基于FBG的新型双向传输可调谐光分插复用器

提出了一种基于FBG(光纤布拉格光栅)的新型双向传输可调谐光分插复用器,同时对该结构的复用解复用原理进行了阐述,通过Optisystem软件验证了结构设计和理论分析的可行性。仿真结果表明,下载波长的边模抑制比在20dB左右。这种器件具有灵活度高、器件利用率高等特点,在波分复用系统中两条线路互为冗余,提升了系统的容错性,有望在光网络中得到应用。     

双向波长上下路光分插复用器

通过对科技文献的归纳总结和分析比较,介绍了四种实现双向波长上下路的光分插复用器结构和工作原理,它们是：（1）基于FBG和多口光环形器;（2）基于波导光栅路由器和FBG;（3）基于阵列波导光栅（AWG）;（4）基于解复用器／复用器对和光开关的OADM结构。     

光网络中的动态可重构的光分插复用技术

动态可重构的光分插复用器(ROADM)在光通信网络与传感网络中有重要的应用,而且是对目前正在使用的非重构的光网络升级的核心技术之一.超大规模、高可靠性的传感器网络对可重构的OADM需求尤其迫切.结合本课题组承担的863项目的研究成果,对该技术进行介绍.     

空间级联可调谐光滤波器方式实现光分插复用器

提出一种采用空间级联可调谐光滤波器方式实现的OADM.该器件不但具有集成度高、体积小、插入损耗低、信道间插入损耗差异小的特点,而且能够在控制电路的作用下灵活选择上下路波长及其数量,为构建灵活、高性能的WDM网络提供了选择.     

Parallel-stage-based reconfigurable optical add-drop multiplexer for WDM optical transport networks

This letter proposes a simple and flexible reconfigurable optical add-drop multiplexer (ROADM) based on parallel-stage configuration using Mach-Zehnder-based fiber gratings, 1/spl times/2 optical switches, and Y-model combiners. The proposed ROADM with four-stage parallel configuration is designed and experimentally investigated to show its performance in full wavelength selection and advantages in reducing the discrepancy of the insertion loss between channels and upgrading.     

High-performance operation of monolithically-integrated multipurpose reconfigurable optical add-drop multiplexer

WDM operation of a novel monolithically-integrated 16-channel reconfigurable add-drop multiplexer (ROADM), demonstrating high crosstalk suppression and cascadability to eight nodes for 10 Gbit/s NRZ signals, is reported. The device provides separate wavelength add/drop ports and a common wavelength-multiplexed add/drop port for high system functionality.     

InP-InGaAsP wafer-bonded vertically coupled X-crossing multiplechannel optical add-drop multiplexer

A vertically coupled InP-InGaAsP crossed waveguide optical add-drop multiplexer has been realized through the use of wafer bonding. Designed for signals in the 1550-nm range, this novel device requires only a single epitaxial growth and illustrates the use of vertical optical interconnects for the three dimensional routing of optical signals. To our knowledge, it is also one of the first optical vertically coupled devices with no horizontally coupled counterpart     

城域网中可重构型分插复用器的新发展

城域光网络的升级对可重构型分插复用器(ROADM)技术的发展产生了巨大的推动作用.分析和归纳了当前ROADM产品的特点和应用,指出了ROADM发展的新动向和市场前景.     

Highly stable optical add/drop multiplexer using polarization beam splitters and fiber Bragg gratings

We demonstrate a novel wavelength-division add/drop multiplexer employing fiber Bragg gratings and polarization beam splitters. The multiplexer is easy to fabricate without any special technique such as UV trimming, and yet shows very stable performance with less than 0.3-dB crosstalk power penalty in a 0.8-nm-spaced, 2.5-Gb/s-per-channel wavelength-division multiplexing (WDM) transmission system.     

ROADM分布式管理系统的实现(本期优秀论文)

管理系统是保证可重构光分插复用设备(ROADM)稳定性、灵活性的重要元素.利用SNMP协议建立一个ROADM设备的网元管理系统,再利用CORBA使这个管理系统向上提供北向接口,使其能够用于分布式网络管理系统中.系统采用Java语言实现.     

