光子晶体及其在光通信中的应用研究

介绍了光子晶体的概念,分析了光子晶体在光通信中的主要应用,讨论了光子晶体光纤的光传输性质以及由光子晶体构造的光通信器件,指出了光子晶体对未来光通信技术发展的重要意义。     

光学微腔在微波光子雷达系统中的应用

微波光子雷达通过光子技术辅助可突破传统电子技术瓶颈,实现光子系统集成化是未来微波光子雷达的必然发展趋势。具有超高品质因子的光学微腔得益于其独特的线性和非线性光学特性,可在极小的体积内实现宽带微波信号的光域调控,是集成微波光子雷达系统的关键核心元件,在微波光子滤波、光生微波信号、光子辅助信道化接收和光控波束形成等系统功能单元中都具有重要的应用价值,并且在未来太赫兹雷达、激光雷达等系统中也具有广阔的应用前景。     

光学新技术

介绍了新型光学技术。引入新的光学概念 :光子晶体 ,光子能带以及光子晶体制造技术     

硫系玻璃集成光子器件综述(特邀)

硫系玻璃具有超宽的红外透过光谱范围、较高的线性折射率、极高的光学非线性和超快的非线性响应,近年来在集成光子器件研究领域备受关注。首先回顾了硫系玻璃集成光波导的制备,综述了硫系集成光子器件在红外传感和高性能非线性应用方面取得的进展,然后介绍了硫系相变光子器件在光开关、光存储和光计算等方面的前沿进展,最后对目前硫系玻璃光子器件研究存在的问题进行了归纳,并对未来的研究方向进行了展望。     

120-GHz wireless link using photonic techniques for generation, modulation, and emission of millimeter-wave signals

We present a wireless link system that uses millimeter-wave (MMW) photonic techniques. The photonic transmitter in the wireless link consists of an optical 120-GHz MMW generator, an optical modulator, and a high-power photonic MMW emitter. A uni-traveling carrier photodiode (UTC-PD) was used as the photonic emitter in order to eliminate electronic MMW amplifiers. We evaluated the dependence of UTC-PD output power on its transit-time limited bandwidth and its CR-time constant limited bandwidth, and employed a UTC-PD with the highest output power for the photonic emitter. As for the MMW generation, we developed a 120-GHz optical MMW generator that generates a pulse train and one that generates a sinusoidal signal. The UTC-PD output power generated by a narrow pulse train was higher than that generated by sinusoidal signals under the same average optical power condition, which contributes to reducing the photocurrent of the photonic emitter. We have experimentally demonstrated that the photonic transmitter can transmit data at up to 3.0 Gb/s. The wireless link using the photonic transmitter can be applied to optical gigabit Ethernet signals.     

一种新型光子晶体的光学特性研究

本文提出了一种非对称一维各向异性掺杂光子晶体,通过传输矩阵法研究了这种新型光子晶体的光学特性,通过数值模拟得出:光通过该结构光子晶体后TE波和TM波缺陷模的透过率及中心波长位置随缺陷层介质的光学厚度、缺陷层两侧周期数的非对称性的变化规律,两种偏振光波能完全分开,缺陷层介质的光学厚度及掺杂层两侧的周期数层差越大,缺陷模的透过率越小,当光学厚度及层差达到某一极限值时,将产生完全光子禁带,这是对称结构光子晶体所不具备的光学特性,其光学特性将为光子器件的转换制作及应用提供理论依据。     

一维多层介质光子晶体的禁带特征及其在滤波中的应用

利用光学传输矩阵法,研究了一维多层介质光子晶体的禁带特征.分析讨论了介质层排列、折射率及几何厚度等因素对光子晶体禁带的影响,进一步数值计算研究表明四层介质以上的光子晶体会因介质层排列顺序不同而产生不同的光子禁带,利用这一特点设计了一种新型的光子晶体滤波器,并研究了其窄带滤波特性.     

