Optical fail safe device

Details Optical fail safe device Optical fail safe device

1982-07-06

1988-04-26

Sikes, William L.

350 9613, 350 9610, G02B 628

Patent

active

047400501

ABSTRACT:
An output device is disclosed including a first light light guide having an input port and an output port; a second light guide adapted to allow light to be inserted into said first light guide at a first location in said first light guide; means for absorbing light propagating through a second location in said first light guide, said second location being between said input port and said first location; and means for allowing the detection of information concerning light propagating in said first light guide, said means for allowing detection being located between said input port and said first location. Four embodiments are presented, each being integrated optical devices adapted to provide fail safe protection when used in a bus line system.

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patent: 3874782 (1975-04-01), Schmidt
patent: 3976358 (1976-08-01), Thompson
patent: 4023887 (1977-05-01), Speers
patent: 4142877 (1979-03-01), Auracher et al.
patent: 4161651 (1979-07-01), Sano et al.
patent: 4166946 (1979-09-01), Chown et al.
patent: 4233589 (1980-11-01), Rawson et al.
patent: 4246475 (1981-01-01), Altman
patent: 4252402 (1981-02-01), Puech et al.
patent: 4406513 (1983-09-01), Raphael

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