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'Clip-On' Optical Power Measurements

The process of measuring power in an optical fibre has to date required access to the end of the fibre. On an installed cable this could entail a lengthy procedure to cut, measure and resplice, assuming the interruption in service could be tolerated. We describe a 'Clip-on' optical power meter which does not require access to the fibre end but instead measures power through the side of the fibre. This testing method has obvious operational advantages over the former procedure.