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Single-mode fibers feature a smaller core diameter than multimode fibers, enabling the single-mode transmission within the operating wavelength range. This design improves the transmission performance and reliability of single-mode fibers. Single-mode fibers are widely used in communication fields, including long-distance fiber optic communication, data center interconnection, wireless base station backhaul, CATV, fiber optic sensing, etc. This case aims to demonstrate a simple mode calculation by taking SMF-28 single-mode fiber as an example.

Bragg fiber is a type of air-core fiber that allows light to propagate in the air core, which avoids problems caused by intrinsic material limitation. In this example, we use SimWorks Finite Difference Solutions to calculate the modes of the PC Bragg fiber described by Vienne et al and further compare the results with those from Uranus et al.