Dynamic rejection of multiple co-site interferers through wideband RF photonic notch filter

Antennas in congested RF environments are susceptible to co-site interference. Interfering signals are usually stronger than the signal of interest by several orders of magnitude, and offset in frequency but within the bandwidth of the antenna. We present an optical technique to mitigate interfering...

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Bibliographic Details
Main Authors: Middleton, C., Borbath, M., Wyatt, J., DeSalvo, R.
Format: Conference Proceeding
Language:English
Subjects:
Optical attenuators
Optical distortion
Optical filters
Optical modulation
Optical noise
Optical receivers
Optical sensors
Radio frequency
RF signals
Wideband
Online Access:Request full text
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Summary:Antennas in congested RF environments are susceptible to co-site interference. Interfering signals are usually stronger than the signal of interest by several orders of magnitude, and offset in frequency but within the bandwidth of the antenna. We present an optical technique to mitigate interfering signals by generating nulls at specific frequencies using a dual-output Mach-Zehnder modulator, optical delay, and balanced detectors. We demonstrate the nulling of interfering signals by over 40 dB without attenuating the signal of interest.
ISSN:2155-7578
2155-7586
DOI:10.1109/MILCOM.2008.4753055