We developed a matrix theory that applies to with non-circular/circular but concentric layers fibers. And we compute the dispersion characteristics of radially unconventional fiber, known as Asymmetric Bragg fiber. An attempt has been made to
determine how the modal characteristics change as circular Bragg fiber is changed to asymmetric Bragg fiber. The key to this
transfer matrix method (TMM) is the accurate calculation of the propagation constants of modes. And validity of this method is
verified by FDTD method. We compare these results with obtained from finite difference time domain and find excellent
agreement between the two approaches.