硅-有机复合光子集成技术充分发挥了硅光的大规模集成优势和有机聚合物材料的高电光系数优势, 在高性能集成微波光子系统中极具应用潜力。本文对硅-有机复合集成电光调制器结构进行了较为全面地优化设计和初步制备研究。电光有机聚合物填充在硅Slot波导的狭缝中, 优化Slot波导结构得到光场限制因子为0.32, 使得光波场与射频电场高度重合, 提高了电光调制效率。采用锥型波导模式转换结构实现Strip-to-Slot的低损耗耦合, 耦合效率为99.55%。重点分析了电极长度、宽度等参数对调制器频率响应的影响, 优化得到3 dB带宽为77 GHz, 半波电压-长度积为0.045 V·cm。根据仿真结果设计了用于制备调制器的MASK。实验制备了Slot波导并进行了聚合物的填充实验研究, 获得了良好的结果。

针对全双工通信系统设计了光子集成射频自干扰消除功能芯片.该芯片采用相位调制将射频信号转换至光域，在光域内进行光载射频信号的幅相调控以实现干扰对消功能.对功能芯片中主要功能单元进行优化设计后，延时调谐范围为0~10 ps, 30 GHz带宽内的延时抖动小于0.1 ps; 滤波响应阻带抑制度为36.5 dB，通带带宽为60.6 GHz，边沿陡峭度为9.2 dB/GHz.建立了光子集成芯片射频自干扰消除系统的理论模型，对功能芯片中可调光延时线、可调光衰减器及滤波器等引入的延时、幅度不匹配对系统消除性能的影响进行了仿真分析.结果表明，幅度失配量为0.02 dB时，2 GHz带宽信号下系统抑制度为-42.7 dB; 延时抖动为0.07 ps时，2 GHz带宽信号下系统的抑制度为-37 dB.研究结果可为光子集成射频干扰抑制功能芯片的研制提供参考.

A bandwidth-reconfigurable filter is necessary to meet the need of growing communication capacity and signal cover-age frequency range. The stimulated Brillouin scattering (SBS) gain spectrum as a filter passband is used to extract de-sired microwave signals. Due to the fact that the passband is formed by mapping the Brillouin gain spectrum, band-width reconfigurability can be implemented by changing Brillouin gain linewidth. In this paper, a scheme using a 5-lines optical comb acting as a Brillouin pump is experimentally demonstrated. The spectrum of the 5-lines optical comb is extended by a binary phase shift keying (BPSK) pulse modulated signal. Experiments have shown that the 3-dB and 20-dB bandwidths of the filter are 196 MHz and 257 MHz, respectively, and its 20-dB shape factor is 1.31. The passband ripple is ~3.5 dBm with stop-band rejection of 20 dBm under 15 dBm optical pump power.

为了在光学相控阵中实现双波束成形和2维扫描，以玻璃作为基底材料，以液晶作为移相介质，利用液晶的电控移相特性，对入射光束进行双波束成形和相控空间扫描; 采用现场可编程门阵列芯片对液晶驱动芯片进行波控数据发送，完成对液晶移相阵列的电压驱动，从而达到电控光束扫描功能，完成单个透射型液晶光学相控阵组件的研制; 利用该组件的电控光束扫描功能，采用多个组件级联的方式，实现基于透射型液晶光学相控阵组件的双波束成形和2维扫描技术。结果表明，该系统能够实现双波束独立偏转控制，以及高精度的空间2维偏转。

For the nonlinearity distortion problem of Mach-Zehnder modulator (MZM) applied in the on-board microwave photonics system, the situation for two input radio frequency (RF) signals with different frequencies and phases is discussed, and an exact analytical solution is derived with the method of expanding Bessel series and Graf addition theory. According to the analytical expression, the nonlinearity characteristics of the modulator can be precisely predicted, and the system performance can be optimized. The correctness of the analytical solution is approved by simulation results. Analytical results indicate that the nonlinearity distortion is suppressed as the decrease of modulation index, the increase of direct current bias phase shift and phase difference between two input RF signals. When the phase difference equals zero or π and the direct current bias phase shift is π/2, there are only odd-order distortion terms. When the phase difference equals zero or π and the direct current bias phase shift is π, there are only even-order distortion terms.

For the scheme of 80 GHz optical millimeter-wave (mm-wave) generation using two cascaded Mach-Zehnder modulators (MZMs), an exact analytical solution for the optical mm-wave affected by phase shift drift and splitting ratio is derived with the method of expanding Bessel series. The results show that for the carrier and the fourth-order sideband, the influence caused by phase shift drift is dominant, while the first-order, the second-order and the third-order sidebands are influenced by both phase shift drift and splitting ratio. It follows that the undesired sideband suppression ratio is at least 35.9 dB when the splitting ratio deviation is 0.001, and the phase shift drift is 1o. The performance of the system is perfect if the accuracy is achieved.

将光CDMA技术应用到无线光通信中。提出了基于脉冲位置调制的二维大气无线光CDMA通信系统，并分析了该通信系统的性能。考虑多用户干扰、APD噪声以及热噪声等干扰因素的影响，采用数值分析的方法，详细分析了大气湍流引起的大气闪烁对二维无线光CDMA通信系统误码率的影响。结果表明，大气闪烁是影响二维无线光CDMA系统误码率性能的一个重要因素；当大气闪烁的对数方差较小(如σ(2，s)=0．1)时，该系统可以实现高速率通信；当大气闪烁的对数方差较大(σ(2，s)≥0．2)时，在有限的光功率条件下，该系统难以实现通信，需要采用信道编码技术来提高系统的误码率性能。