FPGA在波分复用系统光监控信道中的应用

在波分复用系统中,光监控信道用来传送网管信息。介绍了一种WDM(波分复用)光监控信道的设计方法,使用Altera FPGA(现场可编程门阵列)完成光监控信道板的核心功能。发送部分主要由时钟模块、HDLC(高级数据链路控制)和E1时序产生及成帧模块、NRZ(不归零码)/CMI(传号反转码)、公务电话处理模块和单片机时序发生模块组成,接收部分包括时钟模块、E1帧同步检测与HDLC标志字检测处理模块、NRZ/CMI解码模块等。设计采用自顶向下的方法,各功能模块由VHDL语言设计完成。该设计已经成熟应用在实际的WDM系统中。     

基于FPGA的CDMA调制/解调技术的研究与实现

基于水声通信系统的需求,设计了基于FPGA的CDMA技术的调制/解调模块,选用m序列作扩频码,BPSK作为调制方式。该设计在EP3C10E144C8N芯片上,实现了各个功能模块,完成了CDMA调制/解调功能,仿真结果表明该设计功能正常并且工作稳定。CDMA调制/解调模块将应用于水声通信系统。     

10Gbit/s SFP+光收发模块

文章报道一种10 Gbit/s SFP+(加强型小型化可热插拔)光收发模块.该模块由TOSA(光发送子系统)、ROSA(光接收子系统)和控制电路组成,实现了SFP+的智能化控制和模块状态监测功能.依照SFF-8431(多源协议)对该模块进行了测试,结果表明,该模块满足10 Gbit/s以太网的应用要求,且最高可支持11.3 Gbit/s的速率.     

SDH中E3复用/解复用系统的FPGA实现

基于FPGA设计了SDH中E3信号复用/解复用系统,包括HDB3编/译码模块、码速调整模块、映射/解映射模块、定位/解定位模块和复用/解复用模块等。在QuartusⅡ9.0中进行了仿真、综合、布局布线和时序仿真,直至各部分功能分别实现,并在Altera公司的Cyclone第四代产品EP4CE115F29C7N上验证了其正确性。用SDH分析仪ANT-5对设计结果进行了一周的测试,误码为0,说明设计基本正确。     

10Gbit/s甚短距离并行光传输模块研究

本文讨论了符合OIF-VSR4-01.0规范的10Gbit/s 甚短距离(VSR)并行光传输模块实验系统、转换集成电路、12通道850nm垂直腔面发射激光器(VCSEL)并行光发射模块、12通道并行光接收模块中的12通道前端放大电路的实现,并给出了系统测试方案和测试结果。测试结果表明,转换集成电路数字逻辑部分的全部功能用FPGA实现,研制的12通道并行光发射模块传输带宽达12?.244Gbit/s。在点到点的传输测试中,采用12芯400MHz-km 62.5靘多模带状光纤时,传输距离达302米,系统误码率低于1?0-13,12通道前端放大电路单路工作速率达1.25Gbit/s。     

200 Gbit/s SR4光收发模块的研究与设计

针对互联网的高速发展,现代数据中心寻求一种高速率、高带宽的信息传输方式。光纤通信因其大容量以及低损耗的特点脱颖而出。光收发模块是光纤通信系统中完成光电信号转换的关键部件。该文重点分析了200 Gbit/s SR4光收发模块的基本原理,主要阐述了模块的发射单元、接收单元、管理单元及数字处理芯片4个部分。测试了200 Gbit/s SR4光收发模块的主要指标,测试结果表明,模块可以满足协议的各项要求。     

WG公司最新推出单机便携式2.5G SDH误码抖动测试仪

WG公司于1997年2月4日正式推出最新型的ANT-20E扩展型SDH测试仪。该仪表可在一台仪表中集PDH/SDH 2M—155M—622M及2.5G的全部误码及抖动测试功能。 最新可提供的硬件模块有: ·2.5G1310nm或1550nm的光/电口模块 ·2M—622M的抖动测试模块 ·2.5G的抖动测试模块ANT—20E接入自E1/2M到STM—16/2.5G     

