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Low Confinement loss and Low Crosstalk Ring Core Quadruple Clad Optical Fiber

In the present paper, a ring core quadruple clad optical fiber of silica glass has been proposed. The fiber has been designed in such a way that with air hole at the central layer and a certain difference in refractive indices between consecutive layers (which including ring core layer and cladding layers) can exist. The effect of variations of difference in refractive index and effective refractive index on phase constant of dispersed waves, effective mode area and dispersion of the propagating signal are also studied. It is found that the confinement loss and crosstalk will be reduced with air hole at the central layer as well as the difference between the effective refractive index between consequtive modes are higher in ring core quadruple clad multimode optical fiber. The overall reduction in confinement loss and multimodal dispersion losses would lead to greater spectral efficiency at the receiver end of the optical fiber communication channel.