宽带大动态模拟光链路性能分析与关键技术研究
发布时间：2018-07-29 08:24
【摘要】：模拟光链路具有低噪声、低损耗、高带宽和大动态范围等优势,已成为当前微波光子领域研究的热点,并在民用通信、雷达、电子对抗、射电天文和航空航天等领域具有重要的应用价值。论文针对模拟光链路信号传输与探测过程中传输距离、传输带宽和动态范围受限等问题开展了深入的研究,提出了有效的解决方案,实现了微波信号长距离、宽带和大动态范围的光纤传输与感知,论文主要的创新工作如下： 1.针对光纤链路色度色散引起信号的周期性功率衰落、从而导致传输距离受限的问题,论文提出了一种基于并行强度与相位调制器的信号调制技术。通过利用两种调制格式信号的互补频率响应,使得接收射频信号的功率具有频率不敏感特性,从而功率的衰落得到补偿。实验实现了0-18GHz频率范围射频信号34km长距离光纤传输,系统频率响应平坦,功率抖动小于3dB,满足光载宽带射频信号的长距离传输的要求。 2.针对超宽带模拟光链路多倍频程受限的问题,论文提出了一种基于双输出马赫增德尔调制器与偏振复用的二阶谐波失真抑制技术。实验实现了35.8dB的二阶谐波失真抑制,同时二阶无杂散动态范围(SFDR2)提升了约18dB。该方法消除了宽频带射频光传输过程中高频成分受到的谐波失真干扰,从而能够实现宽带射频信号的正确解调。 3.针对模拟光链路非线性失真导致的SFDR受限问题,论文分别从全光失真预补偿及数字失真后补偿两方面开展了非线性失真抑制与动态范围提升的研究工作。 (1)论文提出了一种基于载波带处理的全光预失真方法。该方法通过对载波带相位进行独立的控制,使得三个主要来源下的三阶交调失真(IMD3)分量相互抵消,达到了IMD3抑制的目的。实验实现了高达34dB的失真抑制。该方法适于高频信号的线性解调,且结构简单,易于实现,大大降低了对接收机及后续处理的要求。 (2)在数字失真后补偿技术研究方面,论文结合低偏置技术的优势,提出了一种基于调制器工作点以及基带信息提取的数字信号处理(DSP)线性化方法。该方法克服了传统数字处理技术需精确获知系统传递函数的不足,从而使得数字失真补偿算法更加灵活。同时该技术适用于超宽带多射频载波模拟光链路中载波间互调失真与交调失真的共同抑制。 在此基础上,论文实现了模拟光链路中调制非线性失真以及前置、后置放大器失真的综合DSP补偿。既充分利用了微波辅助器件改善模拟光链路增益及噪声系数的优势,又消除了在动态范围提升方面所带来的瓶颈,从而实现模拟光链路中多个特征参数共同优化。系统实现了27.5dB增益,8.9dB噪声指数以及128.3dB@1Hz无杂散动态范围的高性能模拟光传输。相比国际公开报导指标,采用该技术获得的性能参数已达到国际先进水平。
[Abstract]:Analog optical link has the advantages of low noise, low loss, high bandwidth and large dynamic range. It has become a hot spot in the field of microwave photons, and has been used in civil communication, radar, electronic countermeasures, etc. Radio astronomy, aerospace and other fields have important application value. In this paper, the transmission distance, bandwidth and dynamic range of analog optical link signal transmission and detection are deeply studied, and an effective solution is put forward to realize the long distance of microwave signal. Broadband and large dynamic range of optical fiber transmission and perception, the main innovative work of the paper as follows: 1. Aiming at the problem of periodic power fading caused by chrominance dispersion in optical fiber link and the limitation of transmission distance, a signal modulation technique based on parallel intensity and phase modulator is proposed in this paper. By using the complementary frequency response of the two modulation formats, the power of the received RF signal is frequency insensitive and the power fading is compensated. The 0-18GHz frequency range RF signal 34km long distance optical fiber transmission is realized experimentally. The system frequency response is flat and the power jitter is less than 3 dB, which meets the requirements of optical broadband radio frequency signal long distance transmission. 2. In order to solve the problem of multi-octave path limitation in UWB analog optical links, a second-order harmonic distortion suppression technique based on dual-output Mahzhendel modulator and polarization multiplexing is proposed in this paper. The second order harmonic distortion suppression of 35.8dB is realized experimentally, and the second order spurious dynamic range (SFDR2) is improved by about 18 dB. The method eliminates the harmonic distortion interference of the high frequency component in the wide band RF optical transmission process, and can realize the correct demodulation of the broadband radio frequency signal. Aiming at the problem of SFDR limitation caused by nonlinear distortion in analog optical link, In this paper, nonlinear distortion suppression and dynamic range enhancement are studied from two aspects: all-optical distortion precompensation and digital distortion post-compensation. (1) an all-optical pre-distortion method based on carrier band processing is proposed in this paper. By independent control of the carrier band phase, the third order Intermodulation distortion (IMD3) components of the three main sources can cancel each other, thus achieving the purpose of IMD3 suppression. The distortion suppression up to 34dB is realized experimentally. This method is suitable for linear demodulation of high frequency signals, and its structure is simple and easy to realize, which greatly reduces the requirements for receiver and subsequent processing. (2) in the research of digital distortion compensation technology, this paper combines the advantages of low bias technology. A linearization method of digital signal processing (DSP) based on modulator operating point and baseband information extraction is proposed. This method overcomes the shortcoming that traditional digital processing technology needs to accurately know the system transfer function, which makes the digital distortion compensation algorithm more flexible. At the same time, this technique is suitable for the suppression of intercarrier Intermodulation distortion and Intermodulation distortion in UWB multi-RF carrier analog optical link. On this basis, the thesis realizes the synthesis DSP compensation of modulation nonlinear distortion and pre- and post-amplifier distortion in analog optical link. It not only makes full use of the advantages of microwave auxiliary device to improve the gain and noise coefficient of analog optical link, but also eliminates the bottleneck caused by dynamic range lifting, thus realizing the common optimization of many characteristic parameters in analog optical link. The high performance analog optical transmission with 27.5dB gain of 8.9 dB noise index and 128.3dB@1Hz with no spurious dynamic range is realized. Compared with the international public reporting index, the performance parameters obtained by this technology have reached the international advanced level.
