光时分复用技术

时分复用（ＯＴＤＭ）技术是实现超高速传输的很有交的技术。本文论述了ＯＴＤＭ的主要技术及其前景，通过对ＯＴＤＭ技术在点对点通信系统对网络系统中的应用介绍，提出了ＯＴＤＭ和ＷＤＭ的结合是将来网络发展的方向。     

超高速OTDM进展及Tbit/s级可行性分析

介绍了高速光时分复用（ＯＴＤＭ）的关键技术,总结了ＯＴＤＭ光传输的最新进展,对实现Ｔｂｉｔ／ｓ　ＯＴＤＭ光纤 通信的可行性和关键技术做了分析。     

全光光孤子WDM到OTDM转换的概念系统

提出了在未来的光孤子波分复／时分复用网络中由ＷＤＭ到ＯＴＤＭ节点处的转换复用的概念系统，主要的模块是完成波长转换的基于交叉增益调制的半导体光放大器，同步和延时及时分复用模块。通过ＳＯＡ可以实现全光的ＷＤＭ到ＯＴＤＭ的波长转换复用，是ＷＤＭ／ＯＴＤＭ网络实用化的一个关键部分。     

TDMAX和FASTCOM──用于国内和企业通信的新型卫星系统

ＴＤＭＡＸ和ＦＡＳＴＣＯＭ──用于国内和企业通信的新型卫星系统Ｊ．Ｃｏｕｅｔ等“ＴＤＭＡＸａｎｄＦＡＳＴＣＯＭ－ＮｅｗＳａｔｅｌｌｉｔｅＳｙｓｔｅｍｓｆｏｒＤｏｍｅｓｔｉｃａｎｄＣｏｒｐｏｒａｔｅＣｏｍｍｕｎｉｃｃａｔｉｏｎｓ，”Ｅｌｅｃｔｒｉｃａｌ...     

卫星TDMA系统的时域逆向解调器

本文介绍了用于中速率ＴＤＭＡ系统中的一种新型解调器ＴＲ－ＭＯＤＥＭ，该方案所需报头短，需８—１６比特，并能以相干方式对各分帧进行解调。在本文中还提出了在ＴＤＭＡ系统中对各分帧分别实现各自的ＡＦＣ与ＡＧＣ算法，而不是对所有的分帧一起处理，它易于采用全数字技术，实现中速率的ＴＤＭＡ解调。该调制解调器可应用在卫星ＴＤＭＡ通信系统中。     

高速时分复用光通信及其关键技术

扼要评述光学时分复用通信研究的现状，重点介绍了ＯＴＤＭ通信系统的光源，传输，全光型时钟提取和解复用等关键技术。指出其发展趋向和光学孤子在信号处理中和重要意义。     

波分复用（WDM）和光时分复用（OTDM）系统的技术进展

本文叙述了两种多信息通信系统：波分复用（ＷＤＭ）和光时分复用（ＯＴＤＭ）系统的最新技术进展。     

无线宽带通信系统

本文重点介绍了无线宽通信系统的宽带接入技术如无线ＬＡＮ，无线ＡＴＭ，ＬＭＤＳ和ＭＭＤＳ。另外，还介绍了以ＴＤＭＡ和ＣＤＭＡ为基础的多媒体无线通信中的新技术，如自适应调ＯＦＤＭ／ＳＳ等。     

光时分复用系统

介绍光时分复用（ＯＴＤＭ）超高速光通信系统的构成和基本原理，以及其在国内外的发展状况和趋势。全光时分复用／去复用（ＭＵＸ／ＤＥＭＵＸ）技术作为构成ＯＴＤＭ超高速光通信系统的关键技术，在此作了重点介绍。     

宽带无线TDMA系统的自适应调制技术

无线多媒体业务的快速增长促进了宽带无线ＴＤＭＡ通信系统的研究和开发,宽带无线ＴＤＭＡ通信系统方面出现了一些新的技术和系统设计概念。讨论宽带无线ＴＤＭＡ系统中采用的自适应调制技术。     

脉幅有序变化OTDM信号的支路及群路全光时钟提取

将含暗帧脉冲的 4× 2 .5GHz的光时分复用 (OTDM)信号注入一含半导体光放大器 (SOA)的锁模光纤激光器 ,利用SOA的交叉增益调制效应 ,提取出 2 .5GHz的支路时钟信号和 5GHz,10GHz的群路时钟信号 ;群路时钟的提取机制是有理数谐波锁模机制。光时分复用信号采用暗帧脉冲不但可以用来识别支路信号 ,而且显著提高了支路时钟信号的质量     

