Intermodulation distortion analysis of a complex signal in a microwave optics transmission line

Andrey D Shcherbinin,Alexander S Kondrashov,A Belov Leonid,P Yermolov

doi:10.1051/itmconf/20193014002

Andrey D Shcherbinin, Alexander S Kondrashov + Show 2 more

Open Access

https://doi.org/10.1051/itmconf/20193014002

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Abstract

The requirements for RF fiber optic links for placement on board an Earth satellite or other spacecraft [1–3] are distinguished by a combination of additional hard indicators: by weight, overall dimensions; energy efficiency of the power supply; radiation resistance; reliability of long-term autonomous functioning; out-of-band emission level; cost. Therefore, the development of such devices is relevant and in demand.

Highlights

MeasurementsB) with an increased power level of the input test two-frequency signal, which leads to gain compression near the saturation (reduction of the transmission coefficient) by 3.5 dB, the relative level of the third-order IMR components monotonically increases; c) the second-order IMR level at the indicated gain compression value is an unacceptably high level of -15 dB, and of a higher odd order it pulsates with increasing modulation depth, reaching -35 dB
The development of fiber-optic communication lines for on-board satellite equipment requires taking into account [4,5,6] the influence of the manifestations of chromatic and polarization dispersion characteristic of the optical range in the band of used optical frequencies, noise, and the use of measures to linearize the nonlinear amplitude, phasefrequency, and intermodulation characteristics of the transmitted microwave signal in the components of the fiber-optic cable
The transfer of an information microwave signal to an optical carrier wave and its inverse recovery in an onboard fiber optic communication line (FOCL) is accompanied by noise and nonlinear [7] distortions and noise in the light source, modulator, fiber, and photodetector

Summary

Measurements

B) with an increased power level of the input test two-frequency signal, which leads to gain compression near the saturation (reduction of the transmission coefficient) by 3.5 dB, the relative level of the third-order IMR components monotonically increases; c) the second-order IMR level at the indicated gain compression value is an unacceptably high level of -15 dB, and of a higher odd order it pulsates with increasing modulation depth, reaching -35 dB

Distortion of microwave signals in on board satellite RF-FOCL

Findings

Conclusion