Abstract
A previously published photonic link architecture was shown to suppress a high-power interference signal of a specific amplitude while permitting recovery of lower-power signals of interest. One undesirable feature of this architecture was the generation of an output intermodulation distortion product that was inherently as strong as the output signal at the frequency of the signal of interest. This article describes a modification to the previously published interference suppression architecture that eliminates this undesirable side effect by applying aspects of one established technique for enhancing the spurious-free dynamic range of analog photonic links along with aspects of a second established technique for accomplishing single-sideband modulation of a Mach–Zehnder electro-optic modulator. The improved performance of this modified architecture is explained using a mathematical model and is verified by the measured input/output characteristics of hardware in a proof-of-concept laboratory demonstration.
Highlights
A NTENNA systems designed to receive signals across a broad range of microwave and/or millimeter-wave frequencies must increasingly contend with a crowded, or even contested, spectral map. This situation motivates development of RF interference suppression techniques to enable the recovery of weak signals of interest while attenuating strong interference signals
A low-power signal of interest (SOI) at frequency f1 plus a higher-power interferer (INT) at frequency f2 comprised the total input signal to a quadrature-biased Mach– Zehnder (MZ) interferometric modulator supplied with light from a 1,550-nm diode laser, and the output signals from a photodetector connected to the optical output of this modulator were recorded at f1 and f2, at third harmonics 3f1 and 3f2, and at Manuscript received February 1, 2020; revised March 17, 2020; accepted April 21, 2020
This paper describes a modified photonic link architecture that uses the technique described in [2] and [3] to minimize
Summary
A NTENNA systems designed to receive signals across a broad range of microwave and/or millimeter-wave frequencies must increasingly contend with a crowded, or even contested, spectral map. The least attractive feature of this interference suppression technique is the fact that the second problematic third-order distortion frequency, 2f2 – f1 (green curve in Fig. 1), is not minimized at the input power that suppresses the interferer frequency f2. The interferer power while largely preserving the power at the signal of interest, and that minimizes the output power at not just one but both of the problematic third-order intermodulation distortion frequencies
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