Frequency-Oriented Subsampling by Photonic Fourier Transform and I/Q Demodulation
Subsampling can directly acquire a passband within a broad radio frequency (RF) range, avoiding down-conversion and low-phase-noise tunable local oscillation. However, subsampling suffers from band folding and self-image interference. In this paper, we propose a frequency-oriented subsampling to sol...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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IEEE
2017-01-01
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| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/8115126/ |
| _version_ | 1819168309556281344 |
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| author | Wenhui Hao Yitang Dai Feifei Yin Yue Zhou Jianqiang Li Jian Dai Wangzhe Li Kun Xu |
| author_facet | Wenhui Hao Yitang Dai Feifei Yin Yue Zhou Jianqiang Li Jian Dai Wangzhe Li Kun Xu |
| author_sort | Wenhui Hao |
| collection | DOAJ |
| description | Subsampling can directly acquire a passband within a broad radio frequency (RF) range, avoiding down-conversion and low-phase-noise tunable local oscillation. However, subsampling suffers from band folding and self-image interference. In this paper, we propose a frequency-oriented subsampling to solve those two problems. With ultrashort optical pulse and a pair of chromatic dispersions, the broadband RF signal is first short-time Fourier-transformed to a spectrum-spread pulse. Then, a time slot, corresponding to the target spectrum slice, is coherently optical-sampled by in-phase/quadrature (I/Q) demodulation. We demonstrate the novel bandpass sampling by a numerical example, which shows the desired uneven intensity response, i.e., prefiltering, to avoid the band folding. We show in theory that appropriate time-stretch capacity from dispersion can result in prefiltering bandwidth less than sampling rate. Image rejection due to I/Q sampling is also analyzed. A proof-of-concept experiment, which is based on a time-lens sampling source and chirped fiber Bragg gratings, shows the center-frequency-tunable prefiltered subsampling with bandwidth of 6 GHz around, as well as imaging rejection larger than 26 dB. Our technique may benefit future broadband RF receivers for frequency-agile Radar or channelization. |
| first_indexed | 2024-12-22T19:01:34Z |
| format | Article |
| id | doaj.art-1a73aeaf529945b88c401c24aa6ecfd9 |
| institution | Directory Open Access Journal |
| issn | 1943-0655 |
| language | English |
| last_indexed | 2024-12-22T19:01:34Z |
| publishDate | 2017-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj.art-1a73aeaf529945b88c401c24aa6ecfd92022-12-21T18:15:55ZengIEEEIEEE Photonics Journal1943-06552017-01-01961810.1109/JPHOT.2017.27756538115126Frequency-Oriented Subsampling by Photonic Fourier Transform and I/Q DemodulationWenhui Hao0Yitang Dai1https://orcid.org/0000-0002-3758-1342Feifei Yin2Yue Zhou3Jianqiang Li4https://orcid.org/0000-0002-1646-434XJian Dai5Wangzhe Li6Kun Xu7https://orcid.org/0000-0002-1663-9998State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, ChinaState Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, ChinaState Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, ChinaState Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, ChinaState Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, ChinaState Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, ChinaNational Key Lab of Microwave Imaging Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing, ChinaState Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, ChinaSubsampling can directly acquire a passband within a broad radio frequency (RF) range, avoiding down-conversion and low-phase-noise tunable local oscillation. However, subsampling suffers from band folding and self-image interference. In this paper, we propose a frequency-oriented subsampling to solve those two problems. With ultrashort optical pulse and a pair of chromatic dispersions, the broadband RF signal is first short-time Fourier-transformed to a spectrum-spread pulse. Then, a time slot, corresponding to the target spectrum slice, is coherently optical-sampled by in-phase/quadrature (I/Q) demodulation. We demonstrate the novel bandpass sampling by a numerical example, which shows the desired uneven intensity response, i.e., prefiltering, to avoid the band folding. We show in theory that appropriate time-stretch capacity from dispersion can result in prefiltering bandwidth less than sampling rate. Image rejection due to I/Q sampling is also analyzed. A proof-of-concept experiment, which is based on a time-lens sampling source and chirped fiber Bragg gratings, shows the center-frequency-tunable prefiltered subsampling with bandwidth of 6 GHz around, as well as imaging rejection larger than 26 dB. Our technique may benefit future broadband RF receivers for frequency-agile Radar or channelization.https://ieeexplore.ieee.org/document/8115126/Microwave photonicssub-samplingdispersionreal-time Fourier transformI/Q demodulation |
| spellingShingle | Wenhui Hao Yitang Dai Feifei Yin Yue Zhou Jianqiang Li Jian Dai Wangzhe Li Kun Xu Frequency-Oriented Subsampling by Photonic Fourier Transform and I/Q Demodulation IEEE Photonics Journal Microwave photonics sub-sampling dispersion real-time Fourier transform I/Q demodulation |
| title | Frequency-Oriented Subsampling by Photonic Fourier Transform and I/Q Demodulation |
| title_full | Frequency-Oriented Subsampling by Photonic Fourier Transform and I/Q Demodulation |
| title_fullStr | Frequency-Oriented Subsampling by Photonic Fourier Transform and I/Q Demodulation |
| title_full_unstemmed | Frequency-Oriented Subsampling by Photonic Fourier Transform and I/Q Demodulation |
| title_short | Frequency-Oriented Subsampling by Photonic Fourier Transform and I/Q Demodulation |
| title_sort | frequency oriented subsampling by photonic fourier transform and i x002f q demodulation |
| topic | Microwave photonics sub-sampling dispersion real-time Fourier transform I/Q demodulation |
| url | https://ieeexplore.ieee.org/document/8115126/ |
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