| Abstract [eng] |
This work presents a new type of optical device enabling non-reciprocal light transmission, whose operating principle is based on the Sagnac effect. Unlike all other types of optical isolators, whose performance depends on the properties of a chosen optical material, in this case the device operation relies on the fundamental properties of spacetime itself. This makes it possible to easily adapt the basic design of such a device to different ranges of electromagnetic radiation, as well as to both low and high radiation powers (both peak and average). The work theoretically analyzes and experimentally demonstrates three different implementations of such a device based on fiber optics. In the first configuration, which operates as a four-port circulator, an isolation of no less than 24 dB was achieved using narrowband light (λc = 1063 nm, Δλ < 1 nm). In the second configuration, operating as a non-reciprocal phase shifter, the difference between the Sagnac and Fizeau effects was investigated. In the third configuration, a transmission ratio of at least 60:1 in opposite directions of light propagation was demonstrated using broadband light (λc = 1045 nm, Δλ = 50 nm (FWHM)). Practical design solutions are also proposed, such as control of the polarization state between stationary and moving parts of the system, improvement of thermal stability, and optimization of transmission characteristics. |
