Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1990-01-09
1992-08-04
Coles, Sr., Edward L.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359159, 359173, H04B 1012
Patent
active
051364107
ABSTRACT:
A fully redundant safety interlock system is provided comprising, means for detecting the loss of light on a fiber optic link; controller means, coupled to said means for detecting, for determining the safety condition of the link based on the output of said means for detecting, and for controlling the radiant energy output of an optical transmitter, based on the determined safety condition, via redundant output control signals; and means, coupled to said controller means, responsive to said redundant control signals, for interconnecting the output of said controller means to transmitter drive circuitry to thereby adjust the radiant energy output by the transmitter. According to a preferred embodiment of the invention, the controller means includes an electronic implementation of two independent state machines, each of which redundantly determines the connection state of the optical link between two optical link cards. The output from the state machines is used to adjust (for example, turn on and turn off) the drive circuitry for the transmitter via fully redundant paths which carry the redundant control signals.
REFERENCES:
patent: 4797556 (1989-01-01), Marzari et al.
patent: 4899043 (1990-02-01), Mochizuki et al.
patent: 4994675 (1991-02-01), Levin et al.
Heiling Gerald M.
Knodel David A.
Peterson Michael J.
Schuelke Brian A.
Siljenberg David W.
Anglin J. Michael
Coles Sr. Edward L.
Forrest Bradley A.
IBM Corporation
Kaliko Joseph J.
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