色散平坦光纤中的高速率PM-16QAM信号传输研究

提出了一种高速率、偏振复用、正交幅度调制信号的色散平坦光纤传输系统,传输速率分别为160 Gbps和256 Gbps,调制格式为PM-16QAM。实验研究了色散平坦光纤链路系统的传输特性,并分别与非零色散位移光纤和标准单模光纤链路传输特性做了比较。实验结果表明,较低输入光功率情况下,PM-16QAM信号在160 Gbps传输50 km时,经色散平坦光纤传输后的误差矢量幅度EVM优于经非零色散位移光纤传输情况0.5%,比特误码率BER优于非零色散位移光纤传输情况两个数量级;色散平坦光纤链路能更好地衰减旁瓣噪声;256 Gbps传输50 km和75 km时,仅在色散平坦光纤链路传输后可以较好地解调出信号;传输距离越长,保持较好特性时输入光功率范围越小。对比160 Gbps和256 Gbps情况,高速率PM-16QAM信号在色散平坦光纤链路的传输特性优于非零色散位移光纤和标准单模光纤链路的传输特性,传输速率越高、传输距离越长效果越明显。     

安华高科技推出12通道并行光纤模块产品

Avago（安华高科技）宣布推出新一代并行光纤模块产品AFBR-776／786BxxZ,具有12通道,可提供每通道6．25 Gbps的传输能力,带来总计可达75 Gbps、距离可达100米的连线传输速率。12通道并行光纤产品将包含两线式串行接口监测能力,可以用来扩展每通道功能和可控能力。     

AFBR-776/786BxxZ：并行光纤模块

Avago推出新一代并行光纤模块产品,Avago的AFBR-776/786BxxZ 12通道并行光纤模块可以提供每通道6．25Gbps的传输能力,带来总合达到75Gbps,距离可达100米的连线传输速率。领先业内所推出的12通道并行光纤产品,将包含两线式串行接口监测能力,     

40Gbps×16DWDM传输系统的色散补偿仿真研究

本文提出了一种速率为40Gbps的16通道DWDM传输系统的色散补偿方案,通过数值仿真研究了系统中光纤的入纤功率、色散补偿因子、色散补偿系数以及脉冲占空比等参数对系统传输性能的影响,仿真结果对40Gbps DWDM系统设计具有参考价值。     

基于波分复用的红外图像光纤传输系统

针对目前红外搜索跟踪系统中,光纤千兆以太网带宽无法满足多传感器实时图像传输需求,设计了基于波分复用的红外图像光纤传输系统,此系统带宽达到4 Gbps,体积算法不变的情况下,可扩展到8 Gbps,满足红外搜索跟踪系统使用要求。     

MAX3798：VCSEL驱动器／限幅放大器

Maxim推出单芯片VCSEL驱动器和限幅放大器方案MAX3798,用于SFP＋光纤通道和以太网。该器件采用Maxim的MBIC3集成电路工艺制造,工作速率大于10Gbps、具有多种接收器和发送器可编程特性、且功耗仅为320mW。MAX3798集2种芯片的功能于一体,为光纤通道（1x／2x／4x／8x）和以太网10GBASE-SR传输系统提供低成本、低功耗方案,从而简化了模块制造商的收发器BOM。     

新12通道并行光纤模块产品

AFBR-776／786BxxZ12通道并行光纤模块可以提供每通道6．25Gbps传输能力,带来总合达到75Gbps,距离可达100m的连线传输速率。领先业内所推出的12通道并行光纤产品将包含两线式串行接口监测能力,可以用来扩展每通道功能和可控能力。     

E波段10Gbps级超宽带毫米波无线通信系统设计与验证

毫米波的自由空间损耗是限制其无线通信传输距离的瓶颈之一。为实现超宽带、高速率毫米波信号的远距离无线传输,研究真空放大模块在无线通信传输中的应用验证,文中通过研制基带信号发射/接收处理模块、毫米波上下变频模块、大功率行波管等,设计实现了基于真空放大模块的毫米波无线传输系统,其工作带宽不小于2 GHz,传输速率3.3 Gbps～10.1 Gbps可调。文中采用大功率耦合器和一对矩形喇叭天线对系统进行了空口传输测试,试验测得系统误码率为10^-5量级。根据链路余量折算,等同信噪比条件下,系统空口传输距离不小于10 km,实现了超宽带、大容量毫米波信号的高性能无线传输。     

