金刚石车削在红外衍射光学元件加工中的应用

衍射光学元件（DOE）技术的发展和应用极大地改变了传统光学设计和制造方法。尤其在红外光学系统中，由于谱段的优势，折衍射混合式光学元件的应用得以快速推广。文中对金刚石单点车削加工技术在红外折衍射光学元件的设计和加工中的应用进行了讨论。     

基于LED光源的DLP光学引擎的光学设计

设计了一种基于LED光源照明系统的DLP背投电视光学引擎,样机以HD2+数字微镜(DMD),蝇眼透镜,X棱镜作为主要光学系统构件.介绍了基于光学扩展量etendue的光学系统设计方法,采用了蝇眼透镜阵列作为匀光方案来提高光能利用率和光源均匀度,分析了照明系统的工作原理和系统结构,并给出了仿真结果,样机在三组LED占空比为10:15:11的时序工作模式下白场输出光通量达到了112.3 lm,单色输出光通量分别为R.26.1 lm、G-51.4 lm、B-19.0 lm,光场均匀度小于±20%.     

基于FPGA的SFP光纤通信控制器的研究与设计

针对高速数据存储器对光纤数据高速率、大容量的要求,设计了一种SFP(small form pluggable) 热插拔小封装模块高速光模块控制器。该设计采用Spartan-6 FPGA为核心控制器、高速串行技术为支撑,进行了接口电路的设计,且重点介绍了控制器的自定义协议的设计和仿真。通过分析集成比特误码率测试仪器（IBERT）测试和Chipscope抓取的数据,验证了光纤数据能够以不低于1Gb/s的速率进行数据存储。结果表明该设计具有封装小,可移植性强等优点,在某高速数据存储器中已得到了成功应用。     

一种并行多路数字光模块的设计与实现北大核心CSCD

并行多路数字光模块在短距离光通信中有广泛应用,并行多路数字光模块的电芯片、光芯片大都采用裸芯片,针对非气密封装会使裸芯片暴露在空气中导致氧化、可靠性不高的问题,本文提出了一种全气密封并行多路数字光模块的设计方法,采用LTCC基板四周设置焊环及管壳设计环框的新型结构,实现了数字光模块基板与管壳的直接焊接,从而实现了并行多路数字光模块的全气密性设计,解决了数字光模块非气密封设计难题。以12路收发一体数字光模块为例,本文不仅介绍了并行多路数字光模块的设计原理、并行多路光路耦合的设计方法,而且给出了全气密封并行多路数字光模块的完整结构和实现方法,试验表明,气密性(最大漏率)为5×10~(-9)P·m~3·s~(-1)。本文提出的设计结构对并行多路数字光模块的全气密性设计具有重要的参考价值。     

基于共振光隧穿效应的加速度传感器

为了设计新型的加速度传感器，将共振光隧穿结构应用于传感元件，利用COMSOL软件对传感器的频率响应、灵敏度性能等关键要素进行了模拟仿真分析，搭建了实验平台，验证了共振光隧穿原理。结果表明，基于共振光隧穿效应结构的加速传感器在100Hz~3000Hz范围内、加速度为500m/s2的情况下，灵敏度可达到6.7dB/g。该传感器小巧轻便、结构简单，且具有较高的灵敏度，这为光学传感器的研究提供了新的方法和思路，具有广阔的应用前景。     

基于红外波段的大视场谐衍射透镜设计

针对目前光学设计中,通过增加光学元件数量、限制视场角等方法来平衡像差,导致光学系统较复杂的问题,提出了一种基于红外波段的大视场谐衍射透镜设计方法。使用光学设计软件Zemax进行光学设计,使用DLL编写了一种可以自定义的表面面型,使用这种表面进行分区优化,并结合标量衍射理论进行了成像效果分析。结果显示,所设计的谐衍射透镜具有21°的视场角,截止频率(以0.1作为对比度极限)为11.4 lp/mm,并通过实验验证了该透镜的大视场单透镜成像的可行性。     

激光数字化仪的光学系统设计

本文根据光点扫描测量技术,提出一种新型的激光数字化光学探头,它是利用小型半导体激光器和高分辨率光电探测器件CCD设计而成的。它可对自由模具表面进行快速的、非接触的、精密的测量,提取三维NC(numerical control)数据。其光学系统设计使用了针对特殊光路编写的光学CAD软件。     

