考虑耦合器附加相移光纤环形腔精细度计算

从理论上导出了考虑耦合损耗引起的附加相移后光纤环形腔的带阻输出特性。分析表明 ,附加相移对环形腔谐振频率的影响可以忽略 ,对腔内光强的其它频率特性没有影响。但使输出特性中的谐振峰出现不对称 ,计算结果证明谐振峰半功率全宽较之不考虑损耗引起的附加相移时增大 ,精细度由此而有所下降 ,附加相移越大 ,精细度下降越多。     

二频机抖激光陀螺抖动频率与温度关系的研究

针对激光陀螺的零偏受温度影响较大,为提高陀螺精度,研究了二频机抖激光陀螺抖动频率与温度之间的关系。通过大量的重复性高低温实验,证明了抖动频率与温度的线性关系,并得到了拟合直线表达式。结果表明,抖动频率与温度具有较好的线性关系,抖动频率可作为温度测量的计量,而且具有较好的重复性。由于测量抖动频率的精度较高,故由抖动频率测量温度具有很高的分辨率。同时用抖动频率对陀螺的零偏进行补偿,提高了陀螺的精度。     

垂直腔面发射激光器中选择性氧化工艺稳定性研究

选择性氧化工艺已经成为制备高性能垂直腔面发射激光器(VCSEL)的关键技术,氧化后形成的氧化层提供了良好的电限制和折射率导引,但选择性氧化速率是呈线性规律还是抛物线规律仍存在很大的争议.在多种温度条件下,做了环形沟槽和环形分布孔的氧化实验,这是在垂直腔面发射激光器中采用的两种结构.实验结果表明,氧化窗口形状对氧化速率的影响也依赖温度条件,并对这种实验现象给出了定性解释.     

可编程控制波长调谐的环形掺铒光纤激光器

提出了一种新型的可调谐光纤激光器,器件采用介质薄膜干涉滤波器进行波长可编程调谐,调谐范围超过38 nm(1 526.5～1 564.6 nm),中心波长可精确调谐到C波段指定的ITU-T波长栅格的标准中心波长处,3 dB带宽小于0.08 nm,25 dB带宽小于0.22 nm,波长稳定性优于0.01 nm,边模抑制比大于60 dB,最大输出光功率35.6 mW,功率稳定性优于±0.02 dB,阈值泵浦功率和斜率效率分别为5.8 mW和36.6%.     

Hilbert-shaped complementary single split ring resonator and low-pass filter with ultra-wide stopband, excellent selectivity and low insertion-loss

A novel Hilbert-shaped complementary single split ring resonator (H-CSSRR) with an alterative split gap was initially presented and studied. Transmission characteristics of several CSSRR cells were assessed by full-wave electromagnetic (EM) simulation and analyzed by electrical simulation (equivalent circuit model). Miniaturization mechanism as well as effective EM parameters retrieval is also involved. Comparing to conventional CSSRR, proposed H-CSSRR was demonstrated with a merit of lower primary transmission zero realized by negative effective permittivity and multi-resonance behavior attributing to self-similarity of Hilbert geometry. For application, a tunable assembled low-pass filter (LPF) by periodically loading H-CSSRR cells and open stubs is designed, fabricated and measured. Measurement results indicate that the designed LPF has many good performances such as relative low insertion loss (maximum 0.59 dB) in passband, ultra-wide stop-band characterized by 20 dB insertion loss (from 2.45 to 25 GHz) as well as steep rejection with sharp transition band (2.15–2.45 GHz) out of band. Excellent property and consistent numerical and experimental results of the developed LPF have confirmed the effectiveness of this design concept.     

新的无向双环网络G(N;±1,±s)直径求解方法

提出新的无向双环网络G(N;±1,±s)的直径求解法——分步法,并得到一种新的直观图——螺旋环,研究了螺旋环的性质,给出无向双环网络的直径d(N;±1,±s)的显式公式,给出N,s都固定的直径算法。给出N固定,2≤s≤N?1这样一族无向双环网络的直径算法。利用VB6.0和SQL Server 2000来仿真2≤s≤N?1,找出了该族无向双环网络直径的分布特点:具有最大值、最小值和中间对称性;对任意N,有不少s使得G(N;±1,±s)紧优或几乎紧优。验证了Boesch和Wang等提出的无向双环网络G(N;±1,±S)的直径下界,给出了一个新的直径上界公式。     

PTN网络环网保护技术研究

从提出和分析PTN网络保护技术现状问题出发,总结PTN环网保护对运营商的重要意义。通过研究PTN环网保护技术的原理和实现机制,对不同技术方案、技术标准的优缺点进行分析总结,同时也提出了笔者自己的观点和看法,提出了环网保护技术配置方案建议,最后对环网保护技术及PTN网络未来发展趋势进行了展望。     

光纤工业控制网的研究

本文介绍了电路交换和分组交换相结合的新型光纤工业控制环网的设计与研究,着重考虑了环网的拓扑结构、体系结构、ＭＡＣ协议、帧结构和混合环路控制。     

浅析城域光传输网络的规划和设计

介绍了城域光传输网络的基本概念和组网结构,归纳了浙江省城域光传输网的建设现状。以此为基础,简要地总结了城域光传输网从环状网络向网状网络的演进趋势以及城域光网建设的规划原则。     

A new synchronous digital hierarchical Bi-directional ring capacity design algorithm based on the shortest-route traffic matrix

In this paper, the concept of the Shortest-Route Traffic Matrix(SRTM) was first presented, and the generalized formula for computing ring capacity requirement in use of SRTM is given. Then, a new capacity design algorithm which is based on SRTM was presented for Synchronous Digital Hierarchical(SDH) Bi-directional Self-Healing Ring (BSHR). The algorithm simulation results demonstrate that this algorithm is very efficient for SDH BSHR capacity design and can make less project investment and make high utilization of lines and equipment. By means of the algorithm in this paper, capacity optimization assignment for SDH Hierarchical Self-Healing Ring (HSHR) and for ATM Virtual Path (VP)-based Self-Healing Ring (SHR) is also discussed.