基于相位调制的可调谐微波光子滤波器研究

发布时间：2018-06-01 05:16

本文选题：可调谐 + 陷波　；参考：《天津理工大学》2017年硕士论文

【摘要】：微波光子滤波器作为微波光子学的一个重要研究方向,与传统的数字滤波器相比,具有高带宽、低损耗、抗电磁干扰等优点,以及能够实现带通或陷波中心频率响应的连续可调谐,正逐渐成为光纤通信领域关注的焦点。本文主要深入研究了基于相位调制的可调谐微波光子滤波器,主要内容如下:第一、介绍了微波光子滤波器的系统结构及其应用,并根据不同特性对微波光子滤波器进行了分类,总结了近年来可调谐微波光子滤波器的研究现状。第二、详细的阐述了基于相位调制的带通微波光子滤波器和基于相位调制的陷波滤波器微波光子滤波器的基本原理,并对微波光子滤波器的主要性能参数进行了分析,为之后章节介绍的可调谐微波光子滤波器做了理论铺垫。第三、提出了一种基于四波混频的可调谐微波光子滤波器。根据四波混频效应产生多波长作为微波光子滤波器的光源,分别提出了带通和陷波微波光子滤波器系统结构。在带通微波光子滤波器系统结构中,通过连续的改变两台单波长可调谐激光器的波长间隔,从而使四波混频效应产生的多波长光源的波长间隔连续地改变,实现了带通微波光子滤波的通带中心频率的连续可调谐。在陷波微波光子滤波器系统结构中,通过FD-OP控制相位调制信号的边带和相位实现滤波器的陷波频谱响应,再通过FD-OP对光载波和上边带调制信号引入额外的相移量实现滤波器陷波位置的连续调谐。第四、提出了一种基于多波长光纤激光器的可调谐微波光子滤波器。根据非线性偏振旋转效应产生多波长光信号作为微波光子滤波器的光源,通过增加光载波的波长数目来降低带通和陷波微波光子滤波器的带宽。在该系统结构中,通过引入FD-OP对相位调制信号的边带进行控制,实现相位调制向单边带强度调制的转换,并且通过FD-OP对相位调制信号的边带和相位进行控制,在实现调制转换的同时实现了带通滤波器向陷波滤波器的切换。最后通过FD-OP对光载波和上边带调制信号引入额外的相移量实现滤波器带通和陷波中心频率的连续调谐,并且在中心频率调谐的过程中频谱响应的形状保持不变。
[Abstract]:As an important research direction of microwave photonics, microwave photonic filter has many advantages, such as high bandwidth, low loss, anti-electromagnetic interference and so on, compared with traditional digital filter. And the continuous tunable frequency response of bandpass or notch center is gradually becoming the focus in the field of optical fiber communication. In this paper, the tunable microwave photonic filter based on phase modulation is studied. The main contents are as follows: first, the system structure and application of microwave photonic filter are introduced. Microwave photonic filters are classified according to different characteristics, and the research status of tunable microwave photonic filters in recent years is summarized. Secondly, the basic principles of band-pass microwave photonic filter based on phase modulation and notch filter based on phase modulation are described in detail, and the main performance parameters of microwave photonic filter are analyzed. The theoretical foundation for the tunable microwave photonic filter described in the following chapters is provided. Thirdly, a tunable microwave photonic filter based on four-wave mixing is proposed. According to the multi-wavelength generation of four-wave mixing effect as the light source of microwave photonic filter, the structure of bandpass and notch wave microwave photonic filter system is proposed. In the structure of band-pass microwave photonic filter system, by changing the wavelength interval of two single-wavelength tunable lasers continuously, the wavelength interval of multi-wavelength light source produced by four-wave mixing effect can be continuously changed. The frequency of the passband center of band-pass microwave photonic filter is continuously tunable. In the structure of notch microwave photonic filter system, the notch spectrum response of the filter is realized by controlling the sideband and phase of the phase modulated signal by FD-OP. Then the filter notch position can be tuned continuously by introducing extra phase shift to the optical carrier and upper-band modulation signal by FD-OP. Fourthly, a tunable microwave photonic filter based on multi-wavelength fiber laser is proposed. According to the nonlinear polarization rotation effect, multi-wavelength optical signal is generated as the light source of microwave photonic filter, and the bandwidth of bandpass and notch microwave photonic filter is reduced by increasing the number of wavelength of optical carrier. In the system structure, FD-OP is introduced to control the sideband of the phase modulated signal, and the phase modulation to the intensity modulation of the single sideband is realized, and the sideband and phase of the phase modulated signal are controlled by FD-OP. At the same time, the bandpass filter is switched to notch filter. Finally, an extra phase shift is introduced into the optical carrier and upper-band modulation signal by FD-OP to realize the continuous tuning of the filter bandpass and notch central frequency, and the shape of the spectrum response remains unchanged during the central frequency tuning.
【学位授予单位】：天津理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN713

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