Waves in coaxial optical fiber under DB-boundaries

Investigations are made of the wave propagation through coaxial optical fiber composed of dielectric medium with inner and outer surfaces bounded with DB-boundary. Eigenvalue equation for the system is deduced and the energy flux density patterns corresponding to the propagating hybrid modes in the guide are analyzed by varying the radial dimensions of it. The efficacy of the use of DB-boundary is predicted in the form of power content of higher modes in the guide.