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Non-linear effects of intensity-modulated and directly detected optical links on receiving a linear frequency-modulated waveform
, Article IET Optoelectronics ; Volume 5, Issue 6 , 2011 , Pages 255-260 ; 17518768 (ISSN) ; Akbari, M ; Sharif University of Technology
Abstract
Limitations imposed by the non-linearity of optical links, in the front end of a receiving array antenna, on the performance of a pulse compression radar are studied. Particularly linear frequency-modulated waveforms backscattered from a pair of targets are inspected. Inter-modulation and gain compression by noise are presented as two remarkable phenomena. For an interconnection of two dual-drive Mach-Zehnder modulators, the sensitivity of the compressed echo at the output of a matched filter receiver to certain tunable parameters is studied numerically. Finally, certain values of DC bias and phase shift between the modulators' electrodes are recommended