Ovality
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In telecommunications, the term ovality is the attribute of an optical fiber, the cross section of the core or cladding of which deviates from a perfect circle. In an optical fiber, the degree of deviation, from perfect circularity, of the cross section of the core or cladding.
The cross sections of the core and cladding are assumed to first approximation to be elliptical. Quantitatively, the ovality of either the core or cladding is expressed as 2(a-b )/(a +b ), where a is the length of the major axis and b is the length of the minor axis. The dimensionless quantity so obtained may be multiplied by 100 to express ovality as a percentage. Alternatively, ovality of the core or cladding may be expressed or specified by a tolerance field consisting of two concentric circles, within which the cross section boundaries must lie. Synonym noncircularity.
Source: from Federal Standard 1037C