<title>Microstructured multimode optical fiber for differential mode delay compensation</title>

Abstract

Design of differential mode delay compensating microstructured multimode fiber (MMF-DCF) and microstructured multimode fiber optimized for 0,85 mkm wavelength window which imitate ideal graded refractive index profile of conventional multimode fiber are presented in this paper. The main feature of the proposed fibers is that they are capable of being constructed without the need of germanium doping, this type of fibers are known as microstructured fibers. The axially oriented small air holes, that run the entire fiber length, are configured to provide required refractive index profile and more focused interaction with selected modes. Results of microstructured multimode fiber and differential mode delay compensating microstructured multimode fiber design and results of group velocity calculation for selected modes with full vector finite element method are presented. It is shown that the proposed approach enables the synthesis of microstructured MMF-DCFs and provides resulting group velocities diagram of the excited modes, close to the desired optimal.