爱立信推出10Gbit/s光接收器模块

爱立信微电子公司 (ＥｒｉｃｓｓｏｎＭｉｃｒｏｅｌｅｃｔｒｏｎｉｃｓ)现正研制一种新系列的 10Ｇｂ/ｓ光信号接收器模块 ,旨在用于都会和长距离网络中的ＤＷＤＭ及单信道应用。这个新系列的第一批产品是在ＰＩＮ光监测器基础上设计的产品 ,工作速度高达 10Ｇｂｉｔ/ｓ,波长在130 0至 160 0ｎｍ的范围。新型接收器模块中包含一只ＰＩＮ光监测器 ,一个低噪声的宽带互阻器 ,以一个体积很小的金属外壳封装 ,并有一条单模光纤引出线。新的光信号接收器模块的灵敏度的典型值为 -2 0ｄＢｍ ,带煤为 8ＧＨｚ ,针对 10Ｇｂｉｔ/ｓ的应用而进行了优…     

基于FPGA的高速数据采集控制模块设计

以Spartan-3E系列FPGA为核心控制模块,结合AD10242模数转换芯片和MXP-123MD-F光收发模块,实现了高速数据采集和光纤传输。其中FPGA用于实现数据控制、双口RAM和8B/10B编解码等功能。该数据采集控制模块具有性能可靠、实时性强、集成度高、扩展灵活等特点,并且通过试验验证了其功能的正确性。     

基于SFP光模块控制系统的设计和实现

设计、实现了一种完成光模块自适应功能的系统,且能够对SFP光模块一系列工作状态参数进行实时监测.此系统简化了对光模块的监控维护工作,并能简单快速地对光模块的内部存储单元进行读写,以满足其自适应功能的要求.     

WDM-PON中基于码型动态切换的组播实现方案

提出了一种利用码型动态切换的机制来实现波分复用无源光网络中组播业务的传输.组播业务采用DPSK调制格式,下行单播业务采用动态切换的Manchester/NRZ调制格式.其中Manchester调制格式是由下行单播数据和同频的时钟信号通过电逻辑异或门产生.实验验证了同时传输5Gb/s下行点对点信号和1.25Gb/s组播信号的WDM-PON组播传输方案的可行性.     

Photonics-based multi-band/multi-mode radar signal generation

Photonic Network Communications - Microwave/millimeter-wave photonics is playing a prominent role in overcoming the challenges of RF signal generation and processing. This evolving technology has...     

Multichannel transforms for signal/image processing

This paper presents a novel approach to the Fourier analysis of multichannel time series. Orthogonal matrix functions are introduced and are used in the definition of multichannel Fourier series of continuous-time periodic multichannel functions. Orthogonal transforms are proposed for discrete-time multichannel signals as well. It is proven that the orthogonal matrix functions are related to unitary transforms (e.g., discrete Hartley transform (DHT), Walsh-Hadamard transform), which are used for single-channel signal transformations. The discrete-time one-dimensional multichannel transforms proposed in this paper are related to two-dimensional single-channel transforms, notably to the discrete Fourier transform (DFT) and to the DHT. Therefore, fast algorithms for their computation can be easily constructed. Simulations on the use of discrete multichannel transforms on color image compression have also been performed.     

