基于全光云网新型基础设施的运营商发展策略探讨

文章从全光云网的战略背景和价值出发,构建高带宽、低时延、高安全的差异化云网,围绕全光云网新型基础设施建设的总体思路,构建1张新城网+1个全光基座+1套基础资源的架构,提出向上联云联算、向下联企联家的发展举措。政企OTN（光传送网）实现SDH（同步数字传输体制）现代化、全光楼宇的产业数字化布局。FTTR（光纤到房间）和ODN（光分配网）3.0等技术实现多联接、优体验、智慧运营的家庭数字化,助力运营商家宽、两线业务高质量发展。     

配备光缓存的OBS核心路由器性能分析

光突发交换(Optical Burst Switching,OBS)网络是下一代IP over WDM全光网络的发展趋势.文章主要研究并分析了OBS网络中配备有光缓存的核心路由器性能,给出了突发数据分组阻塞率、输出端口占用率、排队时延等性能参数.所得结果对0BS网络理论研究进行了一定的补充.     

连续可调光延迟线技术研究

光延迟线在雷达技术、全光信号处理、光通信等领域中有着广泛的用途,但是目前通用的可调光延迟线是增量可调而非连续可调的.连续可调技术大大提高了延迟精度,代表了光延迟线的发展方向.因此介绍了几种连续调谐光信号时延技术,具体分析了它们的实现原理和特点.     

一种高效的基于模式色散的全光积分器

对基于模式色散的全光积分器进行数值仿真和实验 研究,实现了一种一维展宽倾斜入射方 式的全光积分器。在模式色散的作用下,光信号经过光纤时不同的模式产生了不同的延 时,叠加后产生了积 分的效果;选用了较大面积的高速光电探测器(PD)接收多模光纤(MMF)的输出光束, 利用50m的MMF实现了时间窗口约为1.5ns的 全光积分器;最后使用该积分器对光信号进行了积分实验。由于 使用模式色散作为产生时延的主要方法,因此方法具有与波长无关的特性,而且 能在很短的光纤上获 得较大的时间窗口。一维展宽的入射方式具有很好的灵活性,易于调试和控制。     

基于PPLN波导的全光译码器的设计与研究

随着互联网的发展,网络数据流量极速增长,全光网(AON)概念的提出有利于解决可用带宽受限、信号传输速率较低等问题。其中,全光逻辑信号处理为AON的重要组成部分。根据周期性极化铌酸锂(PPLN)波导的二阶非线性效应原理,将产生的输出信号连续送入不同的PPLN波导进行叠加处理,设计出全光2线-4线译码器的波导级联结构,通过数值计算仿真得到了波形图和眼图,分析了全光2线-4线译码器输出信号的半高全宽(FWHM)、峰值功率、延迟时间和消光比。仿真结果表明:采用PPLN波导级联的方式实现了2线-4线译码器在光域中的逻辑功能,同时保证了光信号的传输质量,为PPLN波导的全光信号处理提供了新的器件类型。     

基于定长光突发数据的OBS网络性能分析

光突发交换(OBS)技术是下一代全光分组交换技术的典型代表.本文主要研究并分析了基于固定长度光突发数据的OBS网络平均时延、突发数据数量等性能,给出了各参量随信道负荷量变化时的变化规律.     

基于MEMS全光交换矩阵的设计与实现

随着全光通信网络超高速发展，光交叉连接器（OXC）的广泛应用，全光交换矩阵作为OXC中重要组成部分，广泛应用在网络光交换及光分组中。提出了一种基于MEMS全光交换矩阵解决方案，介绍了其主要组成、硬件与软件设计，并进行了主要性能指标测试。     

将用于光计算机的全光晶体管

印度Birla技术研究所的科学家研究了一一种可用于光计算机的全光晶体管。这种可执行光子功能的全光器件类似于传统的电子晶体管。将这种全光晶体管用于光子计算机来替代现今的电子计算机，可使计算机在小型化和速度方面有巨大提高，在技术方面也将获得改进，并将使科幻中的光计算变为现实。     

一种用于光组播冲突解决的节点结构及其调度策略

光分组在核心节点处的冲突解决问题是实现全光 组播分组交换的关键。本文提出了一种新型的解决光组播冲突的节 点结构,用于冲突解决的部分包括输出共享的网络编码模块和光纤延迟线(FDL)环 形反馈共享缓存(FDL-LSFB)模块。网络编码 模块将异或网络编码作为冲突解决方式,利用全光异或门将冲突组播进行网络编码并且改变 编码后分组波长,从而避免波长 冲突。而FDL-LSFB模块由子交换矩阵和FDL缓存组连接成环状,且冲突组 播可从任意子交换矩阵进出缓存模块, 使用少数的FDL可以提供大容量的光缓存、提高FDL利用率。针对FDL-LSFB模块冲突组播调 度问题,为减小缓存时延,设计了最小缓存长度级联控制算法(MLCBST),进而提出冲突光 组播的总调度策略。仿真结果表明,本文提出的组播节点结构和调度策略在降低丢包率(PLP)和减小缓存时延方面具有明显的效果。     

基于半导体光放大器非线性偏振旋转效应的全光采样

提出了一种新的基于半导体光放大器非线性偏振旋转效应的全光采样方法,利用速率方程对全光采样的理论机理进行了阐述.借助该速率方程模型对采样器的输入偏振角、偏振控制器的附加相移和偏振合束器的偏振方向等参数进行了优化设计.计算结果表明,采样器传输曲线具有较好的线性工作范围,能够实现模拟光信号的高速全光采样,且其输入泵浦光功率小于1mW.由于该全光采样的工作原理与全光波长转换类似,而目前的全光波长转换工作速率可达320Gbps,因此该全光采样的采样速率可望达到上百GS/s.     

