title: Mode-cutoff frequencies of coaxial optical couplers.
abstract: The cutoff frequencies of coaxial optical couplers have been computed using the transverse resonance technique. It is shown that a coupler supports normally at least three modes. The results are applicable to both coaxial couplers and segmented-core fibers of the same profile.
authors.forename: A C
authors.initials: AC
authors.lastname: Boucouvalas