基于DSP的光纤1553总线数据传输板卡设计

阐述一种符合FC-AE-1553光纤总线协议的设计，以DSP处理器作为主控的光纤1553数据传输板卡，它采用模块化设计原则，包括DSP系统、光纤传输系统、供电系统，同时对EMIF总线进行逻辑设计，光纤传输速率满足2.5Gbps。搭建测试平台，对板卡的稳定性及光纤数据传输的功能进行验证。     

基于GE交换的Gpbs无线传输平台ARQ算法的研究

基于千兆以太网（GE）交换的无线传输平台结构较之传统软件无线电平台具有强大的可编程能力和良好的可扩展性,配合多入多出-正交频分复用（MIMO-OFDM）技术,可实现达到1 Gb/s吞吐率（Gbps）的无线传输系统,针对Gbps高速无线传输的需求与平台特性,提出了一种自动重传请求（ARQ）机制,结合平台的结构特点,针对系统需求,在保证无线传输可靠性的前提下减小ARQ机制对传输吞吐率的开销,并可通过参数的优化适应于不同的应用场景。     

Mixed line rate virtual topology design considering nonlinear interferences between amplitude and phase modulated channels

In the last years, the migration from 10 to 40/100 Gbps networks has been proposed as a solution to increase the capacity of transparent optical networks. Initially, the replacement of 10 Gbps legacy equipment was considered. Nowadays, some works point out that the deployment of mixed line rate (MLR) networks, where 10 Gbps and higher bit rate Gbps channels share the same fiber, could be more cost effective than the total replacement of 10 Gbps systems. In this paper, we investigate the planning of 10/40 Gbps MLR networks using the ITU 50 GHz grid, considering nonlinear interferences between 10 and 40 Gbps channels, which degrade the quality of transmission. This approach is novel in the literature. In addition, we conduct a set of tests normalizing the length of fiber links, to observe the trends in MLR planning for different network sizes.     

Bidirectional hybrid OFDM based Wireless-over-fiber transport system using reflective semiconductor amplifier and polarization multiplexing technique

In this paper, a bidirectional hybrid OFDM based Wireless-over-fiber architecture has been investigated and demonstrated to transmit 10 Gbps as well as 6.25 Gbps OFDM data for downlink transmission and 5 Gbps as well as 2.5 Gbps OFDM data for uplink transmission over 50-km single mode fiber (SMF) employing polarization multiplexing technique (POLMUX) at optical line terminal (OLT) and optical network unit (ONU). The POLMUX technique is exercised by polarization beam splitters and polarization beam combiners. Mach-Zehnder modulator and RSOA have been used for modulation at OLT and ONU respectively. Transmission performances are observed by constellation diagrams, EVM and BER values. For 10 Gbps, 6.25 Gbps down-link signal and 5 Gbps, 2.5 Gbps up-link signal the power penalty of 3 dBm, 2.3 dBm and 4 dBm, 3.2 dBm at a BER of 10⁻⁹ between back-to-back and over 50-km SMF plus 10-m and 5-m wireless link, are observed respectively. For 32-QAM < 10.5% EVM and for 16-QAM < 13% EVM are recorded. Our architecture is a prominent alternative, not only due to its have potential of both optical and wireless technology but also it is offers a powerful platform to communicate high data rates and support various type of future unforeseen applications and services.     

Bidirectional and simultaneous transmission of baseband and wireless signals over RSOA based WDM radio-over-fiber passive optical network using incoherent light injection technique

Reflective semiconductor optical amplifier (RSOA) based wavelength division multiplexed radio-over-fiber passive optical network (WDM−RoF−PON) has been proposed and demonstrated, to transmit 2.5 Gbps baseband (BB) and 1.25 Gbps wireless data in downstream and 1 Gbps BB data signal in upstream over 25-km single-mode fiber (SMF), and wireless downstream signal over 25-km SMF as well as 5.2 m free space in air. In the downstream, 2.5 Gbps BB data and 1.25 Gbps wireless data are modulated using single-electrode Mach–Zehnder modulator (SD-MZM) based on double-sideband with optical carrier suppression (DSBCS) scheme and simultaneously transmitted by incoherent light injection technique and employing fiber Bragg grating (FBG) at the base station. RSOA is utilized at the user end to reuse the carrier for uplink transmission. High receiver sensitivity, low bit-error-rate (BER) and excellent eye-diagram, eye height are achieved in our proposed network system and the results affirm the acceptability of proposed RSOA based WDM−RoF−PON.     

