We propose and demonstrate a multifrequency radio frequency (RF) spectrum estimation technology. With photonic assistance, a multifrequency RF signal ranging from 0 to 1 GHz is highly spectrally compressed and sensed using a single analog-to-digital converter with analog bandwidth of 42.6 MHz. By calculating the cross correlation of pseudo random binary sequence and the encoded signal, up to 40 RF tones are precisely recognized without large computational load. The employment of optical mixing decreased the cost and increased the performance compared to its electrical counterpart. The theory and performance are also discussed.
© 2013 Optical Society of America
Original Manuscript: June 26, 2013
Manuscript Accepted: September 21, 2013
Published: October 24, 2013
Feifei Yin, Yuyang Gao, Yitang Dai, Junyi Zhang, Kun Xu, Ziping Zhang, Jianqiang Li, and Jintong Lin, "Multifrequency radio frequency sensing with photonics-assisted spectrum compression," Opt. Lett. 38, 4386-4388 (2013)