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A proposed modification to the component geometry of a fibre amplifier repeater which allows on on-board cable fault location facility to be incorporated is reported. The measurement technique, based on OTDR, allows cable breaks in the section of optical fibre between two fibre amplifier repeaters to be located.<<ETX>>
The provision of a supervisory/service channel on digital transmission systems by direct modulation of the transmitted data bit rate is described. The technique is examined in the context of high bit rate fibre optic system applications and both theoretical as well as practical results are presented.
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