COMBINED APPLICATION OF BROADBAND AND ULTRA-NARROWBAND DISCRETE FREQUENCY PACKETS FUNDAMENTALS FOR CREATING COMPACT MICROWAVE PHOTONIC ANALYZERS OF BROADBAND AMPLITUDE MACH-ZEHNDER MODULATORS AND PHOTODETECTORS SPECTRAL CHARACTERISTICS. PART I

Abstract

Precise transmission of the signal spectrum is necessary for building 4G mobile digital networks (tens of Gbit/s) consisting of multiple base radio stations and remote radio nodes, which actualizes the task of monitoring the spectral characteristics of wideband Mach-Zehnder amplitude modulators (WB AMZM) and photodetectors (WB PD), on the basis of which fiber-optic transport domains connecting the specified stations and nodes are built. In the transport domains of 5G mobile systems, the required bitrate for the connection will be even higher (hundreds of Gbit/s). In addition, in 5G and higher mobile systems, analog "radio-over-fiber" channels containing WB AMZM and WB PD are also used to build transport domains and inter-node connections in order to maintain their required bitrate or throughput. This technology belongs to microwave photonics. Additionally, we can talk about the widespread use of WB AMZM and WB PD in microwave photonic sensor systems. The objective of this work, consisting of three parts, is to solve the problems of combined application of the fundamentals of wideband and ultra-narrowband discrete frequency packages (WB DFP and UN DFP) to improve the metrological characteristics, minimize the structure and reduce the cost of radio-photonic analyzers of spectral characteristics WB AMZM and WB PD, implemented on the import-substituting element base. The first part considers the issues of constructing a symmetrical dual-band multi-frequency probing radiation with a suppressed carrier and equal component amplitudes, which is the basis of the WB DFP, and evaluates its functional and system characteristics necessary to achieve the goal of the work.