Broadband Photonic RF Channelization Based on Coherent Optical Frequency Combs and I/Q Demodulators

By Xiaojun Xie, Yitang Dai, Kun Xu, J. Niu, Ruixin Wang, Li Yan, Jintong Lin. IEEE Photonics Journal, 2012

150 citations recorded by the source corpus.

In this paper, a novel photonic-assisted broadband and high-resolution radio-frequency (RF) channelization scheme based on dual coherent optical frequency combs (OFCs), regular optical de-muxes, and I/Q demodulators is analyzed and experimentally demonstrated. The use of two coherent combs avoids precise optical alignment, and a numerical filter in digital signal processor (DSP) enables an ideal rectangular frequency response in each channel without any ultranarrow optical filters. Besides, due to the use of I/Q demodulators, ambiguous frequency estimate in direct detection is avoided. By using two coherent OFCs with the free spectrum range (FSR) of about 40 GHz, we experimentally demonstrate the channelization scheme with seven channels, 500-MHz channel spacing, and frequency coverage from 3.75 to 7.25 GHz. The input RF tones are accurately downconverted to an intermediate frequency (IF) with a maximum frequency error of 125 kHz. Meanwhile, the channel frequency response and crosstalk of the scheme are also evaluated experimentally.

Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/fb45827aaa25bcded3f34c6287d4c4a91224abaf

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In Atomic and Molecular Physics, and Optics

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Citations in the corpus

Broadband Photonic RF Channelizer With 92 Channels Based on a Soliton Crystal Microcomb (2020, background): “frequency combs [11], [23], [24], and others [25], [26].”
Broadband RF Channelizer Based on an Integrated Optical Frequency Kerr Comb Source (2018, background): “Recent advances in dual-comb spectroscopy provide new possibilities for that [23], [51]–[53].”
Photonics for microwave measurements (2016, methodology): “To enhance the channel resolution, from a few gigahertz to tens of megahertz or even tens of kilohertz, channelizers based on an OFC in conjunction with an inphase and quadrature (IQ) demodulator [95] or an SBS processing unit [96, 97], have been proposed.”