TY - JOUR
T1 - Incoherent method of optical interference cancellation for radio-frequency communications
AU - Suarez, John
AU - Kravtsov, Konstantin
AU - Prucnal, Paul R.
N1 - Funding Information:
Manuscript received July 08, 2008; revised October 30, 2008. Current version published March 25, 2009. This work was supported by Battelle-Chapel Hill Operations under Contract TCN 08004. The authors are with the Department of Electrical Engineering, Princeton University, Princeton, NJ 08544 USA (e-mail: suarezj@princeton.edu). Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/JQE.2009.2013106
PY - 2009
Y1 - 2009
N2 - In this paper, we describe a system for cancelling radio-frequency (RF) interference using optical techniques. Specifically, we attempt to receive a weak RF signal - which we assume to be of the order of microwatts-in the presence of high - power local RF interference. This local interference is a signal whose power is of the order of 100 W and is generated in close proximity to the receiver. We wish to emphasize that the nature of the interfering signal is completely known to us in practice, since we are generating it for communications purposes. This knowledge of the interfering signal will prove to be useful in our attempts to cancel it, as will be shown. We refer to this technique as optical interference cancellation, or opto-cancellation. We have demonstrated that this opto-cancellation system can cancel a simple sinusoid at 3 GHz, as well as broadband interference of approximately 100-MHz bandwidth centered at 3 GHz. We have also demonstrated cancellation of sinusoids and broadband signals at other center frequencies as well. In the case of sinusoidal signals, we have demonstrated optical cancellation over 70 dB; and in the case of the ∼100-MHz signal, we have demonstrated optical cancellation over 30 dB.
AB - In this paper, we describe a system for cancelling radio-frequency (RF) interference using optical techniques. Specifically, we attempt to receive a weak RF signal - which we assume to be of the order of microwatts-in the presence of high - power local RF interference. This local interference is a signal whose power is of the order of 100 W and is generated in close proximity to the receiver. We wish to emphasize that the nature of the interfering signal is completely known to us in practice, since we are generating it for communications purposes. This knowledge of the interfering signal will prove to be useful in our attempts to cancel it, as will be shown. We refer to this technique as optical interference cancellation, or opto-cancellation. We have demonstrated that this opto-cancellation system can cancel a simple sinusoid at 3 GHz, as well as broadband interference of approximately 100-MHz bandwidth centered at 3 GHz. We have also demonstrated cancellation of sinusoids and broadband signals at other center frequencies as well. In the case of sinusoidal signals, we have demonstrated optical cancellation over 70 dB; and in the case of the ∼100-MHz signal, we have demonstrated optical cancellation over 30 dB.
KW - Integrated electrooptic modulators
KW - Interference cancellation
KW - RF photonics
KW - Radio over fiber
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U2 - 10.1109/JQE.2009.2013106
DO - 10.1109/JQE.2009.2013106
M3 - Article
AN - SCOPUS:63649124965
SN - 0018-9197
VL - 45
SP - 402
EP - 408
JO - IEEE Journal of Quantum Electronics
JF - IEEE Journal of Quantum Electronics
IS - 4
ER -