18 Gchips/s electronically-processed OCDMA spread spectrum for access networks

We demonstrate for the first time coding/decoding for OCDMA networks using electronic transversal filters at 18Gchips/s-a ten-fold improvement over previous demonstrations. The chip rate allows users at Gb/s rates in access applications. © 2007 Optical Society of America.

多级多版本数据库管理系统全局串行化

多级调度应该保证事务历史可串行化,满足多级安全特性,不会引入隐通道,并保证高级别事务不会因为无限等待而"饿死".与其他多级数据管理系统调度机制相比,多级多版本时戳调度机制满足上述要求,但该机制存在两个问题,一是事务可能读旧版本,二是要求调度器是可信进程.提出一种多级多版本全局时戳调度机制(MLS_MVGTO),以及依据事务快照生成其全局时戳的基本步骤.给出了预知只读事务信息时的两种改进方法.MLS_MVGTO机制生成的事务历史可串行化,不引入隐通道等,并且该方法避免引入一个全局可信的调度器,并通过对只读事务的深入分析,允许事务读新版本.

1×8阵列波导光栅型波分复用/解复用器设计的一种简单方法

用有效折射率法，采用近轴近似和波导模场分布的高斯近似，简化了阵列波导光栅(AWG)器件的设计过程中繁杂的计算，且保证了器件的性能指标。给出了设计思路，并给出了1×8路、中心波长为1550.9nm，波长间隔为1.6nm的AWG波分复用/解复用器的设计实例。

Optim ization of a 1×8 Arrayed-Waveguide Grating Multi/Dem ultiplexer

于2010-11-23批量导入

Flat Surface Plasmon Polariton Bands in Bragg Grating Waveguide for Slow Light

The formations of the surface plasmonpolariton (SPP) bands in metal/air/metal (MAM) sub-wavelength plasmonic grating waveguide (PGW) are proposed. The band gaps originating from the highly localized resonances inside the grooves can be simply estimated from the round trip phase condition. Due to the overlap of the localized SPPs between the neighboring grooves, a Bloch mode forms in the bandgap and can be engineered to build a very flat dispersion for slow light. A chirped PGW with groove depth varying is also demonstrated to trap light, which is validated by finite-difference time-domain (FDTD) simulations with both continuous and pulse excitations.