On the Propagation through Annular Core Optical Fiber under DB Boundary Conditions

|In this paper, we investigate the propagation behavior of electromagnetic waves through coaxial optical (cid:12)ber bounded with DB-boundaries. For this purpose, an eigenvalue equation is derived by using suitable DB-boundary conditions to determine the allowed values of propagation constant (cid:12) for each propagating mode. Moreover, we have analyzed the electric (cid:12)eld and power distribution patterns through coaxial optical (cid:12)ber for different propagating modes and dimensions, respectively. Our results show that small dimensional guide con(cid:12)nement remains maximum close to the lower interface of the guide, whereas, for larger dimensions, it shifts toward the upper interface. Investigations show that high power is con(cid:12)ned by H 12 mode compared to H 11 mode, and, therefore, shows contrary behavior compared to commonly used (cid:12)bers.