【学位授予单位】：北京邮电大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN929.1
本文编号：2152081
[Abstract]:Analog optical link has the advantages of low noise, low loss, high bandwidth and large dynamic range. It has become a hot spot in the field of microwave photons, and has been used in civil communication, radar, electronic countermeasures, etc. Radio astronomy, aerospace and other fields have important application value. In this paper, the transmission distance, bandwidth and dynamic range of analog optical link signal transmission and detection are deeply studied, and an effective solution is put forward to realize the long distance of microwave signal. Broadband and large dynamic range of optical fiber transmission and perception, the main innovative work of the paper as follows: 1. Aiming at the problem of periodic power fading caused by chrominance dispersion in optical fiber link and the limitation of transmission distance, a signal modulation technique based on parallel intensity and phase modulator is proposed in this paper. By using the complementary frequency response of the two modulation formats, the power of the received RF signal is frequency insensitive and the power fading is compensated. The 0-18GHz frequency range RF signal 34km long distance optical fiber transmission is realized experimentally. The system frequency response is flat and the power jitter is less than 3 dB, which meets the requirements of optical broadband radio frequency signal long distance transmission. 2. In order to solve the problem of multi-octave path limitation in UWB analog optical links, a second-order harmonic distortion suppression technique based on dual-output Mahzhendel modulator and polarization multiplexing is proposed in this paper. The second order harmonic distortion suppression of 35.8dB is realized experimentally, and the second order spurious dynamic range (SFDR2) is improved by about 18 dB. The method eliminates the harmonic distortion interference of the high frequency component in the wide band RF optical transmission process, and can realize the correct demodulation of the broadband radio frequency signal. Aiming at the problem of SFDR limitation caused by nonlinear distortion in analog optical link, In this paper, nonlinear distortion suppression and dynamic range enhancement are studied from two aspects: all-optical distortion precompensation and digital distortion post-compensation. (1) an all-optical pre-distortion method based on carrier band processing is proposed in this paper. By independent control of the carrier band phase, the third order Intermodulation distortion (IMD3) components of the three main sources can cancel each other, thus achieving the purpose of IMD3 suppression. The distortion suppression up to 34dB is realized experimentally. This method is suitable for linear demodulation of high frequency signals, and its structure is simple and easy to realize, which greatly reduces the requirements for receiver and subsequent processing. (2) in the research of digital distortion compensation technology, this paper combines the advantages of low bias technology. A linearization method of digital signal processing (DSP) based on modulator operating point and baseband information extraction is proposed. This method overcomes the shortcoming that traditional digital processing technology needs to accurately know the system transfer function, which makes the digital distortion compensation algorithm more flexible. At the same time, this technique is suitable for the suppression of intercarrier Intermodulation distortion and Intermodulation distortion in UWB multi-RF carrier analog optical link. On this basis, the thesis realizes the synthesis DSP compensation of modulation nonlinear distortion and pre- and post-amplifier distortion in analog optical link. It not only makes full use of the advantages of microwave auxiliary device to improve the gain and noise coefficient of analog optical link, but also eliminates the bottleneck caused by dynamic range lifting, thus realizing the common optimization of many characteristic parameters in analog optical link. The high performance analog optical transmission with 27.5dB gain of 8.9 dB noise index and 128.3dB@1Hz with no spurious dynamic range is realized. Compared with the international public reporting index, the performance parameters obtained by this technology have reached the international advanced level.
【学位授予单位】：北京邮电大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN929.1
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