H04L 5/24 (2006.01) H04L 7/06 (2006.01) H04L 25/40 (2006.01) H04L 7/04 (2006.01)

Patent

CA 1333725

An improved digital communications system is disclosed in which synchronization information is transmitted with the data. A start pulse, having a duration different than the other pulses in the transmitted digital data signal is used to mark the beginning of the frame of digital data. Preferably, a midpoint pulse is also transmitted with the start pulse to mark the midpoint of the frame to facilitate the generation of a local clock signal. Bit positions within the transmitted signal are sampled by sampling pulses which are generated by digital timers having time intervals keyed to the start and midpoint pulses.

542765

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