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Testing high-resolution optical spectrum analyzers for characterization analog optical links with external modulation
https://doi.org/10.32446/0368-1025it.2022-12-40-45
Abstract
The characterization of analog optical links is considered and it is noted that the study, accounting and reduction of nonlinearities introduced by the elements of the optical link into the output signal during photodetection are of particular practical interest. Methods for analyzing nonlinear distortions of analog optical paths with external modulation are presented and it is proposed to use high-resolution optical spectrum analyzers for their characterization. The analysis methods use the results of measurements of the optical spectrum, which directly characterize the optical signal of the link without taking into account the influence of nonlinearities introduced during photodetection. An analytical model of the process of modulation of monochromatic light radiation by a two-tone radio frequency signal using an electro-optical Mach-Zehnder modulator is presented. The relationship between the nonlinear spectral components of the optical modulated and radio frequency signals at the photodetector output is considered. The optical and radio frequency spectra of AOL signals were experimentally studied on a specially assembled measuring stand. The results of experiments on measuring SFDR of analog optical paths using high-resolution radio frequency and optical spectrum analyzers are presented. Possible reasons for the degradation of the SFDR during photodetection are discussed. Using an analytical model of nonlinearities of the Mach-Zehnder modulator, the contribution of the nonlinearity of photodetection to the distortion of the output signal of the optical link is experimentally estimated and the differences in the power of intermodulation products for microwave photodiodes of two types are demonstrated.
Keywords
Microwave photonics,
analog optical link,
Mach-Zehnder modulator,
nonlinear distortions,
spurious free dynamic range
Supporting agencies: The reported study was funded by Russian Foundation for Basic Research (RFBR), project number 20-37-90119.
About the Authors
V. A. Nebavskiy
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)
Russian Federation
Russian Federation
Vsevolod A. Nebavskiy
Moscow
R. S. Starikov
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)
Russian Federation
Russian Federation
Rostislav S. Starikov
Moscow
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For citations:
Nebavskiy V.A., Starikov R.S. Testing high-resolution optical spectrum analyzers for characterization analog optical links with external modulation. Izmeritel`naya Tekhnika. 2022;(12):40-45. (In Russ.) https://doi.org/10.32446/0368-1025it.2022-12-40-45
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