波分复用各向异性光子晶体滤波器

从光子晶体的光子频率禁带特性出发，提出了用两个或两个以上的各向异性周期结构光子晶体叠加在一起，形成叠层结构光子晶体，以获得窄带滤波特性的设想；利用光学传输矩阵法研究了这种结构的光子晶体，分析了在不同入射角和折射率条件下，该周期结构的透射和偏振的光学特性。分析表明，各向异性光子晶体在折射率比值较大或与高折射率各向同性介质结合使用，可以获得较窄的通带，从而实现滤波。数值模拟的结果也证实了上述构思的正确性。     

Architectural considerations for photonic IP router based uponoptical code correlation

A photonic label switching router (PLSR) of which the photonic label processing is based upon optical code correlation, is investigated. To resolve the electronic router's bottleneck in current Internet protocol (IP) over wavelength division multiplexing (WDM) networks, we will envision IP over photonic networks in which the PLSRs totally replace the electronic routers. The architectures of PLSR including the photonic label processing, the photonic label swapping, and the optical switching and their optical implementations are studied. Results of proof-of-concept experiments for the photonic label processing and photonic label swapping will confirm the feasibility to attain the target performance: the throughput of 100 Tb/s at least, the processing speed around 10 Gpacket/s, and the number of label entries up to 10 k     

对称结构光子晶体的表面光学Tamm态

利用传输矩阵理论和等效原理,从能级的角度研究对称结构光子晶体表面光学Tamm态,结果表明:当光子晶体的排列周期无限大时,入射介质与光子晶体间不满足阻抗匹配条件,从而不出现表面光学Tamm态;当光子晶体被截断成有限周期时,其表面可支持表面光学Tamm态的存在,且轴向传播时通带中出现TM和TE偏振的能级简并现象,离轴传播时从通带边缘分离出来的非简并能级被局域于光子晶体表面而形成了表面光学Tamm态;当光子晶体截断参数与最外层高折射率介质匹配时,容易形成束缚性较强的表面光学Tamm态,与最外层低折射率介质匹配时,则难以实现表面光学Tamm态;通过ATR全反射技术对光子晶体表面态进行激发可观察到被激发的耦合共振吸收现象。对称结构光子晶体表面光学Tamm态的特性可为光子晶体光波导和表面波传感器的研究和设计提供指导。     

双周期渐变光子晶体结构及其纳米聚焦效应

利用3+3光束双锥干涉法设计了双周期渐变光子晶体结构阵列,并研究了它的纳米聚焦效应。通过调整内锥角和内外锥的增量角来改变光子晶体晶格的小周期及光子阵列的大周期,通过调整光束强度、偏振方向来实现渐变光子晶体晶格结构、形状等参数的改变。采用傅里叶变换的方法研究了光子晶体结构对光场的纳米聚焦效应。该结构对于提高发光二极管的提取效率、光显示、光耦合及光集成具有非常重要的意义。     

光子晶体的研究新进展及应用

光子晶体具有调节光子运动状态的特性,在光通信、医学和国防科技等领域具有非常广阔的应用前景.简要介绍了光子晶体的主要特征及制备方法,总结了基于光子晶体的光纤,激光器,滤波器和集成光路的工作机理和最新研究成果.     

Analysis on characteristics of 1-D apodized and chirped photonic crystals containing negative refractive materials

Using transfer matrix method, the optical transmission properties of 1-D photonic crystals composed partially of negative refraction media are analyzed. The transmission spectra of periodic photonic crystal, chirped photonic crystal and apodized photonic crystal are numerically simulated respectively. By contrast with optical transmission properties of ordinary photo- nic crystals made of positive refraction media, the transmission spectra of apodized photonic crystal become unregular, the Bragg flat-headed area recurs but the peak of transmission does not change significantly. Futhermore, the band gap range of chirped photonic crystal diminishes gradually.     

Robust photonic transport network implementation with optical crossconnect systems

We adopt the optical path concept to develop a photonic transport network. Because robustness is critical in a nationwide backbone network, we implement, as a first step, digital frame-based optical path network systems. NTT has developed several types of photonic transport systems. They are an optical path cross-connect system which has little quality of service monitoring large-scale integration circuit for each wavelength; a photonic transport payload assembler-disassembler, which accommodates client signals into optical path payloads and vice versa; and a repeater. The implementation of a PTS is depicted. A network-element-level operating system and an optical-network-level operating system are required to operate the WDM photonic transport network. We introduce a TMN-based network operating system. Finally, an overview of NTT's photonic transport network trial is presented     