紧凑低成本非制冷长波红外连续变焦光学设计

随着红外技术的快速发展,SWaP-C (尺寸小、质量轻、功耗低、成本低)概念已深入红外热像仪整机设计全过程。在非制冷连续变焦红外热像仪设计中,相对已模块化的非制冷探测器与成像电路、光学系统影响整机包络尺寸、产品质量及价格成本,因此设计一款总长短、质量轻、成本低、性能高的非制冷长波红外连续变焦光学系统将具有广阔的市场前景。非制冷长波红外连续变焦光学因相对孔径大、光学材料种类少等因素存在系统小型化和无热化设计难题,通过采用变F#设计方法约束物镜尺寸;利用三组联动变焦技术平衡像差、压缩系统总长;通过主动补偿的消热差技术使得系统在-40～+60℃温度范围成像质量良好,实现四片透镜构成的非制冷长波红外连续变焦光学系统设计。该系统工作波段为8～12μm,焦距变化范围为20.7～126 mm,对应F#为1.05～1.2,视场变化范围为21°×16.8°～3.5°×2.8°,变倍比为6.0×,最大物镜直径116 mm,光学系统总长180 mm,光学零件总质量418 g。该光学系统具有轻小型、高性能、低成本等SWaP-C特征,将在无人装备平台及手持热像仪设备中得到广泛应用。     

基于半导体-金属相变材料的宽谱、偏振选择的红外光开关

提出了一种基于半导体-金属相变材料和掩埋金属光栅结构的新型红外光开关。该结果由电磁场有限元方法计算得到。设计了在近红外波段表现出宽谱的、偏振选择的全光开关效应。掩埋金属光栅极大的提高了二氧化钒薄膜作为光开关的消光比,使得该结构在亚波长尺寸获得了高的消光比。结构的光学响应随入射角变化并不敏感。结构的透过、吸收特性可由结构参数进行调节。此设计在红外光通信、光计算以及军事探测、无损检测等领域具有潜在的应用。     

光子晶体垂直腔表面发射激光器及最佳化设计

单基模垂直腔表面发射激光器(VCSEL)在光网络数据传输、光互连、光存储和激光打印中有潜在的应用前景。光子晶体垂直腔表面发射激光器(PC-VCSEL)已成为备受关注的研究课题。介绍了PC-VCSEL的结构、最佳化设计及特性。     

Real-time Fourier transformations performed simultaneously overmultiwavelength signals

The real-time Fourier transformation (RTFT) has been previously proposed and demonstrated for a multitude of applications in the areas of optical communications, temporal signal processing, switching, filtering, time-division multiplexing, etc. Here, we present a technique for performing the RTFT simultaneously over all the channels of a multiwavelength (wavelength-division multiplexing) signal traveling in a single optical fiber. The technique only requires the reflection of the original signal in an appropriately designed structure of superimposed chirped fiber gratings. To demonstrate our proposal, we design a real-time optical spectrum analyzer operating on three different wavelength channels. The design is proved to function correctly by means of numerical simulations     

An analog front-end chip set employing an electro-optical mixeddesign on SPICE for 5-Gb/s/ch parallel optical interconnection

A chip set composed of a laser-diode driver (LDD) and an optical receiver (RCV), which incorporates a full 2D (reshape, regenerate) function, has been developed by using silicon bipolar technology for a four-channel 5-Gb/s parallel optical transceiver. An electro-optical mixed design on SPICE of the LDD and the LD is accomplished by describing the rate equations of the LD as an electrical circuit. This design accommodates easy connectivity of the LDD chip to the LD in the optical transmitter module without the need for adjustment of the optical waveform. A pseudobalanced transimpedance amplifier (TIA) and feedforward automatic decision threshold control (ATC) in the RCV minimize the number of off-chip bypass capacitors, eliminate the need for any off-chip coupling capacitors, and keep crosstalk less than -50 dB and low cutoff frequency less than 80 kHz. A prototype parallel optical transmitter module and a prototype receiver module, based on the chip set, demonstrated asynchronous four-channel 5-Gb/s operation. The chip set has a throughput of 20 Gb/s with a power dissipation of 1.3 W at a 3.3-V supply     

基于谐衍射的共轴双波段红外光学系统设计

随着精确制导技术的快速发展,对两个波段的辐射同时进行探测已显得非常重要,对应的光学系统及其设计需求空前增长。文中根据谐衍射透镜的消色差、消热差特性,在各个较低衍射级次上的共焦以及极高衍射效率的特性,在现有金刚石切削加工能力的条件下应用CODEV 光学设计软件设计了适用于-45~+71℃的共轴双波段红外光学系统,该系统在全温度范围内无需调焦其调制传递函数全部接近衍射极限,光学系统无渐晕,并且达到100%冷光阑效率。该红外双波段光学系统结构紧凑、片数少、透射比高,对于提高导引头的探测精度、识别能力、打击精度有质的飞跃。     

High-frequency, stripline, multireflection electrooptic beam deflectors

A novel electrooptic (EO) beam deflector has been designed through numerical simulation. This stripline lithium tantalate device has the potential to electrooptically modulate the deflection of an optical pulse at unprecedented frequencies. Velocity matching of the optical pulse to a high-frequency transmission line signal is achieved through reflections of the fast optical pulse. An optimal design criterion is formulated for this device. Deflection capability is estimated to be 8/spl deg/. The device is intended for use in deflection-based optical analog-digital (A/D) conversion.     

