Two level fiber optic communication from three-value electronic

Details Two level fiber optic communication from three-value electronic Two level fiber optic communication from three-value electronic

1992-01-23

1993-12-21

Chilcot, Jr., Richard E.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359118, 359143, 359152, 359184, 370 32, 375 55, 455 78, H04B 1012, H04B 1000, H04J 1500, H04L 514

Patent

active

052725588

ABSTRACT:
A fiber optic extender system in which messages are transferred by fiber optic lines between remotely located electronic units. The electronic units (e.g., transformer-isolated) have three signal levels: positive voltage, negative voltage, and zero voltage. Because the fiber optic system can conveniently handle only two signal levels--on and off--potentially serious communication problems are avoided by generating and transmitting a short end-of-message pulse whenever the transmitting electronic unit is at zero voltage level. This end-of-message pulse is detected at the remote electronic unit, and the line is cleared for the next message.

REFERENCES:
patent: 3914537 (1975-10-01), Perreau et al.
patent: 4000371 (1976-12-01), Ogawa
patent: 4399563 (1983-08-01), Greenberg
patent: 4654844 (1987-03-01), Mandello
patent: 4718118 (1988-01-01), Viola
patent: 4850046 (1989-07-01), Philippe

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