用MEMS光开关实现高性能光互连网络

建立了1Gbps传输结构的高性能光互连网络，来提高计算机群系统的网络性能。它利用微机电系统(MEMS)光开关和PCI总线全带宽网络接口卡构成光互连链路。全带宽PCI接口卡总线峰值传输速率为132Mbytes／s，光信号传输速率可达1Gbps以上。用MEMS制做的全光开关减少了光—电之间的转换，提供的开关方式与数据的波长、速率和信号格式无关。因而，利用这种网络结构，可以最大限度地减少网络延迟和网络通信开销，极大地提升了机群系统的总体性能。     

展望L波段光纤放大器的应用

目前一些长距离光纤干线承载信号速率达50-100Gbit/s,许多网络每年的通信量增长达30%-150%,虽然EDFA和DWDM技术能够满足现行网络的设计要求,但为获得更宽的波带或特别需求的不同波带,系统运营商正逐步趋向于L波段窗口传输的光学器件,L波段EDFA这种新一代的掺铒光纤放大器有助于开发利用已铺设光纤,降低光线性失真及系统成本。     

Demonstration of CSRZ Signal Generator Using Single‐Stage Mach‐Zehnder Modulator and Wideband CMOS Signal Mixer

In this paper, we demonstrate an electrically band‐limited carrier‐suppressed return‐to‐zero (EB‐CSRZ) signal generator operating up to a 10 Gbps data rate comprising a single‐stage Mach‐Zehnder modulator and a wideband signal mixer. The wideband signal mixer comprises inverter stages, a mixing stage, and a gain amplifier. It is implemented by using a 0.13 μm CMOS technology. Its transmission response shows a frequency range from DC to 6.4 GHz, and the isolation response between data and clock signals is about 21 dB at 6.4 GHz. Experimental results show optical spectral narrowing due to incorporating an electrical band‐limiting filter and some waveform distortion due to bandwidth limitation by the filter. At 10 Gbps transmission, the chromatic dispersion tolerance of the EB‐CSRZ signal is better than that of NRZ‐modulated signal in single‐mode fiber.     

Influence of nonlinear effects on 6.4 Tb/s dual polarization quadrature phase shift keying modulated dense wavelength division multiplexed system

In this paper, we have proposed a high‐performance transmission system of 32 channels based on dense wavelength division multiplexing (DWDM) through an optical fiber link consisting of 110 km per span. To check the influence of nonlinear effects, we have considered phase modulation (SPM), cross‐phase modulation (XPM), four‐wave mixing (FWM), stimulated Raman scattering (SRS), and self‐steepening (SS) which limits the performance of optical communication systems. In the proposed system, each channel is modulated at 200 Gbps of dual‐polarization quadrature phase shift keying (DP‐QPSK) format, with a 50‐GHz grid yield whole data rate of 6.4 Tbps. The results have proved that the nonlinear phenomena degrade the performance of proposed optical fiber communication systems, and XPM has the most dominant effect, followed by SS, SRS, and SPM. The simulation was carried out with Optisystem 14 which is powerful software for modeling and simulation of optical fiber transmission.     

基于IQ/CD的单光子载波矢量信号传输系统设计

提出并验证了一种使用单光子载波、基于 IQ 调制和相干检测的新方法来传输两个矢量信号,单光子载波上的同一个偏振态光携带 IQ 调制信号,具有正交偏振状态的光载波直接通过光波调制光波传输,两个正交极化波的光发送到相干检测器中解调。仿真实验了在25 km 单模光纤两个 QPSK 信号以数据率为1 Gbps 传输时的传输性能。