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With the development of wireless communication technology and micro-cell technology, optical-borne microwave technology, specially optical-borne multi-carrier technology has become one of the most important trends for generating high-quality sources. Therefore, the efficient generation of high-quality microwave signals has always been a requirement in wireless communication systems. Due to its low-noise and high-frequency output characteristics, photoelectric oscillator is widely used to generate high-quality microwave frequency sources in communication systems. Combining the advantages of photoelectric oscillator's low-noise output and direct-modulated laser's gain-switching state characteristics, a tunable optical-borne microwave frequency comb scheme based on dual-loop mixing-frequency photoelectric oscillator is proposed in this paper. And a direct-modulated laser operating in a gain-switching state is used to generate the original optical-borne microwave frequency comb signals. The dual-loop adjacent resonant frequencies are separated by two different high-frequency microwave bandpass filters. The beat frequency of adjacent frequencies mentioned above is injected back into laser to form photoelectric resonance, and thus enhancing the generated original optical-borne microwave frequency comb signals. To suppress the side modes caused by long resonant cavity, a polarized dual-loop structure is used in the system, and thus improving the noise characteristics of output signals. After experimental analysis, the dual-loop filtered resonant microwave signals and low-phase-noise microwave comb signals with a frequency interval of 797.4 MHz are all obtained. The microwave output side-mode suppression ratio after polarized dual-loop adjustment is improved to 47 dB. And microwave comb signal's first-order carrier phase noise is lower than-101.7 dBc/Hz at 10 kHz,-115.2 dBc/Hz at 50 kHz. In addition, higher-order carriers all come from the light multiplication of first-order carrier, they share the same low noise characteristics with first-order microwave comb signal. The output power of first-to-fourth, fifth-to-thirteenth order carriers are balanced to 10 dB by photoelectric resonance injection. And their side-mode suppression ratios are all better than 40 dB. Furthermore, theoretically, the comb interval can be adjusted to any frequencies by changing the center frequencies of two high-frequency bandpass microwave filters. Therefore, optical-borne multi-carrier microwave signals are generated efficiently and cost-effectively by this tunable optical-borne microwave frequency comb scheme, and the generated low-noise multi-carrier frequency sources meet the demand of an optical-borne microwave wireless communication system.
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Keywords:
- photo-generated microwave comb /
- optoelectronic oscillator /
- directly modulated laser /
- multiple-frequency filtering
[1] Ma J, Li Y 2015 Opt. Commun. 334 22
[2] Li C Y, Su H S, Chang C H, Lu H H, Wu P Y, Chen C Y, Ying C L 2012 J. Lightwave Technol. 30 298
[3] Zhang L, Hu X, Cao P, Wang T, Su Y 2011 Opt. Express 19 5196
[4] Chowdhury A, Chan G K, Chien H C, Yu J, Hsueh Y T 2010 J. Lightwave Technol. 28 2230
[5] Hagmann M J, Efimov A, Taylor A J, Yarotski D A 2011 Appl. Phys. Lett. 99 011112
[6] Hagmann M J, Taylor A J, Yarotski D A 2012 Appl. Phys. Lett. 101 241102
[7] Hagmann M J, Stenger F S, Yarotski D A 2013 J. Appl. Phys. 114 223107
[8] Weiner A M, Long C M, Leaird D E, Wu R, Supradeepa V R 2010 Opt. Lett. 35 3234
[9] Wong J H, Lam H Q, Aditya S, Zhou J Q, Li N X, Xue J, Lim P H, Lee K K, Wu K, Shum P P 2012 J. Lightwave Technol. 30 3164
[10] Shang L, Wen A, Lin G B 2014 J. Opt. 16 035401
[11] Wang W T, Liu J G, Sun W H, Chen W 2015 Opt. Commun. 338 90
[12] Chan S C, Xia G Q, Liu J M 2007 Opt. Lett. 32 1917
[13] Juan Y S, Lin F Y 2009 Opt. Express 17 18596
[14] Fan L, Xia G Q, Tang X, Deng T, Chen J J, Lin X D, Li Y N, Wu Z M 2017 IEEE Access 5 17764
[15] Jiang Y, Bai G, Hu L, Li H, Zhou Z, Xu J, Wang S 2013 IEEE Photonic Tech. L. 25 382
[16] Izutsu M, Sakamoto T, Kawanishi T 2006 Opt. Lett. 31 811
[17] Buldu J M, Garcia-Ojalvo J, Torrent M C 2004 IEEE J. Quantum. Elect. 40 640
[18] Jiang Y, Zi Y J, Bai G F, Tian J 2018 Opt. Lett. 43 1774
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[1] Ma J, Li Y 2015 Opt. Commun. 334 22
[2] Li C Y, Su H S, Chang C H, Lu H H, Wu P Y, Chen C Y, Ying C L 2012 J. Lightwave Technol. 30 298
[3] Zhang L, Hu X, Cao P, Wang T, Su Y 2011 Opt. Express 19 5196
[4] Chowdhury A, Chan G K, Chien H C, Yu J, Hsueh Y T 2010 J. Lightwave Technol. 28 2230
[5] Hagmann M J, Efimov A, Taylor A J, Yarotski D A 2011 Appl. Phys. Lett. 99 011112
[6] Hagmann M J, Taylor A J, Yarotski D A 2012 Appl. Phys. Lett. 101 241102
[7] Hagmann M J, Stenger F S, Yarotski D A 2013 J. Appl. Phys. 114 223107
[8] Weiner A M, Long C M, Leaird D E, Wu R, Supradeepa V R 2010 Opt. Lett. 35 3234
[9] Wong J H, Lam H Q, Aditya S, Zhou J Q, Li N X, Xue J, Lim P H, Lee K K, Wu K, Shum P P 2012 J. Lightwave Technol. 30 3164
[10] Shang L, Wen A, Lin G B 2014 J. Opt. 16 035401
[11] Wang W T, Liu J G, Sun W H, Chen W 2015 Opt. Commun. 338 90
[12] Chan S C, Xia G Q, Liu J M 2007 Opt. Lett. 32 1917
[13] Juan Y S, Lin F Y 2009 Opt. Express 17 18596
[14] Fan L, Xia G Q, Tang X, Deng T, Chen J J, Lin X D, Li Y N, Wu Z M 2017 IEEE Access 5 17764
[15] Jiang Y, Bai G, Hu L, Li H, Zhou Z, Xu J, Wang S 2013 IEEE Photonic Tech. L. 25 382
[16] Izutsu M, Sakamoto T, Kawanishi T 2006 Opt. Lett. 31 811
[17] Buldu J M, Garcia-Ojalvo J, Torrent M C 2004 IEEE J. Quantum. Elect. 40 640
[18] Jiang Y, Zi Y J, Bai G F, Tian J 2018 Opt. Lett. 43 1774
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