Structural design and characteristics of dual-mode fibers with equalized group velocity.


We investigate how the index profile of a few-mode fiber (FMF) can be designed so that group velocities of the two lowest-order modes can be equalized at a normalized frequency, which is below the cut-off frequency of the LP21 mode. This can be achieved using a single-clad power-law profile with a sufficiently large profile exponent or a double-clad profile… (More)
DOI: 10.1364/JOSAA.31.001462


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