传输损伤

WDM光网络中基于传输损伤的公平RWA算法

Fair RWA Algorithms Based on Transmission Impairments for WDM Optical Networks

本文提出了一种具有纠错功能的微机化时分多路复用（TDM）方案，并从数字传输损伤角度系统地对该方案进行了性能分析评价。

In this Paper , a microcomputer-based time-division multiplexing system ( TDM ) with error-correcting function has been developed and its performance analysis has been made systematically from the point of view of digital transmission impairments .

色散管理和相位共轭（OPC）是两种能有效抑制非线性传输损伤的技术。

Dispersion management and optical phase conjugation ( OPC ) are two techniques of suppression of the nonlinear impairment .

SDH指针调整引起的抖动是SDH网中重要的传输损伤，如何抑制指针调整引起的抖动已经成为SDH系统设计中一个关键的问题。

The jitter induced by pointer adjustment is one of the main impairments in SDH network , how to reduce it is a key problems in SDH system design .

同时还提出了新型的基于业务分级的RWA定式，开发了一套具有友好人机交互界面的仿真软件，可实现对资源动态配置、业务分级以及链路传输损伤的计算机仿真。

According this model , GUI-based simulation software is developed , which can implement the simulation of resource dynamic allocation , traffic classification and link impairment calculation .

在简要介绍数字信号相位抖动和漂移的基本概念之后，重点阐述对于准同步数字序列/同步数字序列（PDH/SDH）网络的相位抖动和漂移所带来的传输损伤，并介绍ITU-T最新建议O。

Firstly , This paper presents the basic conceptions of the Jitter and the Wander , and describes the transmission impairment caused by the Jitter and the Wander . Then , emphatically introduces the new ITU T recommendation O.

其中新型调制格式是减轻传输损伤，提高频带利用率的一种重要手段。

Some modulation formats may overcome the transmission limitations and improve spectral efficiency .

光放大系统的传输损伤

Transmission Impairments for optical Amplified Systems

采用新型的光调制和光复用技术可以有效地抑制这些传输损伤的影响，成为高速光传输系统的关键技术之一。

Novel modulation and multiplexing techniques are key technologies which could mitigate the transmission impairments in optical transmission system .

然而信号速率的提升，光纤波道带来的传输损伤也愈加明显。

However , the upgrade of signal bit rate will bring about several more obvious transmission injury in optical fiber .

新型调制格式可有效抑制传输损伤的影响，因此成为40Gb/s系统的关键技术之一。

The new modulation format is one of the key technologies of 40Gb / s system because of its capability in mitigating transmission impairments .

光信号的传输损伤来源于光纤色散、非线性效应、偏振模色散、节点串扰、放大器噪声等，对传输损伤的评估需要建立光信号与各个网络器件的模型。

Transmission impairments originate from chromatic dispersion in fibers , nonlinear effects , polarization mode dispersion , node crosstalk , noise introduced by optical amplifiers , etc. The evaluation of transmission impairments requires modeling of every network component .

光采样在高比特率信号的波形和眼图测量、相位调制信号的星座图测量、偏振态时域分辨测量和光纤传输损伤研究等方面得到广泛应用。

Applications of optical sampling systems include high bit rate waveform and eye diagram measurements , measurements of constellation diagrams of phase modulated data signals , time-resolved measurements of the state-of-polarization as well as investigations of fiber transmission impairments .

由于光网络物理结构本身导致的信号传输损伤，使得进行网络资源分配与控制的节点管理模块在进行路由与波长分配时必须考虑物理层的特性，以保证网络的可靠性与服务质量。

Due to transmission impairment caused by the physical layer , routing and wavelength assignment algorithm for network management must take the performance of physical layer into account in order to guarantee the reliability of network and the quality of services .

放射外科所用高能X射线必须提供毫米以下精度的能量传输才能避免损伤周围器官和健康组织。

High X-ray doses prescribed for radiosurgery must be delivered with sub-millimetre precision to avoid damaging nearby organs and healthy tissue .

生物组织光热传输和热损伤的研究

Study on Photothermal Transfer and Thermal Damage of Bio - tissues

主要介绍了数字微波传输中无损伤切换的作用和基本原理。

The function and principle of hitless switch in digital microwave system are introduced .

但随着传输速率的提升，40Gb/s系统的传输损伤对信号的影响也更加严重，包括色度色散、非线性效应、偏振模色散、放大器自发辐射噪声、串扰等。

Transmission at so high speed must be severely limited by transmission impairments which include group-velocity dispersion ( GVD ), polarization mode dispersion ( PMD ), fiber nonlinear effects , Amplified Spontaneous Emission noise ( ASE ) from optical amplifiers , crosstalk and so on .

高级光调制技术作为高速、长距离光传输系统的关键技术之一，可以明显减轻系统的传输损伤，并且不需要对现有的传输线路作大的修改，具有很高的商业价值。

As one of the key technologies of high-speed long-haul optical transmission system , modulation format could mitigate transmission impairments without great changes in the existing transmission lines .

码型调制格式作为高速光传输系统研究的关键技术之一，可以有效地降低传输系统的传输损伤，提高系统的抗色散能力和抗非线性效应能力，改善高速光通信系统的传输性能和频谱效率。

The code modulation formats , as one of the key technologies studied in high-speed optical fiber communication systems , can effectively reduce the transmission impairments , enhance the anti-dispersion and anti-nonlinear-effect capability and improve the transmission performance and spectrum efficiency .

提出新的基于物理层损伤约束的动态路由与波长分配算法，分析了在实际的传输系统中光功率、偏振模色散和光信噪比对光信号传输的损伤。

The factors were investigated in optical transmission including the optical power , PMD and OSNR . A novel algorithm named Physical-Layer Considerations Dynamic Routing and wavelength assignment ( PCDRWA ) was developed .

目前，高速光传输系统正在向着单信道40Gb/s的方向发展，信道容量提高的同时，所带来的传输损伤也更加严重。

At present , high-speed optical transmission system is in the direction of single-channel 40Gb / s. With the improvement of channel capacity , optical signals suffer more and more transmission impairments .

随着光通信传输系统朝着高速率、大容量、长距离的方向发展，高速光纤通信系统受到光纤的色散、非线性效应等传输损伤的严重影响，降低了系统的传输性能。

As they developing towards high speed , large capacity and long distance , the high-speed optical communication systems are badly infected by transmission impairments such as fiber dispersion and nonlinear effect hence goes down the transmission performance .

光放大器（OA）的出现和发展是超高速SDH传输系统和超大容量波分复用（WDM）传输系统得以迅速发展的主要技术推动力量，然而也随之带来了一系列传输损伤。

Occurrence and development of optical amplifiers ( OA ) are major technology driving forces for ultra-high bit rate SDH transmission systems and ultra-large capacity WDM transmission systems . However , OA also bring a series of transmission impairments .

但是，随着传输速率的提升，系统的色散、非线性效应等问题对信号的影响也更加严重。高级光调制格式可以有效地抑制这些传输损伤的影响，成为40Gbit/s系统的关键技术之一。

However , high transmission rate would cause damage on the quality of the signal , such as dispersion , non-linear effects and so on . Advanced modulation format is one of the key technologies of 40Gbit / s system because of its capability in mitigating transmission impairments .

但是随着传输速率和信道容量的提高，40Gb/s传输系统同时面临着光纤群速度色散（GVD）、偏振模色散（PMD）、非线性效应等严重的传输损伤。

However , with the improvement of transmission rate and channel capacity , transmission system meet transmission impairments caused by group-velocity dispersion ( GVD ), polarization mode dispersion ( PMD ), fiber nonlinear effects and so on .