Chapter 10 APPENDIX
10-12
Group index
Expressed by the ratio of the speed of light traveling in a vacuum to that traveling in a
substance, and calculated by the following formula.
N=Speed of light traveling in a vacuum / Speed of light traveling in a substance
Group index (N) for SMF is generally around 1.48000.
Label
A comment that can be attached to the trace.
For the method of entering a label, refer to page 4-3.
Least squares approximate (LSA)
Least squares approximate is the method by which a loss measured between two points.
Since this method uses all of the data between two point.
For details on least squares approximate, refer to page 3-37.
Near end
Connection point between the instrument and optical fiber and its surrounding area.
For details on near end, refer to page 1-40.
OTDR
Abbreviation for “Optical Time Domain Reflectometer”. OTDR emits a pulsed ray into an
optical fiber and acquires its reflected ray. The acquired data is then processed to display
a graph of loss distribution versus distance.
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