应用于高能激光系统的发射聚焦装置研究

为了满足当前高能激光系统的工程应用需求,设计了针对高能激光聚焦的发射聚焦装置。首先选取了折反式二级扩束光学系统作为设计模型,然后利用光学设计软件序列模式对光学系统进行了设计优化,获得了平面波光束在不同距离聚焦的设计结果。其次由于平面波光束和高斯光束在调焦量上存在差异,通过矩阵光学理论计算了针对高斯光束聚焦的调焦修正量,并利用光学设计软件非序列模式重构光学系统,并以非相干空间合束的高斯光束作为入射光,进行了高能激光的传输聚焦仿真验证。在系统参数一致的条件下,与常规的离轴反射式光学系统进行对比。对比结果证实了本文设计的光学系统光学性能优良,可满足对入射高能激光在0.5~5 km范围内聚焦,最后开展的样机实验也验证了设计的正确性和合理性。     

Design of Optical Content Distribution Networks for Video on Demand Services

This paper presents the design of optical content distribution networks for video on demand (VoD) services. The proposed Ethernet-based WDM network architecture is decentralized and consists of independent regional ring networks with locally deployed video servers. Based on an Integer Linear Programming (ILP) model, a network design tool, minimizing the total installation cost for optical network equipment on the metro and the Hybrid Fiber Coax (HFC) access network, has been developed. Unicast as well as broadcast VoD services are taken into account. The influence of different parameters in our traffic and content models on the network design is studied.     

Design and analysis of an optical waveguide tap for silicon CMOScircuits

A compact low-loss optical tap technology is critical for the incorporation of optical interconnects into mainstream complementary metal-oxide-semiconductor (CMOS) processes. For this work, an effort has been made to establish an optimal integrated optical tap design in terms of optical loss, bandwidth, economy, and process compatibility with multimetal layer CMOS circuits. A new device, which is based on a variation of the multimode interference effect, has been found to be especially promising. Two-dimensional (2-D) and three-dimensional (3-D) simulation results show low excess optical loss (<0.1 dB) for the design, and a nominal 40% (2.2 dB) optical coupling into the CMOS circuitry over a wide range of guide to substrate distances. Simulated tap devices are on the order of 15 [tin in length. Polymer waveguide materials are targeted for tap fabrication due to planarization properties, low cost, broad index control, and poling abilities for modulation-tuning functions. Low-cost silicon CMOS-based processing makes the new tap technology especially suitable for computer multichip module and board level interconnects, as well as for metro fiber to the home and desk telecommunications applications     

Gigabit receiver ICs for optical communications

The authors discuss gigabit receiver ICs for optical communications, focusing on their circuit and package design, the performance of receivers that were fabricated, and their application to a 1.6 Gb/s optical receiver. The key technologies for the receivers are discussed, and a design based on these key technologies is proposed. The proposed design is used to fabricate six receiver ICs (eight chips) using an ultra-high-speed bipolar process with transistors having a unity gain bandwidth of 6-8 GHz. The receivers are suitable for long-haul optical transmission at bit rates up to 1.6 Gb/s. Experimental results show that the 1.6 Gb/s receiver has an optical dynamic range of more than 23 dB without any adjustment, and the received average optical power required to maintain a 10^-11 error rate is less the -31 dBm     

一种一体化光纤声光调制器

该文采用光纤声光调制器集成化、低功耗和热仿真设计技术,设计并制作了工作波长1550nm、光脉冲上升时间16．7ns、光脉冲延时抖动1．5ns、电功耗0．72 W(脉冲)、整体尺寸59．56mm×49．48mm×14．6mm 的高性能一体化光纤声光调制器。结果表明,该调制器具有体积小及功耗低等优点,对小型化低功耗光纤激光器、 激光测风雷达及光纤分布式传感系统的研制有一定促进作用。     

基于半导体微环谐振器的光滤波器设计方法

提出了一种完整的基于微环谐振器的光学滤波器的系统设计方法。使用该方法可以从一定滤波特性参数出发,计算得到每个环之间的耦合系数,再根据耦合系数和器件尺寸的关系得到具体的器件尺寸,从而实现光学滤波器从性能特性到器件尺寸设计的一整套完整的解决方案。并在此基础上利用感应耦合等离子体(ICP)干法刻蚀技术和聚酰亚胺介质平坦化工艺制作了双环光滤波器,对该设计方法进行了初步的实验验证,使用扫描电子显微镜和原子力显微镜等多种测试方法证实,制作的光波导具有很好的性能,测试了其梳状滤波特性。