Fault location arrangement for digital optical transmission...

Details Fault location arrangement for digital optical transmission... Fault location arrangement for digital optical transmission...

H - Electricity

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H04B 17/00 (2006.01) G01R 31/08 (2006.01) H04B 10/08 (2006.01) H04L 5/04 (2006.01)

Patent

CA 1201769

14 ABSTRACT: A fault location arrangement for a digital optical transmission system employing repeaters has at each repeater an opto-electrical converter and an elec- tro-optical converter. The output of the opto-electrical converter is fed via an AGC amplifier and a regenerator to a modulator which comprises a two pole two way switch, a single pole two way switch and two current sources. The two pole switch is controlled by the regenerated data while the single pole switch is controlled by a fault location signal. The arrangement is such that fault * information is transmitted by amplitude modulation of the digital signal but that the average power applied to the electro-optical converter remains constant. Hence the amplitude modulation does not cause a varying dissipation in the converter and hence reduces the possibility of variation of the wavelength emitted by the converter.

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