Multi mode fiber are optical fibers which support multiple
transverse guided modes for a given optical frequency and
polarization. The number of guided modes is determined by the
wavelength and the refractive index profile.
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There are actually three modes: 1, 2, and 6.The mode/modes of a set is/are the members that occur most frequently. If multiple members tie for the most frequent, then they all are modes.
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The mode is the number in a list of numbers that occurs most
often. There may be multiple modes.