| 基于级联调制器和四波混频效应的24倍频微波信号的光学生成 |
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| 引用本文： | 周威,邹喜华,潘炜,闫连山,罗斌,卢冰.基于级联调制器和四波混频效应的24倍频微波信号的光学生成[J].光电子．激光,2013(12):2332-2337. |
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| 作者姓名： | 周威 邹喜华 潘炜 闫连山 罗斌 卢冰 |
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| 作者单位： | 西南交通大学 信息与科学技术学院,信息光子与通信研究中心,四川 成都 610031;西南交通大学 信息与科学技术学院,信息光子与通信研究中心,四川 成都 610031;西南交通大学 信息与科学技术学院,信息光子与通信研究中心,四川 成都 610031;西南交通大学 信息与科学技术学院,信息光子与通信研究中心,四川 成都 610031;西南交通大学 信息与科学技术学院,信息光子与通信研究中心,四川 成都 610031;西南交通大学 信息与科学技术学院,信息光子与通信研究中心,四川 成都 610031 |
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| 基金项目： | 国家自然科学基金(61378008)、教育部新世纪优秀人才基金(NCET-12-0940)和高校博士点 基金(20110184130003、20100184120007)资助项目 (西南交通大学 信息与科学技术学院,信息光子与通信研究中心,四川 成都 610031) |
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| 摘 要： | 提出了一种基于级联马赫-曾德尔调制器 (MZM)和半导体光放大器(SOA)的24倍频微波信号 光学生成方案,具有覆盖频段高、杂波抑制效果好等优点。在本方案中,低频微波信号分别 通过两个级联 MZM对连续光源进行调制,调节直流偏置使两个MZM均工作在最大偏置点,以抑制奇数阶光分 量；进一 步调节两个MZM的调制深度,并结合可调谐电相移器(TEPS)和可调谐光相移器(TOPS)引入相 移,完全抑 制第2个MZM输出的±2阶光分量和光载波,得到±4阶光分量；再经过SOA发生四波混频(FWM )效应,形成±12 阶光分量；滤波后拍频可以获得24倍频微波信号。最后,搭建了实验和仿真系统,分别以11．0GHz,11.5GHz和12.0GHz的微波信号为驱动,得到间隔为264、276GH z和288GHz的±12阶光边带,有效验证了方案的可行性。
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| 关 键 词： | 微波信号生成 24倍频 马赫-曾德尔调制器(MZM) 半导体光放 大器(SOA) 四波混频(FWM) |
| 收稿时间： | 2013/4/27 0:00:00 |
Photonic generation of microwave signals with a 24multiplied frequency using cascaded Mach-Zehnder modulators and four-wave mixing |
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| Affiliation: | Center for Information Photonics and Communications,School of Information Scie nce and Technology,Southwest Jiaotong University,Chengdu 610031,China;Center for Information Photonics and Communications,School of Information Scie nce and Technology,Southwest Jiaotong University,Chengdu 610031,China;Center for Information Photonics and Communications,School of Information Scie nce and Technology,Southwest Jiaotong University,Chengdu 610031,China;Center for Information Photonics and Communications,School of Information Scie nce and Technology,Southwest Jiaotong University,Chengdu 610031,China;Center for Information Photonics and Communications,School of Information Scie nce and Technology,Southwest Jiaotong University,Chengdu 610031,China;Center for Information Photonics and Communications,School of Information Scie nce and Technology,Southwest Jiaotong University,Chengdu 610031,China |
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| Abstract: | A photonic approach using two cascaded Mach-Zehnder modulators (MZMs) and a semiconductor optical amplifier (SOA) is proposed to generate microwave signals with a f requency 24times of that of the low-frequency seed signal,with the advantages of wide frequency coverage and e xcellent clutter suppression.In the proposed system,a low-frequency seed signal is applied to modulate the lig htwave from a laser source in the two cascaded MZMs which are biased at the maximum transmission point (MATP) via adjusting the dc bias to suppress the odd-order sidebands.Then the ±2nd sidebands and the optical carr ier at the output of the second MZM will be eliminated by properly adjusting the modulation indices of the two M ZMs as well as the phase shifts introdued by the tunable electrical phase shifter (TEPS) and the tunable optical phase shifter (TOPS),resulting in the generation of the ±4th sidebands.The ±4th sidebands are then injected int o the SOA to be two pump waves, so that two idle waves (i.e.,±12th sidebands) would be generated due to the four wave mixing (FWM) effect.The ±12th sidebands are selected by using an opti cal filter and sent to a high-speed photodetecor.As a result,a microwave signal with a frequency 24times of that of the low-frequency seed si gnal is achieved.Finally, experiment and simulation are performed to verify the feasibility of the approac h.When the frequency of the microwave driving signal is tuned from 11GHz to 12GHz with an interval of 0.5GHz,the spacing of the generated ±12th sidebands is achieved from 264GHz to 288GHz. |
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| Keywords: | microwave signal generation 24multiplied frequency Mach -Zehnder modulator(MZM) semiconductor optical amplifier(SOA) four-wave mixin g (FWM) |
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