Image-reject downconverter plays an essential role in radar receiving systems to eliminate the image interference causing by the complex electromagnetic environment. In this paper, we propose a broadband image rejection downconverter based on parallel installed dual-drive Mach-Zehnder modulators (DMZMs). The system is very simple without using any filters, contributing to a large working bandwidth. A simulation verification is set up. The results show that the image interference can be well suppressed ranging a wide bandwidth and the image rejection of the broadband data signal is also realized.
We propose a new beat interference cancellation receiver (BICR) to recover the polarization division multiplexing (PDM) single-sideband (SSB) signals without signal-to-signal beat interference (SSBI) by using optical filters. Our method has simple principles and structures, and it works well under a very low carrier-signal power ratio (CSPR). Also, our proposed method needs no complicated algorithms for recover the signal and mitigate the SSBI.
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