Timing and data recovery circuit for ultra high speed optical co

Details Timing and data recovery circuit for ultra high speed optical co Timing and data recovery circuit for ultra high speed optical co

1998-01-06

2000-06-13

Vo, Don N.

Pulse or digital communications

Receivers

375355, 375359, H04L 2706

Patent

active

060758252

ABSTRACT:
In an ultra high speed optical communications system, the clock signal from a data stream in NRZ format is recovered using an inexpensive, low Q filter. Resulting clock jitter is reduced with a clock divider which lowers the speed of the signal by 1
, where n is a an integer. The divided clock signal is filtered again by a low frequency high Q filter. This invention eliminates the need for a costly high frequency high Q filter, while providing a divided down clock for data de-multiplexing. At the lower speed, an inexpensive D flip flop is used with the divided down clock for data recovery.

REFERENCES:
patent: 5164966 (1992-11-01), Hershberger
patent: 5589683 (1996-12-01), Nakai
patent: 5671258 (1997-09-01), Burns et al.
patent: 5710649 (1998-01-01), Mollenauer
patent: 5748325 (1998-05-01), Tulip
patent: 5828216 (1998-10-01), Tschudin et al.

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