Designing a class of asymmetric twin core photonic crystal fibers for switching and multi-frequency generation

This paper proposes a class of novel asymmetric twin core photonic crystal fiber (ATPCF) structures for the applications of all-optical coupling, switching and multi-frequency generation. Typically, here we discuss how the variety of ATPCF can be designed by suitably changing the radius and refractive index of the guiding cores. By considering different possible structures of ATPCF, the impact of the different nonlinearity, group velocity dispersion, dissimilar effective mode area and different extinction coefficient contribution to the pulse dynamics and steering characteristics have been deeply investigated. In the linear regime, the proposed ATPCF designs, show symmetrical behavior for all the configurations, and robust to the structure induced asymmetry. On the other hand at nonlinear regime, the ATPCFs exhibit good switching contrast. As a consequence, we also observed that out of all configurations, ATPCF design of different radius with different index configuration exhibits a significant broadened wavelength spectrum.