Fiber optic switching system with link monitoring

Details Fiber optic switching system with link monitoring Fiber optic switching system with link monitoring

1986-03-04

1988-09-27

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250229, 340365P, H01J 516

Patent

active

047744073

ABSTRACT:
A fiber optic switching system for industrial control sensing applications includes a link monitoring capability for detecting faults in the fiber optic cable. Two transmitters of different wavelengths are coupled into a single fiber. The switch utilizes an optical filter which when inserted in the optical path blocks one wavelength of light but allows the other to pass through. The absence of all light in the switch output indicates a fault and the presence or absence of the filtered-out light is used to determine the switch state.

REFERENCES:
patent: 4152043 (1979-05-01), Albanese
patent: 4274706 (1981-06-01), Tangonan
patent: 4303303 (1981-12-01), Aoyama
patent: 4315147 (1982-02-01), Harmer
patent: 4376566 (1983-03-01), Blackington
patent: 4429231 (1984-01-01), De Loach, Jr. et al.

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