The Toucher–Isolator game was introduced recently by Dowden, Kang, Mikalački and Stojaković. Two players, Toucher Isolator, alternately claim an edge from a graph, where plays first. aims to touch as many vertices possible, Isolator minimize the number of that are so touched. Among trees with n vertices, they showed star is best choice for asked most suitable tree Toucher. Later, Räty answer pa...

We theoretically investigate a non-reciprocal magneto-optical integrated slab directional coupler. The scattering parameters of the structure are derived in frame Coupled-Mode Theory (CMT). By properly designing coupler, it is possible to achieve perfect non-reciprocity (with 100% contrast) between two directions propagation. Other operating points can also be defined, especially since modal di...

We introduce a new type of optical isolator based on breaking time reversal symmetry in dissipative finite Su-Schrieffer-Heeger (SSH) waveguide arrays that support topological edge states at one end of the structure. In the forward propagation direction, light is launched into the edge waveguide to excite the localized topological midgap state. As a result, most of the input optical power is tr...

Monolithically InP-based photonic integrated circuits, where more than two semiconductor optoelectronic devices are integrated in a single InP substrate, have long history of research and development. Representatives of these InP-based photonic integrated circuits are, electroabsorption modulator integrated distributed feedback laser diodes (DFB LDs) (Kawamura et al., 1987, H. Soda et al., 1990...

Abstract Nonreciprocal devices, such as isolators, are of great importance for optical communication and information processing. To bypass the limitation a strong magnetic field imposed by traditional Faraday magneto-optic effect, many alternative mechanisms have been proposed to demonstrate magnetic-free nonreciprocity. However, limited drive-induced noise, noiseless isolator capable working i...