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In fiber optics, mode volume is the number of bound modes that an optical fiber is capable of supporting.
The mode volume M is approximately given by V 2 2 {\displaystyle V^{2} \over 2} and V 2 2 {\displaystyle {V^{2} \over 2}\left} , respectively for step-index and power-law index profile fibers, where g is the profile parameter, and V is the normalized frequency, which must be greater than 5 for this approximation to be valid.
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