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 III. Microwave Photonic Analyzer of Spectral Characteristics for Wideband Photodetectors Based on Dual-Band Multi-Frequency Probing Radiation Obtained by Frequency Multiplication

The objective of this work, consisting of four parts, is to solve the problems of combined application of the principles of wideband (WBDFP) and ultra-narrowband (UNBDFP) discrete frequency packages for improving the metrological characteristics, minimizing the structure and reducing the cost of microwave photonic spectral characteristic analyzers (MPSCA) for wideband electro-optic modulators and photodetectors, implemented on the import-substituting element base. The first part considers the issues of forming a dual-band dual-frequencies probing radiation (DDPR) with a suppressed carrier and equal component amplitudes, which form the basis of a WBDFP, and evaluates its functional and system characteristics necessary to achieve the purpose of the work. The second part of the work presents the principles of analyzing a DDPR converted into a wideband photodetector, based on a simple in structure microwave photonic interrogator, which differs significantly in the operating principle from an EVA and allows to reduce the cost of a MPSCA as a whole due to the exclusion of the latter. Using the example of symmetrical DDPR synthesized on the basis of scanning frequency multiplication and principles of microwave photonic interrogation, this third part of the work shows the principles of constructing a broadband MPSCA with a six-fold increase in the frequency response measurement range.

broadband photodetector, microwave photonic spectral characteristics analyzer, frequency multiplication, wide band discrete frequency package, microwave photonics, microwave photonic interrogator