微波光产生及滤波的若干光调控机制
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摘要
光网络与无线网络的融合主导现代通信网络技术向大容量、长距离传输的方向发展,Radio over Fiber技术(ROF,无线信号光纤传送)已成为这一前沿领域的热点研究课题,并推动微波技术和光子学融合的新兴交叉学科——微波光子学的迅速发展。用先进的微波光子学技术解决超宽带信息传送问题在无线通信、军事等领域有重要的应用前景而引起了世界各国的重视。本论文围绕微波光子学技术的若干关键功能的物理实现,研究相关的光学调控机制,主要包括微波毫米波的全光产生及微波光子滤波。
通过光纤激光器的锁模效应,采用单一商用调制器实现了高次谐波的产生;并利用二次谐波锁模和FBG滤波器相结合的方式实现了对多余谐波的滤除。利用在10GHz信号源和强度调制器,通过腔外滤波的谐波锁模和腔内滤波的注入锁模光纤激光器两种方法实现了四倍于调制器驱动频率的毫米波拍频光源;通过拍频产生了相位噪声<-66dBc/Hz@1kHz ,频率为40GHz的毫米波。
通过级联两个强度调制器实现了高次谐波的产生;利用调制器工作点的设置及对谐波光相移差的控制实现了对多余谐波的滤除。使用10GHz信号源、两个强度调制器和一段可调光延迟线,实现了四倍于调制器驱动频率的毫米波拍频光源;通过拍频产生了谐波抑制比大于20dB、相位噪声<-66dBc/Hz@1kHz ,频率为40GHz的毫米波。
通过级联调制产生了多个抽头,实现了等频率间隔抽头加色散媒质的微波光子滤波器,并通过调节调制器直流偏置、驱动频率以及谐波光相移,改变了抽头数目、频响曲线的形状以及自由谱区,对通过级联调制和光相移控制实现微波光子滤波器(MPF)的重构和调谐进行了论证;最后,利用光纤中的四波混频效应进一步增加了抽头数目,使MPF的Q值达到20。
利用光纤双折射效应实现两抽头负系数MPF,在此基础上通过强度调制增加抽头的数目,获得了带有负系数的四抽头和六抽头MPF。
The integration of optical network and wireless network develop the modern communications for the direction of large-capacity and long-distance. Radio over Fiber technology (ROF) has become a hot area of the cutting-edge research and promoted the rapid development of microwave photonics– the cross-disciplinary integration technology of microwave and photonics. The important application prospects for using advanced microwave photonics technology to solve the issue of ultra-wideband transmissions in wireless communications and military raises the prospect of great importance to all countries in the world. In this thesis, revolving around a number of key features of the physical realization in microwave photonics technology, we research related optical regulation and control mechanism, including the all-optical microwave/millimeter wave generation and microwave photonic filter.
Using harmonic wave mode-locked fiber and fiber Bragg filter grating, we achieve the two output harmonic wave with frequency interval of quadruple modulator driving frequency and realize the generation of millimeter wave by bearing frequency. Through two ways: second harmonic wave mode-locked and filter extra-cavity, injection second harmonic wave mode-locked and filter inner-cavity, we achieve 40GHz millimeter-wave by using a 10GHz signal generator with phase noise of <-66dBc/Hz @ 1kHz.
By introducing the optical phase shifting regulation and control mechanism in cascaded modulation, the optical carrier wave is suppressed; and combining with the regulation and control of two modulators, 2-order harmonic wave is generated and quadruple driving frequency of millimeter-wave is achieved. By using 10GHz signal generator, we achieve 40GHz millimeter-wave with phase noise of <-66dBc/Hz @ 1kHz and harmonic wave suppression ratio of >20dB.
Using cascaded modulation, a reconfigurable and tunable MPF is proposed, in which the sidebands generated by a CW light passing through two cascaded MZMs serve as the multi-taps and an optical variable delay line (VDL) between two modulators is introduced to add another way to adjust the tap weightings. The reconfigurability can be achieved by adjusting both the bias voltage, modulation depth of MZMs and the difference of optical phase shifting of every sideband. So a reconfigurable MPF can be realized with arbitrary filter responses. As examples, the response shape of uniform window and hanning window are experimentally demonstrated with five taps. In addition, the tunability of MPF can also be achieved by tuning the driving frequency of MZMs. Finally, the use of fiber-optic four-wave mixing effect for a further increase in the number of the tap so that the Q value of MPF reach 20.
The realization of negative coefficient taps by using birefringence effect combining with intensity modulation is also demonstrated. Through birefringence effect combining with intensity modulation, we achieved 4 and 6 tap with negative coefficient of MPF.
