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Frequency up-converter as an essential component of the transmitter, which is used to implement the frequency up-conversion by mixing a low-frequency intermediate frequency (IF) signal with a local oscillator (LO) signal. However, only the 1st-order sideband of the LO signal and the IF signal are used in the tradtioanal microwave photonic up-converser, thus the frequency of the up-conversion signal is ωLO + ωIF. In this case, an LO with a higher frequency is needed for generating a high-frequency up-converted signal. In order to reduce the frequency requirement of the LO signal, the high-order LO singals or secondary modulation can be used to achieve high-frequency up-conversion. A microwave photonic up-converter with LO doubling based on carrier suppressing single-sideband modulation is proposed based on the cascaded structure of a Mach-Zehnder modulator (MZM) and a dual-parallel Mach-Zehnder modulator (DPMZM). The MZM is driven by an LO signal biased at the minimum transmission point for carrier suppressing double-sideband (CS-DSB) modulation. A fiber Bragg grating (FBG) is used to separate the +1st-order from －1st-order of the LO signal. The －1st-order of LO signal is then sent to a DPMZM for the secondary modulation, and the carrier suppressing single-sideband (CS-SSB) modulation is realized in order to generate the －1st-order of the IF signal by using an electrical 90° hybrid coupler. The modulated IF signal is then combined with the +1st-order LO signal reflected by the FBG and sent into the photodetector (PD) to implement the photoelectric detection. The upconverted signal with a frequency of 2ωLO + ωIF can be detected by a PD. The experimental results show that the spur suppression ratio of the optical spectrum and the up-converter signal reach 22.5 dB and 23.6 dB, respectively. The spurious-free dynamic range of the system is 96.1 dB·Hz2/3. The proposed system can effectively reduce the frequency requirement of LO signal, and the purity of the electrical spectrum is largely improved which benefits from the CS-SSB modulation. The proposed microwave photonic up-converter provides an effective way for high-frequency emissions in systems such as radio-over-fiber and optically controlled phased array radar.
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Keywords:
- microwave photonics /
- frequency up-converter /
- carrier-suppressed single-sideband modulation
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图 1 微波光子本振倍频上变频系统结构图
Figure 1. Schematic diagram of proposed frequency-doubling microwave photonic up-converter.
图 2 系统中相应位置的光谱和频谱图
Figure 2. Corresponding optical and electrical spectrums at different locations in Fig. 1.
图 3 实验搭建的系统链路图
Figure 3. Experimental setup of the proposed frequency-doubling microwave photonic up-converter.
图 4 实验链路中的各点光谱图 (a) MZM的输出光谱; (b) FBG的透射光谱; (c) FBG的反射光谱; (d) DPMZM的输出光谱; (e) DPMZM与FBG的反射谱合路后的光谱
Figure 4. Measured optical spectrums of the proposed up-conversion link. The spectrums of (a) output of MZM; (b) transmission through FBG; (c) reflection by FBG; (d) output of DPMZM (e) combined signal from DPMZM and FBG.
图 5 实验链路得到的上转换频谱图
Figure 5. The electrical spectrum of the proposed microwave frequency up-converter.
图 6 系统转换效率 (a) LO频率固定, IF频率变化; (b) IF频率固定, LO频率变化
Figure 6. Measured conversion efficiency when (a) LO is fixed and IF changes and (b) IF is fixed and LO changes.
图 7 测得系统的误差矢量幅度
Figure 7. Measured EVM of the generated up-conversion signal.
图 8 系统的无杂散动态范围
Figure 8. SFDR of the proposed microwave photonic up-converter.
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[1] Ghelfi P, Laghezza F, Scotti F, Serafino G, Capria A, Pinna S, Onori D, Porzi C, Scaffardi M, Malacarne A, Vercesi V, Lazzeri E, Berizzi F, Bogoni A 2014 Nature 507 341
Google Scholar
[2] Minasian R A, Chan E H W, Yi X 2013 Opt. Exp. 21 22918
Google Scholar
[3] Capmany J, Novak D 2007 Nat. Photon. 1 319
Google Scholar
[4] Yang X W, Xu K, Yin J, Dai Y T, Yin F F, Li J Q, Lu H, Liu T, Ji Y F 2014 Opt. Exp. 22 869
Google Scholar
[5] Gopalakrishnan G K, Burns W K, Bulmer C H 1993 IEEE Trans. Microw. Theory Tech. 41 2383
Google Scholar
[6] Altaqui A, Chan E H W, Minasian R A 2014 Appl. Opt. 53 3687
Google Scholar
[7] Zhang W, Wen A J, Gao Y S, Li X Y, Shang S 2016 IEEE Photon. J. 8 5500909
[8] Li T, Chan E H W, Wang X D, Feng X H, Guan B O, Yao J P 2018 IEEE Photon. J. 10 5500112
[9] 王云新, 李虹历, 王大勇, 李静楠, 钟欣, 周涛, 杨登才, 戎路 2017 66 098401
Google Scholar
Wang Y X, Li H L, Wang D Y, Li J N, Zhong X, Zhou T, Yang D C, Rong L 2017 Acta Phys. Sin. 66 098401
Google Scholar
[10] Tang Z Z, Pan S L 2017 Opt. Lett. 42 33
Google Scholar
[11] Gao Y S, Wen A J, Zhang W, Wang Y, Zhang H X 2017 J. Lightwave Technol. 35 1566
Google Scholar
[12] Zhu S, Shi Z, Li M, Zhu N H, Li W 2018 Opt. Lett. 43 583
Google Scholar
[13] 100G/400G LN Modulator data sheet, Fujitsu http://www. fujitsu.com/jp/group/foc/en/products/optical-devices/100gln/ [2019-2-26]
[14] Gao Y S, Wen A J, Zhang H X, Xiang S Y, Zhang H Q, Zhao L J, Shang L 2014 Opt. Commun. 321 11
Google Scholar
[15] Yin C J, Li J Q, Li B Y, Lü Q, Dai J, Yin F F, Dai Y T, Xu K 2017 IEEE Photon. J. 9 5502307
[16] Chi H, Yao J P 2008 J. Lightwave Technol. 26 2706
Google Scholar
[17] Tang Z Z, Pan S L 2016 IEEE Trans. Microw. Theory Tech. 64 3017
Google Scholar
[18] Zhu D, Pan S L 2018 Photonics 5 6
Google Scholar
[19] Xu J H, Wang Y X, Zhou T, Wang D Y, Li J N, Zhong X, Yang D C 2017 Applied Optics and Photonics China (AOPC)
201 7 [20] Tang Z Z, Pan S L 2016 IEEE Microw. Wirel. Co. 26 67
Google Scholar
[21] Zhang J L, Chan E H W, Wang X D, Feng X H, Guan B 2017 IEEE Photon. J. 9 5501910
[22] Hraimel B, Zhang X P, Pei Y Q, Wu K, Liu T J, Xu T F, Nie Q H 2011 J. Lightwave Technol. 29 775
Google Scholar
[23] Kim H, Song H, Song J 2009 IEEE Photon. Tech. L. 21 1329
Google Scholar
[24] Pan H, Segami M, Choi M, Cao L, Abidi A 2000 IEEE J. Solid-St. Circ. 35 1769
Google Scholar
[25] Li W, Huang Y, Hong Z 2010 Electron. Lett. 46 1187
Google Scholar
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