Modeling modulators for A/D signal conversion

The performance of an SDM is reported to decline by various factors produced during the design and fabrication process. Namely, the nonideal factors are: the limit of the operational amplifier (op-amp) output swing, the finite DC gain of the op-amp, op-amp slew rate, the integrator gain error by mismatching of the capacitor and nonideality of the internal multibit quantizer. In this article we report not only modeling results of the ideal second-order SDM with a multibit quantizer, but also evaluate its performance according to bit number and OSR. In addition, we determine the maximum error limit of the SDM after investigating the influence of the nonideal factors on the performance of the SDM     

一种基于Map/Reduce的并行化敌我识别信号关联方法

随着敌我识别侦察装备的广泛部署,其侦察数据呈现爆炸式增长,多源且复杂的海量信号侦察数据对后端数据分析提出了较高要求.针对传统敌我识别信号关联分析方法速度慢、效率低的问题,通过研究其关联流程的可拆分特性,提出了一种基于Map/Reduce的敌我识别信号聚类和关联分析方法,将传统敌我识别信号关联分析流程进行方位和时间拆解,在大数据平台上进行分布式并行计算,大幅提升了大数据量情况下的关联分析效率.实验结果表明,在数据量达到108条以上时,所提方法比传统方法计算效率高10倍以上.     

Board-level optical-to-electrical signal distribution at 10 gb/s

An opto/electrical prototype for on-board optical-to-electrical signal broadcasting operating at 10 Gb/s per channel over an interconnect distance of 10 cm is demonstrated. An improved 1/spl times/4 multimode interference (MMI) splitter at 1550 nm with linearly tapered output facet is heterogeneously integrated with four p-i-n photodetectors (PDs) on a silicon (Si) bench. The Si bench itself is hybrid integrated onto an FR-4 printed-circuit board with four receiver channels. A novel fabrication/integration approach demonstrates the simultaneous alignment between the four waveguides and the four PDs during the MMI fabrication process. The entire system is fully functional at 10 Gb/s.     

北斗/GPS信号转发器的分布参数设计

本文设计了一款可以兼容北斗、GPS的信号转发电路设计.该电路选用英飞凌公司的BFP740ESD芯片,通过ADS软件进行仿真、设计了一款分布参数匹配方式的两级放大电路,实现了在1.555GHz-1.58GHz的频带内,该信号转发器的噪声系数为0.82dB,增益为41.4dB,输入输出反射系数小于-13dB.     

A signal/noise analysis of quasi-static MR elastography

In quasi-static magnetic resonance elastography, strain images of a tissue or material undergoing deformation are produced. In this paper, the signal/noise (S/N) ratio [SNR] of elastographic strain images, as measured by a phase-contrast technique, is analyzed. Experiments are conducted to illustrate how diffusion-mediated signal attenuation limits maximum strain SNR in small displacement cases, while the imaging point-spread function limits large displacement cases. A simple theoretical treatment agrees well with experiments and shows how an optimal displacement encoding moment can be predicted for a given experimental set of parameters to achieve a maximum strain SNR. A further experiment demonstrates how the limitation on strain SNR posed by the imaging point-spread function may potentially be overcome.     

A 30-MHz mixed analog/digital signal processor

A multiplying encoder architecture that is implemented in the design of a mixed analog and digital signal processor is presented. The processor is suitable for performing both high-speed A/D conversion and digital filtering in a single chip. The device can resolve the input with 8 b at 30 Msample/s and perform 28 multiply and 28 add operations per sample under typical conditions. The processor is designed for a 28-tap programmable FIR (finite impulse response) filter with analog input signal which can be used for waveform shaping of the modem to obtain the desired transmission performance for business satellite communication and mobile communication. The chip is fabricated in a 1-μm double-polysilicon and double-metal CMOS technology. The chip size is 9.73×8.14 mm², and the chip operates with a single +5.0-V power supply. Typical power dissipation is 950 mW; 330 mW is dissipated in analog and 620 mW is in the digital block     

Measured signal/quantising-distortion ratio of high-information delta modulation

Measured signal/quantising-distortion ratio (s.q.d.r.) of a high-information delta-modulation codec, both as a function of input level and samplin frequency, is presented. The loss in s.q.d.r. compared with uniform delta modulation is discussed. Meeting requirements on s.q.d.r. is shown to be separable from fulfilling those on dynamic range.