Clock decoder and data bit transition detector for fiber optic w

Details Clock decoder and data bit transition detector for fiber optic w Clock decoder and data bit transition detector for fiber optic w

1988-01-25

1989-12-19

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 95, 375110, 307234, 328108, H03K 910, H04L 702

Patent

active

048887919

ABSTRACT:
Apparatus for use in a fiber optic transmission system having a variable bit rate and a variable duty cycle. The system senses data bit transmissions of bi-phase encoded data, and provides a restored clock frequency corresponding to a clock encoded in the bi-phase data. Midbit zero data transmissions are distinguished from the transitions denoting the beginning and end of a data pulse to define the pulse duty cycle. A logic circuit transfers operation between high speed and low speed modes of operation.

REFERENCES:
patent: 3979746 (1976-09-01), Jarrett
patent: 4267595 (1981-05-01), Hernandez
patent: 4675597 (1987-06-01), Hernandez

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