空芯光子晶体光纤研究新进展

空芯光子晶体光纤(HC-PCF)是新近发展起来的新一代特种光纤,具有奇特的基于光子带隙效应的导波机制与传输特性,在光波传输与控制、光信息操作与处理以及新型光子器件等领域都具有重要应用.综合评述了有关HC-PCF研究的最新进展,包括HC-PCF的模式传输、损耗机制、色散和非线性等基本特性,以及HC-PCF在高能光波光纤传输、超短光脉冲的色散与非线性传输控制、光与物质非线性相互作用、新型光信息传输功能器件等方面的应用.     

Photonic access node using optical code-based label processing andits applications to optical data networking

An ultrahigh-speed photonic access node using optical code-based photonic add-drop multiplexing (PADM) and its novel applications to optical data networking are proposed. PADM processes a photonic label of packet, which is mapped onto an optical code, and adds-drops the packet from or to the node, or bypasses the node. PADM is distinct from conventional wavelength ADM (WADM) in that it can handle traffic on a packet-by-packet basis. In the application of PADM to optical data networking, pseudo-time division multiple access (TDMA) and rate-controlled asynchronous access are proposed. The analyses and their numerical simulations of the performances are presented. The simulation results demonstrate low packet-loss probability. Their optical implementations are also demonstrated, in which exploit parallel photonic label processing shows the applicability of proposed optical data networking in an ultrahigh-speed regime     

两端镜像对称缺陷三元光子晶体的特性研究

运用光学传输矩阵理论,研究了两端镜像对称缺陷层一维三元光子晶体的光传输特性,并比较了一维三元光子晶体与一维二元光子晶体的禁带特性.数值模拟结果得出:一维三元光子晶体的禁带明显宽于二元光子晶体;且在三元光子晶体两端加相同缺陷层后,禁带展宽的同时出现了多个窄的透射峰.考察了影响透射峰的主要因素,缺陷层的折射率越大,透射峰越尖锐;缺陷层的光学厚度在500 nm到800 nm范围内,缺陷层的光学厚度越大,透射峰越尖锐,且向长波方向移动;光子晶体的周期数越大,透射峰越尖锐,且透射峰的个数增加.这种结构可用来实现多通道窄带滤波器,通过调节各个参数可得到所需要的波长以及通道数目的窄带滤波器.     

传输矩阵法分析一维光子晶体传输特性及其应用

利用传输矩阵法,设计了一维光子晶体滤波器,主要分析了缺陷层为F,结构为A(BA)~NF(AB)~MA的一维光子晶体的透过率的两个因素:A与B的厚度比和中间缺陷层.对A与B的厚度比和中间缺陷层对透射率的影响进行了计算机仿真研究,给出了一维光子晶体滤波器的设计方法.利用一维光子晶体中TM模与TE模的本征方程,针对光通信中常用的波长做了光子晶体全反射镜的设计和优化,并将一维光子晶体器件应用在卡塞格伦光学天线系统中,设计制作出一套空间光通信系统.     

双缺陷光子晶体禁带结构特性研究

用特征矩阵法研究了带有双缺陷的一维光子晶体的禁带结构特性。由于两缺陷间存在相互作用,其禁带结构的性质受到两缺陷间隔光学厚度及缺陷层折射率的影响。定义了描述两缺陷间相互作用强弱的关联系数,进而分析了关联系数与两缺陷层间相隔光学厚度及缺陷层折射率的关系。通过数值计算和计算机模拟,确定了光子晶体结构的特征间隔光学厚度。     

大面积三维光子晶体的制备与分析

采用中心带孔的多光楔棱镜产生多光束干涉图案 ,利用光诱导法在掺铁铌酸锂晶体中制作多种包括 光子准晶在内的大面积三维光子晶体。介绍了制作装置和实现方法,观测了两种光子晶体微 结构正面及侧 面结构特点,同时拍摄了光子晶体的布里渊区图。通过仿真计算定量分析光子晶体,详细分 析了三维结构 的周期性变化特点。提出通过改变光楔楔角角度实现对三维光子晶体周期的控制。利用布拉 格反射实验验证所做三维光子晶体的周期性,并测量了晶面间距。