结合有机聚合物材料和无机SiO2材料, 设计一种1×2多模干涉—马赫曾德尔干涉仪热光开关, 优化器件参数, 并对其性能进行模拟.利用化学气相沉积、光刻等工艺制备热光开关, 并对其波导形貌进行表征.为了测试器件性能, 采用ARM7处理器和InGaAs光电探测器, 设计并研制了一种光开关性能测试系统.该系统主要由低纹波线性供电电源、光电探测器、前置放大器、主放大器、信号调理器、模数转换器、主控制器、显示器等构成.采用商用光功率计对该测试系统进行标定, 其零点漂移小于0.5 dBm.在光开关电极上施加不同的直流驱动电压, 作为对比, 利用自主研制的光功率计和商用光功率计分别测试光开关某端口的输出光功率.实验结果表明, 两种情况下测得曲线的变化趋势一致, 均在驱动电压为10 V时, 输出光功率达到最小值.该测试系统具有良好的性能, 可满足实际测试需要.

Optimization and simulation are performed for a polymer four-port microring optical router with three channel wavelengths, which contains four-group basic routing elements with two different ring radii. In terms of microring resonance theory, coupled mode theory and transfer matrix method, expressions of output power of basic routing element and optical router are derived. In order to realize single-mode propagation, low optical transmission loss and phase match between microring waveguide and channel waveguide, the device parameters are optimized. With the selected three channel wavelengths of 1550 nm, 1552 nm and 1554 nm, characteristics are calculated and analyzed, including output spectrum, insertion loss and crosstalk. Simulation results indicate that the device has 12 possible I/O routing paths, the insertion losses of three channel wavelengths along their routing paths are within the range of 0.02-0.61 dB, the maximum crosstalk between the on-port along each routing path and other off-ports is less than -39 dB, and the device footprint size is ~0.13 mm₂. Based on the proposed structure, through proper selection on ring radius, the routing structure can also be used for other channel wavelengths. Therefore, the designed structure shows wide applications in integrated optical networks-on-chip (NoC).

利用两组串联五环谐振器以及它们与两信道波导的交叉耦合作用,优化设计并模拟了一种超低串扰2×2新型聚合物电光开关.为了表征器件的输出光功率特性,给出了器件结构、分析理论和相关公式.为了在下行端口（drop端口）得到箱型光谱响应以及极低的串扰和插入损耗,优化了微环谐振级数和耦合间距.对器件输出光功率和输出光谱的模拟分析结果显示,器件交叉和直通态间的切换电压为4 V,交叉和直通态下两端口间的串扰分别为－66 dB和－54.7 dB,插入损耗分别为2.34 dB和 0.24 dB.在1 GHz方波信号作用下,器件drop端口的上升和下降时间分别为15 ps和90 ps.由于聚合物微环的弯曲半径仅为19.45 μm,因此该器件具有超紧凑的尺寸,其长度和宽度仅为0.407 mm,约为马赫-曾德尔干涉仪或者定向耦合器等一般结构聚合物电光开关长度的1/10.依赖于小的封装尺寸和极低的串扰,该器件可以高密度地集成在光电子芯片上,在光片上网络中光信号的控制方面具有潜在的应用.

A novel 1×2 polymer electro-optic (EO) switch based on seven vertical-turning serial-coupled microrings is proposed for dropping crosstalk and obtaining flat boxlike spectrum. The device structure, theory and formulation are presented, and the microring resonance order and coupling gaps are optimized. The switching voltage of the device for obtaining crosstalk lower than ?30 dB under through state is decided to be about 1.86 V. Under the operation voltages of 0 V (drop state) and 1.86 V (through state), the switching performance is characterized, and the output spectrum is analyzed. The calculation results show that the crosstalk at through state and that at drop state are ?30.2 dB and ?53.2 dB, respectively, while the insertion losses are 0.86 dB and 3.18 dB, respectively. Owning to the seven serial-coupled microrings resonance structure, the proposed switch reveals the favorable boxlike spectrum compared with the simple device with only one microring, and thus the crosstalk under drop state is improved from ?26.8 dB to ?53.2 dB. Due to the low crosstalk, this device can be used in optical networks-on-chip for signal switching and routing.

A 2×2 cross/bar polymer electro-optic (EO) routing switch is proposed, which is composed of two passive channel waveguides and two active EO polymer microrings with bending radius of only 13.76 μm. Detailed structure, theory and formulation are provided to characterize the output power of the switch. For obtaining fundamental mode propagation, small bending loss and phase-matching between channel waveguide and microring resonator (MRR) waveguide, the structural parameters are optimized under the wavelength of 1550 nm. Analyses and simulations on output power and output spectra indicate that a switching voltage of 5 V is desired to realize the exchange between cross state and bar state, the crosstalk under cross state and that under bar state are about -28.8 dB and -39.9 dB, respectively, and the insertion losses under these two states are about 2.42 dB and 0.13 dB, respectively. Compared with our four EO switches reported before, this device possesses ultra-compact size of 0.233 mm×0.233 mm as well as low crosstalk and insertion loss, and therefore it can serve as a good candidate for constructing large-scale optical routers or switching arrays in photonic network-on-chip (NoC).

为了实现井下多通道瓦斯浓度的数据采集、处理、通信和测试，设计了一种以单片机器件为核心的光纤型SPR传感网络。围绕单片机器件，该网络同时结合了光开关器件、串口器件。为了实现多路通信，同时考虑到机械光开关具有较低的损耗与较高的扩展性，文中采用32路机械光开关；控制光开关实现32路循环检测的是89C52单片机，此单片机具有大容量，高速率的特点；另外，设计中编写了系统运行时的总程序，并通过Labview软件进行了瓦斯浓度报警仿真实验。

针对激光光幕坐标靶测试中控制器I/O 口不足的问题，提出现场可编程门阵列(FPGA)和单片机相结合实现高速密集多路光电信号的并行采集与控制。采用FPGA作为光电开关信号数据的采集和存储装置，单片机控制FPGA的工作，并处理、显示数据。对7.62 mm弹丸的过靶坐标进行了测试实验，结果证明，基于FPGA和单片机的高速密集多路光电信号并行采集与控制系统解决了传统激光光幕测坐标靶的处理器I/O 口紧缺、处理速度慢等缺点。系统具有响应速度快、灵敏度高、可拼接的优点。

通过对光电转换电路的前置放大及主放大电路设计的详细分析研究，给出了电路放大、滤波、降噪等优化处理方法，实现了将有用信号从噪声中分离并输出的目的.对光电转换电路从原理设计到最终制板过程中影响其性能参数及稳定性的因素进行了深入的探讨，提出了对电路器件选择、排列、布线以及降噪等方法的选择标准和依据.