OTDM中时钟提取技术的发展及前景

光时钟提取是光时分复用的关键技术之一，得到了广泛的关注。目前，OTDM系统中用于时钟提取的技术方案有多种，本文对各种光时钟提取技术进行了综述和分析，并对其发展前景进行了展望。     

In-band clock distribution concept for ultra-high bit rates OTDM system

A novel clock distribution concept based on inband phase-modulated pilot insertion is demonstrated.This method avoids the need for an ultrafast phase comparator and a phase-locked loop in the receiver.Experimental results show that the clock can be successfully extracted from 160Gbit/s optical time-division multiplexing (OTDM) data signal and employed for demultiplexing of 40Gbit/s tributaries.The in-band clock distribution introduces 1.5dB of power penalty with an error-free performance.     

4×10Gb/s OTDM复用与解复用结构优化技术研究

基于40Gb/s OTDM复用结构,利用电吸收调制器(EAM)及时钟提取模块组成的解复用模型,实现了10GHz时钟分量的提取和信号的解复用.针对OTDM复用后信号的非等幅现象以及对应频谱中含有10GHz、20GHz等其他频谱分量的情况,进行了仿真分析及讨论.同时通过实验对不同的时钟提取与解复用结构提取出的时钟信号的质量进行了对比,优化了解复用结构,得到了抖动更小的帧时钟信号.     

从非均匀分布的信号脉冲中提取基频时钟脉冲

提出从接收到的光信号脉冲串中提取光基频时钟的方案。此方案的要点是 :首先在光脉冲的复用过程中人为地使复用后相邻码的时间间隔不相等 ,即复用为非均匀码。其次 ,在接收端利用光纤环形锁模激光器提取与复用前原信号同频率的时钟脉冲。实验的初步结果及理论分析表明所提出的时钟提取方案是可行的。     

160-Gbit/s clock recovery using an electro-absorption modulator and 40-Gbit/s ETDM demultiplexer

A 10-GHz clock recovery from a 16×10-Gbit/s optical time-division-multiplexed (OTDM) data stream is experimentally demonstrated using an electro-absorption modulator and 40-Gbit/s electric time-division-multiplexed (ETDM) demultiplexer. The recovered clock signal exhibits excellent stability, with root square (RMS) jitter of 328 and 345 fs corresponding to back-to-back and transmission over 100 km, respectively.     

Efficient time gating in ultrafast optical TDM networks

Ultrafast optical communication is the backbone of high-speed global networking infrastructure. Optical time division multiplexing (OTDM) is a popular technique for embedding data from many simultaneous users on a single optical channel. This paper studies the optimal clock signal used in optical time gating to extract the data of the desired user in an OTDM network. We show that the pulse width of the clock signal can be optimized to achieve a minimum bit error rate (BER) in these networks. In this paper, we assume that the optical clock signal used for time gating has jitter, and there is therefore a delay variation between the clock and data signals. We model this delay as a zero mean Gaussian random variable. Using this model, an analytical BER expression is derived for systems with Gaussian pulses. In the numerical results, we find the optimal values of the clock pulse width by evaluating the BER versus the pulse width for different variances of the delay. Simulation results are also presented to evaluate the accuracy of the analytical expression.     

Optical time division multiplexing: systems and networks

The recent advances in optical time division multiplexed (OTDM) systems and components research show the technique to be highly suited to the generation and transmission of high capacity data on a single optical carrier. This approach uses a single wavelength to carry capacities of at least 40 Gb/s. Such systems are based on a clock frequency and tributary data rates which are easily accessible using electronic components. Short optical pulses are used in a return-to-zero data transmission format with temporal interleaving to map a number of optical data channels into a single electronic clock cycle. It is an approach that can be used to achieve extremely high data-rate bit interleaved systems. This article summarizes the developments in this field and outlines a possible methodology to evolve transport networks to encompass the potential that both WDM and OTDM have to offer     

高速OTDM系统的时钟恢复技术

介绍了高速光时分复用(OTDM)系统时钟恢复技术的三条实现思路，给出了具体的实验系统，指出了它们的适用场合。