Integrated laser and add-drop optical multiplexer for narrowband wavelength division multiplexing

The fabrication and characterisation of a monolithically integrated narrowband add-drop multiplexer and DBR laser are reported. Multiplexer bandwidth of 2-3.5 nm have been measured with a Bragg extinction ratio >23 dB.<>     

三维集成光分束器的研究进展

三维集成光分束器在保持二维集成光学器件的可靠性和结构稳定性的基础上,有效扩大了单个芯片上的通信信道数,增加了集成密度,缓和了二维平面结构输入输出困难等问题。文章对三维集成光分束器的研究进展进行了概述,详细介绍了已有的三维集成光分束器的结构及制作方法,并对其性能进行了比较。最后,展望了三维集成光分束器的应用前景。     

First InP-based reconfigurable integrated add-drop multiplexer

A four-channel reconfigurable integrated add-drop multiplexer on InP-substrate is reported. The device consists of a 5/spl times/5 PHASAR demultiplexer integrated with Mach-Zehnder interferometer electrooptical switches. Total device size is 3/spl times/6 mm/sup 2/. All routing configurations of four wavelengths have been demonstrated. Crosstalk values are better than -20 dB. On-chip loss for the dropped or added signals and for the signals coupled from the input to the output port are lower than 7 and 11 dB, respectively.     

All-fiber add-drop wavelength-division multiplexer based onintermodal coupling

We demonstrate a novel all-fiber add-drop multiplexer by using a tilted Bragg grating written on a two-mode fiber and a mode-selective coupler. The device can be made potentially with low loss and low cost, useful for add-drop of a small number of channels in wavelength-division-multiplexing (WDM) communication systems     

Super compact optical add-drop multiplexer for FTTH applications based on low-loss polymer waveguide materials

Four- and eight-channel arrayed-waveguide grating (AWG) and fixed optical add-drop multiplexer (OADM) devices with channel spacing of 1200 and 600 GHz have been fabricated using super-high refractive index contrast (/spl Delta/n=0.020) triazine containing polymers. Accordingly, the size of the four-channel AWG was only 10/spl times/3 mm and the insertion loss was 3 dB.     

OTDM add-drop multiplexer based on time-frequency signal processing

A time-division add-drop multiplexer capable of high-extinction-ratio operation is presented both theoretically and experimentally. The approach used is based on time-to-frequency domain conversion of optical signals and relies upon the switching of linearly chirped optical pulses. By converting a 40-Gb/s optical time-division multiplexing (OTDM) signal to 4 /spl times/ 10-Gb/s wavelength-division multiplexing (WDM) channels and using fiber Bragg gratings for frequency-domain add-drop multiplexing, a timeslot suppression ratio in excess of 30 dB and error-free operation for the dropped, through, and added channels were achieved. A further stage of WDM-to-TDM signal conversion was used to map the resulting signal back into the time domain. Moreover, it is shown that it is straightforward to simultaneously operate on multiple channels by simply cascading gratings to make more complex filtering functions without the requirement for any further synchronization of the tributary channels.     

Miniature tunable Airy beam optical meta-device

Tunable Airy beams with controllable propagation trajectories have sparked interest in various fields,such as optical manipulation and laser fabrication.Existing research approaches encounter challenges related to insufficient compactness and integration feasibility,or they require enhanced tunability to enable real-time dynamic manipulation of the propagation trajectory.In this work,we present a novel method that utilizes a dual metasurface system to surpass these limitations,significantly enha...     

Anticrosstalk arrayed-waveguide add-drop multiplexer with foldbackpaths for penalty free transmission

A novel optical add-drop multiplexer based on an arrayed-waveguide wavelength multiplexer is proposed. The foldback configuration is employed to avoid the bit error rate degradation caused by the light crosstalk common in arrayed-waveguide multiplexers. Penalty free transmission is demonstrated     

Design and feasibility analysis of an innovative integratedgrating-assisted add-drop multiplexer

An integrated optical add-drop multiplexer (OADM), based on a symmetric coupler with a superimposed innovative grating, is proposed. The device has, theoretically, no backreflection at the input and add ports, and does not require a critical positioning of the grating, thus simplifying device fabrication and allowing thermal tuning. Simulations for a glass-on-silica technology show the excellent performances of the proposed device, and the analysis of the sensitivity highlights the specifications that have to be met in the fabrication tolerance