微波光子技术是指将微波信号加载在光载波上，利用高频率、大带宽的光学系统进行微波信号的传输和处理。其中微波光子滤波器作为微波光子系统中必不可少的部件之一，由于克服了电域微波滤波器频率低、不可重构、可调范围小以及受电磁干扰影响大等问题，在频率选择、抑制噪声干扰和波分复用过程中至关重要。微波光子滤波器当前的主要研究方向为增加滤波器工作带宽、提高通带品质因子（Q值）以及实现可调谐可重构特性等方面。论文面向当前微波光子滤波器的工作需求，对基于色散光纤的微波光子滤波器性能进行了探索性研究，取得如下成果：1、针对延时介质为色散光纤的滤波器系统中由三阶色散所引入的通带畸变、Q值不可控问题，进行了详细理论分析，并基于所构建的滤波器结构，提出了一种基于微波光子滤波器传递函数的在线三阶色散测量与补偿方法。通过对滤波器色散的精确补偿，实现了低频段Q值误差低至0.2%的高度可重构可调谐单通带微波光子滤波器。2、提出并验证了一种具有可调谐和可重构功能的高质量W波段（75-110 GHz）微波光子滤波器的实现方案。通过对光谱处理器的原理进行分析，揭示了在补偿三阶色散时，滤波器工作频率与系统三阶色散之间的反比关系。对于光谱处理器补偿能力不足所引入的工作频段受限问题，提出了基于二次相位提供器（quadratic phase provider QPP）的三阶色散预补偿方案，有效扩展了系统的三阶色散补偿范围，实现了创纪录的Q值高达6459的可调谐且高度可重构的单通带W波段滤波器。3、提出了一种新型的快速可调谐微波光子滤波器实现方案。对于实现快调谐滤波器所必需的快速可切换光延时线器件，给出了一种基于片上电控光束偏转器结合光反射器的设计方案。利用电光晶体线性电光效应的超快响应特性，理论上可以在纳秒量级实现滤波器中心频率的快速可调谐。
Microwave photonic technology refers to transmitting or processing microwave signals via a high-frequency, large-bandwidth optical system. As one of the indispensable components in the microwave photonic subsystem, microwave photonic filter (MPF) is designed with the aim of carrying equivalent tasks to those of an ordinary microwave filter within a radio frequency(RF) system, bringing supplementary advantages inherent to photonics such as high bandwidth, tunability, reconfigurability, immunity to electromagnetic interference. The current research focus of MPFs is to increase the filter operating bandwidth, improvethe passband quality factor (Q value), and achieve tunable reconfigurable features. Based on the latest performance requirements of the MPFs, this paper studies the response of MPFs based on dispersive fibers, and achieves the following results: 1. A detailed theoretical analysis about the passband broadening and Q-value reduction introduced by the third-order dispersion in the filter system is presented. Based on the proposed filter structure, an accurate inline third-order dispersion measurement and compensation method based on the transfer function of MPF is presented. A highly reconfigurable tunable single-pass MPF with a Q-value error as low as 0.2% is achieved by accurate compensation of the filter third-order dispersion. 2. A W-band (75-110 GHz) MPF with tunability and reconfigurability is proposed and verified. The analysis of the principle of the optical spectral processor (OSP) reveals the inverse relationship between the operating frequency and the third-order dispersion of the system. In order to broaden the working frequency limit introduced by insufficient spectral processor compensation ability, a third-order dispersion pre-compensation scheme based on a quadratic phase provider (QPP) is proposed, which effectively expands the third-order dispersion compensation range of the system. With an almost complete cancelation of third-order dispersion in the ?lter, a tunable and recon?gurable single-passband W-band ?lter with a 3-dB bandwidth of around 15.5 MHz and a record-setting Q-factor of 6459 is obtained.3. A novel rapidly tunable microwave photon filter implementation scheme is proposed. Based on the fact that a fast switchable optical delay line device is necessary for a rapidly tunable filter, a design scheme based on an on-chip electronically controlled beam deflector combined with a light reflector is presented. Using the ultra-fast response characteristic of the linear electro-optic effect of the electro-optical crystal, it is theoretically possible to achieve fast tunability of the filter center frequency in the nanosecond order.
