Superstructured addressed fiber Bragg structures for differentiation and integration of UWB signal envelopes in microwave photonic systems

Recently, much attention has been paid to the analog implementation of basic operations for converting ultra-wideband (UWB) signals using fiber-optic element base and microwave photonics technologies. Some of the main analog operations are the operations of integrating and differentiating an ultra-wideband signal (integrating and differentiating its envelope transferred to the optical region). Devices implementing this operation are of interest for a wide range of applications, such as the formation of time pulses of a given shape for radars and UAV control, wireless telecommunications in the radio range, as well as ultra-fast optical information processing, optical computing, optical recognition and coding. To solve optical integration and differentiation problems, various Bragg grating variants have been proposed. A common disadvantage of such structures is their relatively large longitudinal size, ranging from one to several centimeters, especially when implementing high integration and differentiation orders. At the SPIE OTT-23 conference, we demonstrated addressable fiber Bragg Moiré structures for length shortening that additionally perform the functions of monitoring the position of the central Bragg wavelength and the carrier of the processed UWB envelopes. However, even in this case, the structure length reaches 5–7 cm. In this paper we want to present multicomponent addressable fiber Bragg structures (AFBS) with π-shift for its three or more times shortening.