Design of All-Optical Contention Detection and Resolution for 40-Gb/s Label-Switched Routers

We present a new scheme for all-optical contention detection and time-domain contention resolution of optical packets in label-switched routers that employ all-optical label recognition. The contention detection subsystem provides all the necessary control signals required to drive an optically controlled buffer which employs 1 times 2 optical switching elements and an optical fiber delay line. The state of the buffer is dynamically controlled on a per-packet basis with all the decisions and processing performed in the optical domain. Physical layer simulations show successful buffering and forwarding of 40-Gb/s optical packets with 2-dB power penalty     

Magnetic tunability of fiber optical parametric oscillators with optical clock extraction

A 10 Gb/s all-optical clock extraction based on magnetically controllable fiber optical parametric oscillator (MC-FOPO) is demonstrated.The operation properties of the magnetic control unit,composed of a solenoid and a magneto-optic crystal of high Verdet constant,are experimentally investigated.By adjusting the drive current of the solenoid,the magneto-optic crystal unit may serve as a tunable optical fiber delay line with polarization control to some extent.The experimental results show that the MC-FOPO is capable of repetitively magnetic tunability desirable for all-optical clock recovery.     

多抽头宽带光纤延迟线的设计与分析

提出一种具有实用价值的步进延迟可调的多抽头宽带光纤延迟线。首先简要介绍了光纤延迟线的优点、工作原理和基本结构,分析了光纤延迟线的增益、带宽、动态范围和失真指标,着重分析了多抽头宽带光纤延迟线的光纤分配网络的设计和实现。最后对设计的多抽头宽带光纤延迟线进行了测试,给出了测试方法和测试结果,并将它同国际、国内其他同类产品做了对比,描述了它的应用前景和应用领域。     

Device Design and Characteristics for SOA—based All Optical Signal 2R Regeneration

A new scheme based on SOA-MZI for all-optical 2R regeneration is proposed.The characteristics of gain and switching window of this device are investigated in detail.Numerical simulation results indicate that the nonlinear gain compression,the time delay between the input optical signal and the width of the optcial pulse are essential parameters for a good performance of all-optical 2R regeneration.     

Generation and wavelength switching of picosecond pulses by optically modulating a semiconductor optical amplifier in a fiber laser with optical delay line

A novel actively mode-locked fiber laser having a semiconductor optical amplifier playing the roles of both a gain element and an optically controlled mode-locker and eight cascaded fiber Bragg gratings playing the role of the wavelength selecting element is proposed and demonstrated. Stable amplitude equalized pulse trains with a pulsewidth about 43 ps at 2.5 GHz have been obtained by injecting optical control signals into the laser. Wavelength switching among eight wavelengths is achieved by merely tuning an intracavity optical delay line. This all-optical generation and wavelength-switching scheme should be useful in applications where picosecond pulse trains at high repetition rates are desired.     

An experimental switching-aware GMPLS-based lightpath provisioning protocol in wavelength-routed networks

In wavelength-routed optical networks, the high-delay introduced by the optical switching fabric for resource reservation increases critically the lightpath setup delay. In order to minimize the setup delay, Generalized Multi-protocol Label Switching (GMPLS) introduced the concept of Suggested Label Object (SL), which allows to start reserving and configuring the hardware with a proposed wavelength from the source node to the destination node. This solution is not optimal in wavelength selective networks (WSN) (i.e., without wavelengths converters). The need of guaranteeing the wavelength continuity constraint for end-to-end optical connections, combined with the lack of global wavelength-based link information (the source node is not aware of which wavelengths are available on each link), makes that the likelihood of establishing a lightpath using the proposed suggested label may be minimum. In this article, we propose an enhancement to the current GMPLS RSVP-TE signaling protocol with offset time-based provisioning that minimizes the lightpath setup, improving the overall network performance in terms of blocking probability and setup delay. Experimental performance evaluation has been carried out in ADRENALINE testbed, a GMPLS-based intelligent all-optical transport network.     

基于半导体光放大器的超快全光波长转换

本文介绍了在基于半导体光放大器的高岛速全光波长转换中的速度受限现象,以及导致速度受限的主要原因——半导体光放大器的载流子寿命．将国内外学者所采用的各种提高基于半导体光放大器的全光转换速度的主流方案归纳总结为三种类型,对其进行简要的阐述,并分别分析其优势及不足。     

All-optical filter for simultaneous implementation of microwave bandpass and notch responses based on semiconductor optical amplifier

An all-optical filter structure to simultaneously implement microwave bandpass and notch filter is proposed and experimentally demonstrated. The structure is based on a recirculating delay line (RDL) loop consisting of a semiconductor optical amplifier (SOA) followed by a tunable narrowband optical filter and a 10:90 coupler. The converted signal is generated in a wavelength conversion process based on cross-gain modulation of amplified spontaneous emission in the SOA. The converted signal circulating in RDL loop realizes a negative bandpass response. The negative bandpass filter and a broadband allpass filter are synthesized to achieve a notch filter with flat passband which can excise interference with minimal impact on the wanted signal.     

All-optical signal processing in ultrahigh-speed opticaltransmission

The coming broadband era will require very high-speed technologies that can handle more than 100-Gb/s for both transmission lines and transmission nodes. Novel all-optical signal processing technologies that offer unsurpassed performance are urgently required. This article briefly reviews the essential photonic technologies required for high-speed optical TDM transmission, including ultrashort optical pulse generation, all-optical multiplexing/demultiplexing, and optical timing extraction techniques. Recent all-optical TDM transmission experiments up to 100 Gb/s are introduced together with major issues and future prospects