1 上海交通大学 区域光纤通信网与新型光纤通信系统国家重点实验室, 上海 200240
2 浙江工业大学 信息工程学院,杭州 310023
基于光子晶体单向传输波导,设计了一种三端口和两种四端口结构的通道下路滤波器.为取得100%的通道下路效率,运用实时耦合模理论对这三种结构进行了分析.理论分析表明该通道下路滤波器比利用光子晶体普通介质波导设计的通道下路滤波器具有更简单的结构,降低了器件制作难度.用有限元方法对滤波器结构进行了数值仿真分析,仿真计算结果表明所设计的三种结构具有超过90%的通道下路效率,与理论分析结果相符合.
集成光学 有限元方法 光子晶体 光子带隙 通道下路滤波 光子晶体单向波导 通道下路效率 耦合模理论 Optical communication Integrated optics Finite element method Photonic crystals Optical band gaps Channel drop filter Photonic crystal oneway waveguide Channel drop efficiency Coupled mode theory
Author Affiliations
Abstract
1 College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China
2 College of Computer Science and Technology, Zhejiang University of Technology, Hangzhou 310023, China
3 State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China
We design a compact triplexer based on two-dimensional (2D) hexagonal lattice photonic crystals (PCs). A folded directional coupler (FDC) is introduced in the triplexer beside the point-defect micro-cavities and line-defect waveguides. Because of the reflection feedback of the FDC, high channel drop efficiency can be realized and a compact size with the order of micrometers can be maintained. The proposed device is analyzed using the plane wave expansion method, and its transmission characteristics are calculated using the finite-difference time-domain method. The footprint of the triplexer is about 12×9 μm, and its extinction ratios are less than –20 dB for 1310 nm, approximately –20 dB for 1490 nm, and under –40 dB for 1550 nm, making it a potentially essential device in future fiber-to-the-home networks.
三重波分复用器 二维六角晶格光子晶体 折叠定向耦合器 250.5300 Photonic integrated circuits 230.5750 Resonators 230.7370 Waveguides Chinese Optics Letters
2011, 9(4): 042501
Author Affiliations
Abstract
1 Institute of Fiber Optic Communication and Information Engineering, College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China
2 State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China
A novel polarization channel drop filter (PCDF) based on two-dimensional (2D) photonic crystals (PCs) is presented. It consists of two line defect waveguides and two point defect micro-cavities. In the line-defect waveguides, the transverse-electric (TE) and transverse-magnetic (TM) polarization lights are guided using photonic band-gap and total internal reflection effect, respectively. The light at the resonant frequency for TE polarization can be transferred from one waveguide to the other using the proposed system. Compared with the existing four-port PCDF based on PCs, the three-port structure can realize a multi-channel wavelength system of PCDF more easily and can be an essential device in future polarization wavelength division multiplexing (PWDM) systems.
光子晶体 偏振通道下路滤波器 偏振波分复用系统 250.5300 Photonic integrated circuits 230.5750 Resonators 230.7370 Waveguides Chinese Optics Letters
2010, 8(8): 749
Author Affiliations
Abstract
State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240
We optimize the novel configuration of a hybrid fiber amplifier-Raman assisted-fiber-based optical parametric amplifier (R-FOPA), in which the parametric gain and Raman gain profiles are combined to achieve a flat composite gain profile. The pump powers and the fiber length in the hybrid amplifier are effectively optimized by genetic algorithm (GA) scheme. The optimization results indicate that the R-FOPA can achieve a 200-nm flat bandwidth spectrum with the gain of 20 dB and ripple of less than 4 dB.
参量放大器 拉曼散射 遗传算法 190.4970 Parametric oscillators and amplifiers 290.5860 Scattering, Raman Chinese Optics Letters
2008, 6(5): 327
针对多粒度应用，开发了一种用于流量疏导的波群模型，并引入一种基于此模型的新型智能交换结构．该光交换结构提供了独特的区分粒度到相应隧道进行有效处理的方法．此外，还讨论了控制层粒度分离时采用的两个关键的动态算法模块．仿真结果显示这种特殊的通道分离方法有效提高了处理动态连接请求时每个光路径的平均信号通道质量和阻塞性能．
多粒度交换 通用多协议标记交换 流量疏导 波群 执行域 Multi-granularity switching GMPLS Traffic grooming Lambda-group Execute area
Center for Broadband Optical Networking Technology,Shanghai Jiao Tong University, Shanghai 200030, China
Chinese Journal of Lasers B
2002, 11(4): 246
中国科学院上海光学精密机械研究所,上海 201800
在国外报道的一些掺镱;Yb3+ 激光玻璃基础上,实验研究得到发射截面更大的掺Yb3+玻璃。其中掺Yb3+锗碲酸盐、硼酸盐和硅铌酸盐玻璃的发射截面大于1.9 pm2;磷酸盐玻璃的发射截面较小但有较长的荧光寿命。优良的光谱性质使这些玻璃有望成为高平均功率和高峰值功率激光器增益介质的候选基质.
发射截面 氧化物玻璃
研究了熔炼温度和气相反应剂(CCL4，SOCL2和pOCL3)对BAO-p2O5(n21)和Ｒ2O-BAO-p2O5(HLC-5)系统磷酸盐激光玻璃RAp法除水速率的影响.讨论了n21和HLC-5型玻璃中Nd3＋的荧光寿命与OH基含量的关系，井对除水前后玻璃的激光性能和物理性质进行了比较。
磷酸盐激光玻璃 RAp法 气相反应剂 除水
用吸收光谱法研究了R2O—BaO—P2O5系统磷酸盐激光玻璃中铂颗粒密度与铭的氧化还原平衡的关系。结果表明,玻璃中铂颗粒密度随平衡向右移动而减小;玻璃中平衡随熔炼气氛中氧分压增大、熔炼温度升高而向右移动,当足够大时,铂颗粒不能形成。
磷酸盐激光玻璃 铂颗粒 氧化还原平衡
