Synchronization of digital systems using optical pulses and mdou

Details Synchronization of digital systems using optical pulses and mdou Synchronization of digital systems using optical pulses and mdou

1996-12-30

1998-10-13

Epps, Georgia Y.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359158, 327141, G02F 103

Patent

active

058221069

ABSTRACT:
The present invention provides synchronization of logic signals in a digital system using optical pulses generated from optical modulators. In one embodiment of the present invention, electrically driven optical modulators are positioned at electrical outputs of interest, and the modulators are read out in accordance with synchronized optical pulses produced from a timing source, where the optical pulse lengths are relatively short compared to the electrical output pulse length. The resulting modulated optical pulses output from the optical modulators are then all once more synchronous, with the skew in the original electrical signals having been removed. These optical pulses can then be communicated over optical channels, such as fiber or free space, with well controlled delay, thereby also reducing problems of variable delay in electrical connections. The optical signals can then be read by photodetectors at the inputs to further stages of digital processing, giving inputs that are synchronized once more despite the different delays or skews in the original electrical signals.

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