A novel tunable optoelectronic oscillator (OEO) based on a photonic radio frequency (RF) phase shifter is proposed and analyzed, which consists of a dual-drive Mach-Zehnder modulator (DMZM), a 90° hybrid coupler and a tunable microwave amplifier (TMA). This tunable OEO has a simple configuration, and the frequency of the oscillating signal can be tuned by adjusting the amplification factor of the tunable amplifier. The simulation results show that the maximum frequency shift from the center oscillation frequency is 1.48 MHz when the amplification factor of the TMA is set at 10.

A novel dual-loop optoelectronic oscillator (OEO), which is constructed based on all optical signal processing, is proposed and analyzed. By inserting an erbium-doped fiber amplifier (EDFA) and a fiber Bragg grating (FBG) on the optical domain, the amplification and filter are implemented in the OEO loop. The performance of the OEO is improved without any electronic filter or electronic amplifier. A theoretical analysis is performed, and the generated microwave signal exhibits good performance with phase noise lower than -120 dBc/Hz at 10 kHz and a high side-mode suppression ratio (SMSR).

A new optical label switching system with coherently detected implicit spectral amplitude code (SAC) labels is proposed in this paper. The implicit SAC labels are recognized using a frequency-swept local light source oscillator. An explicit SAC-label switching system with 40 Gbit/s intensity modulation (IM) payloads and 156 Mbit/s label and an implicit SAC-label switching system with 2.5 Gbit/s IM payloads and 156 Mbit/s label are both considered. Label and payload bit error rate (BER) performance is assessed and compared by simulations. The results reveal that after 80 km transmission and at the BER of 10-9, the received optical power (ROP) values of label and payload are -8.3 dBm and -23.5 dBm in implicit SAC-label switching system, respectively, while those are -18.2 dBm and -18.6 dBm in explicit SAC-label switching system, respectively. As a result, the payloads of 40 Gbit/s and 2.5 Gbit/s in explicit/implicit SAC-label switching system have little influence on the received payload quality at the BER of 10-9 after 80 km transmission. Finally, a payload of 40 Gbit/s can obtain 12.5 dB optical signal-to-noise ratio (OSNR) after 80 km transmission.

A new integrated optical three-dimensional (3D) electric field (E-field) sensing system is shown in this paper. In the system, the method of tuning laser’s wavelength is used for controlling the working point of the integrated optical E-field sensor to keep it always in linear working area. The sensing system contains three independent E-field sensors, and the tuning of their working points and the sensing of electric signal are completed by adopting time-division multiplexing (TDM) technique. Then, the theoretical analysis and simulation of the working mechanism of the E-field sensing system are done in this paper. The results show that the bandwidth of electric signal is directly related with the tuning time of working point, and also determines the working rate of the controlling system.

为了研究集成光波导电场传感器分段电极的频率响应特性，采用时域有限差分法进行了数值计算，并在吉赫兹横电磁波室中对实际制作器件的频率响应特性进行了测试。结果表明，当分段数固定在10、电极总长度从42mm减小到12mm时，频率响应带宽从2.68GHz增加到5.91GHz；而当电极总长度保持为42mm、分段数从10增加到30时，频率响应带宽从2.68GHz减小到2.51GHz，变化不大。实际测试的结果与仿真结果大致相符。

研究了单帧红外图像小目标的检测问题。对传统基于数学形态学的Top-hat 算子进行分析和实验，发现依靠单独的Top-hat 算子并不能准确地检测出目标，文章在Top-hat 算子的基础上，利用一种分块自适应阈值和小范围内目标检测的方法进行目标检测，通过MATLAB 仿真发现，这种方法能够在一定程度上提高单帧图像目标检测的成功率。通过在两个不同的场景中的实验结果分析，发现这种方法不仅适应于单一环境，在实际应用中具有一定的鲁棒性。

采用微扰法研究了左手介质矩形波导的吸收特性。由于色散方程的限制，左手介质波导不能传输基模，它的吸收特性也与右手介质矩形波导明显不同。结果发现， 模式的衰减系数随长宽比(a/b)的增加而减小，而在右手介质波导中结果恰恰相反。除此之外，当不同模式的光波在同一左手介质矩形波导中传输时，每一模式都对应着相邻很近的吸收峰和吸收谷。同时高阶模的衰减系数较低阶模的大。但是，当不同模式的光波在同一右手介质矩形波导中传输时，它们的衰减曲线随着波导宽度的增加而振荡的变化，并且趋近于芯层衰减系数。另外一方面，在右手波导中，高阶模式的衰减系数较低阶模式小。

为了提高一种3bit可变光纤延迟线的延时精度，提出一种采用可调谐激光器作为系统光源的技术，利用光纤的材料色散特性即光纤的折射率随传输波长变化而改变的特点，来改变延时光纤中信号存储的时间，从而达到提高光纤延迟线延时精度的目的。仿真结果表明，采用该种技术的光纤延迟线系统，平均延时误差从4．1ps下降到了1．3ps，延时精度得到了显著提高。

基于以太网的无源光网络(EPON)作为一种新兴的接入技术，需要网络设计者提供电信级(Carrier-class)的管理能力，而单纯的简单网络管理协议(SNMP)已经不能胜任其运营管理维护(OAM)的要求，正是由于上述原因，IEEE802.3ah工作组在新标准中专门规定了EPON系统的OAM协议。文章提出了基于802.3ah OAM协议和SNMP的EPON系统管理机制，并描述了EPON系统OAM的功能、特点以及在Linux操作系统下的该网络管理机制的软件实现方案。

从双包层光纤激光器的速率方程出发，得到了光纤中泵浦光与激光的功率分布、输出功率与泵浦功率的关系、腔镜反射率及光纤长度对输出功率的影响。研究结果表明：输出激光功率与光纤长度及后腔镜反射率有很强的依赖关系，存在一个输出功率最大的最佳光纤长度。后腔镜反射率越大，输出激光功率越小；当光纤长度较短时，在输出端放置反射镜使泵浦光高反射，可以提高输出功率和效率。通过对端面泵浦掺Yb³⁺双包层光纤激光器进行理论分析和实验研究，得到输出激光的中心波长为1088．3nm，斜率效率为33．7%，最大输出功率为1．75W。