Vital railway signal link with photo-emission means

Details Vital railway signal link with photo-emission means Vital railway signal link with photo-emission means

B - Operations, Transporting

61

L

B61L 7/10 (2006.01) B61L 1/20 (2006.01) G08C 23/06 (2006.01) H04B 10/24 (2006.01)

Patent

CA 2094227

A vital railway signal link for passing DC signals between a first terminal location and a second terminal location. A transmitter at the first terminal location receives a DC input signal and responsively produces a light signal modulated at a preselected frequency. The light signal is conducted through an optical fiber to the second terminal location. There, a receiver detects the light signal and produces a DC output signal. The receiver contains discriminator circuitry preferably including a bandpass filter to prevent light signals other than those modulated at the preselected frequency from giving an output signal.

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