通过光纤激光器的锁模效应,采用单一商用调制器实现了高次谐波的产生;并利用二次谐波锁模和FBG滤波器相结合的方式实现了对多余谐波的滤除。利用在10GHz信号源和强度调制器,通过腔外滤波的谐波锁模和腔内滤波的注入锁模光纤激光器两种方法实现了四倍于调制器驱动频率的毫米波拍频光源;通过拍频产生了相位噪声<-66dBc/Hz@1kHz ,频率为40GHz的毫米波。
通过级联两个强度调制器实现了高次谐波的产生;利用调制器工作点的设置及对谐波光相移差的控制实现了对多余谐波的滤除。使用10GHz信号源、两个强度调制器和一段可调光延迟线,实现了四倍于调制器驱动频率的毫米波拍频光源;通过拍频产生了谐波抑制比大于20dB、相位噪声<-66dBc/Hz@1kHz ,频率为40GHz的毫米波。
通过级联调制产生了多个抽头,实现了等频率间隔抽头加色散媒质的微波光子滤波器,并通过调节调制器直流偏置、驱动频率以及谐波光相移,改变了抽头数目、频响曲线的形状以及自由谱区,对通过级联调制和光相移控制实现微波光子滤波器(MPF)的重构和调谐进行了论证;最后,利用光纤中的四波混频效应进一步增加了抽头数目,使MPF的Q值达到20。
利用光纤双折射效应实现两抽头负系数MPF,在此基础上通过强度调制增加抽头的数目,获得了带有负系数的四抽头和六抽头MPF。
The integration of optical network and wireless network develop the modern communications for the direction of large-capacity and long-distance. Radio over Fiber technology (ROF) has become a hot area of the cutting-edge research and promoted the rapid development of microwave photonics– the cross-disciplinary integration technology of microwave and photonics. The important application prospects for using advanced microwave photonics technology to solve the issue of ultra-wideband transmissions in wireless communications and military raises the prospect of great importance to all countries in the world. In this thesis, revolving around a number of key features of the physical realization in microwave photonics technology, we research related optical regulation and control mechanism, including the all-optical microwave/millimeter wave generation and microwave photonic filter.
Using harmonic wave mode-locked fiber and fiber Bragg filter grating, we achieve the two output harmonic wave with frequency interval of quadruple modulator driving frequency and realize the generation of millimeter wave by bearing frequency. Through two ways: second harmonic wave mode-locked and filter extra-cavity, injection second harmonic wave mode-locked and filter inner-cavity, we achieve 40GHz millimeter-wave by using a 10GHz signal generator with phase noise of <-66dBc/Hz @ 1kHz.
By introducing the optical phase shifting regulation and control mechanism in cascaded modulation, the optical carrier wave is suppressed; and combining with the regulation and control of two modulators, 2-order harmonic wave is generated and quadruple driving frequency of millimeter-wave is achieved. By using 10GHz signal generator, we achieve 40GHz millimeter-wave with phase noise of <-66dBc/Hz @ 1kHz and harmonic wave suppression ratio of >20dB.
Using cascaded modulation, a reconfigurable and tunable MPF is proposed, in which the sidebands generated by a CW light passing through two cascaded MZMs serve as the multi-taps and an optical variable delay line (VDL) between two modulators is introduced to add another way to adjust the tap weightings. The reconfigurability can be achieved by adjusting both the bias voltage, modulation depth of MZMs and the difference of optical phase shifting of every sideband. So a reconfigurable MPF can be realized with arbitrary filter responses. As examples, the response shape of uniform window and hanning window are experimentally demonstrated with five taps. In addition, the tunability of MPF can also be achieved by tuning the driving frequency of MZMs. Finally, the use of fiber-optic four-wave mixing effect for a further increase in the number of the tap so that the Q value of MPF reach 20.
The realization of negative coefficient taps by using birefringence effect combining with intensity modulation is also demonstrated. Through birefringence effect combining with intensity modulation, we achieved 4 and 6 tap with negative coefficient of MPF.
引文
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[2] Matsuda, T., Kotanigawa, T., Kataoka, T. and Naka, A., 53 × 42.7 Gbit/s L- and U-band WDM signal transmission experiments with in-line hybrid optical amplifiers, Electronics Letters, 2004, 40(6):380-381.
[3] Miyamoto, Y., Tomizawa, M. and Tada, Y., 43-Gbit/s-chennel-based DWDM System Technologies for the Photonic Transport Network, NTT Technical Review, 2003, 1(8):36-48.
[4]韦公远,光电子领跑21世纪,世界网络与多媒体,2001, 8.
[5]宋俊德、战晓苏,无线通信与网络,国防工业出版社, 2008
[6] Kagami, O., Toyoda, I. and Umehira, M., Technologies for next-generation wireless LANs, NTT Technical Review, 2005, 3(1):31-36.
[7] Nakajima, N., ROF technologies applied for cellular and wireless systems, Seoul, Korea, Republic of: Inst. of Elec. and Elec. Eng. Computer Society, 2005:11-14.
[8] Seeds, A. J., Microwave photonics, IEEE Transactions on Microwave Theory and Techniques, 2002, 50(3):877-887.
[9] Anne Vilcot, Béatrice Cabon, Jean Chazelas. Microwave photonics:from components to applications and systems, Netherlands: Kluwer Academic Publishers, 2003
[10] Garcia Zuazola, I. J., Elmirghani, J. M. H. and Batchelor, J. C., UWB RoF system for in-vehicle applications, Wroclaw, Poland: Inst. of Elec. and Elec. Eng. Computer Society, 2008.
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