Excerpt from Optical Fiber, Fiber Coating, and Connector Ferrule Geometry<br/><br/>Interlaboratory measurement comparisons, dealing with geometrical parameters of optical fibers, fiber coatings, and fiber connector ferrules (including steel pin gages used to determine ferrule inside diameter), have been coordinated by nist. The international fiber (glass) geometry comparison showed better agreement among participants, for all measured parameters, than in previous comparisons. Many participants' test sets were calibrated for fiber cladding diameter measurements by means of calibration artifacts from nist or other national standards laboratories; there was significantly better agreement among those participants than among participants whose test sets were not calibrated. In the other comparisons, some parameters showed large systematic offsets between participants' data; accurate calibration, for those parameters, would lead to better interlaboratory agreement. Nist is developing ferrule, pin gage, and coating calibration artifacts. Key words: calibration; fiber coatings; fiber connector ferrule; geometry; geometrical parameters; optical fiber; pin gage.
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