一种基于D8PSK／ASK正交调制的新型光标记方案研究

深入研究了差分八相移键控（I）8PSK）j幅移键控（AsK）正交调制格式的机理,提出了一种基于D8PsKjASK正交调制的新型光标记方案,利用D8PSK作为载荷的调制方式,ASK作为标记的调制方式,仿真实现了载荷120Gb／s、标记10Gb／s的传输速率。分析了信号的消光比（ER）对误码率（BER）的影响,仿真结果表明...     

基于正交调制FSK/ASK光标记交换技术

光标记交换技术是近几年国外光交换技术研究的热点，光标记交换的关键技术主要集中在光标记的产生、提取和识别等方面。着眼于以广义多标记交换（GMPLS）为基础的光标记交换，对一种新的基于正交调制FSK／ASK光标记交换技术进行了研究，分析了基本原理并在此基础上建立了一套系统理论模型，最后对系统模型进行了仿真。     

基于调频调幅方式的光标记网络的传输性能

数值模拟了IP-over-WDM光网络中基于频移键控/幅移键控(FSK/ASK)正交调制的光标记信号/净荷的传输性能.结果表明,ASK净荷的传输同时受到调制器消光比、接收光功率及光纤色散的影响;FSK光标记信号则主要受到调制器消光比和接收光功率的影响,几乎不受光纤色散因素的影响.     

一种2FSK信号参数估计的方法

文中在研究信号循环平稳特性的基础上给出了一种2FSK信号参数估计方法。基于2FSK信号频域上的单个谱峰与2ASK信号谱的相似性,首先在频谱上将2FSK信号的两个谱峰分离,然后根据2ASK信号的循环谱特征对单个谱峰做参数估计,最后将上述估计值做加权平均得到原2FSK信号的参数估计值。仿真结果表明该算法在信噪比（SNR）高于0dB时,信号参数估计MSE低于10^-4。     

基于正交FSK/ASK再调制的新型WDM-PON结构

文章提出了一种新型的基于正交频移键控(FSK)/幅移键控(ASK)再调制的波分复用-无源光网络(WDM-PON)结构,在下行方向,采用一种新型的基于相位-强度调制转换的FSK调制技术,实现了40 GHz的高速FSK信号;在上行方向,直接将10 GHz的ASK信号调制到FSK信号上,实现正交调制.文章研究了整个系统的性能,仿真结果显示,这种WDM-PON结构能满足接入网的传输要求,为未来的高速接入网提供了一种选择.     

一种基于SOA的XGM效应构成的XOR光逻辑门实现光标记交换的方法

提出了一种基于半导体光放大器(SOA)的交叉增益调制(XGM)效应构成异或(XOR)光逻辑门实现光标记交换的方法,并将该方法应用于载荷采用DPSK调制/光标记采用ASK调制的正交调制光标记交换系统中,以此来验证其可行性。通过仿真,在载荷信息速率为10Gbit/s,标记信息速率为2.5Gbit/s的非归零码DPSK/ASK正交调制光标记交换系统中实现了标记交换。     

基于循环谱和高阶累积量的联合模式识别方法

为完全识别当前卫星通信采用的主要调制方式,结合循环谱和高阶累积量两种信号调制识别方法的特点,提出了一种联合识别算法。该算法将循环谱特征加入到高阶累积量识别法中,联合多种特征参数判决构建识别器,首先利用循环谱完成ASK、FSK、PSK信号的类间识别以及FSK信号的类内识别,在此基础上利用高阶累积量方法完成FSK、PSK信号的类内识别。仿真结果表明,该算法能够完全区分卫星通信中主要的调制模式{ASK、2ASK、2FSK、4FSK、BPSK、QPSK},在信噪比高于5 d B时识别率达88%以上。     

利用幅度特性对数字信号调制方式进行识别

数字调制方式的识别对于通信信号分析有着重要的作用。针对数字信号（2ASK,4ASK,2PSK,4PSK,2FSK和4FSK）的调制方式,本文提出了一种只利用调制信号瞬时幅度特性便可以对调制信号进行识别的新算法,利用特征参数提取与决策树分类器结合对以上6种数字信号进行调制识别。首先提出了使用希尔伯特变换和解析函数对数字信...     

Tb/s单信道正交ASK/DQPSK光标记交换系统设计

随着光信道传输速率要求的不断增长,光标记交换(OLS)技术已成为目前光传输网中最具研究潜力的光交换技术,现阶段光标记交换系统中的单信道传输速率都在Gb/s量级上.为此,提出将正交调制光标记交换系统与光时分复用(OTDM)系统相结合,实现了一种Tb/s单信道的正交ASK/DQPSK光标记交换系统,并对系统进行了仿真实验,...     

微控制器集成射频功能和多种接口

英飞凌科技推出的PMA7105集成了8位8051微控制器、6kB闪存、基于PLL的发射器和晶振,可用于不同的工业、科学和医疗频段,包括315MHz、434MHz、868MHz和915MHz,不仅可提供更大的通信范围,而且可以方便地控制消费产品。PMA7105具有125kHz的ASK接收器,以及FSK／ASK 315MHz、434MHz、868MHz和915MHz的收发器。FSK／ASK收发器包括全集成的VCO、PLL合成器、ASK／FSK调制器和高效率的功率放大器,片上的电容器组可以准确地调谐中心频率。     

Investigation on the combined orthogonal FSK/ASK labeled signal based on cross gain modulation in a SOA

An optical frequency shift keying(FSK) transmitter performed by the cross gain modulation(XGM) in a semiconductor optical amplifier(SOA) is used in an optical label switching(OLS) system with 622 Mbit/s FSK label and 10 Gbit/s amplitude shift keying(ASK) payload.The key parameters in this system are optimized to achieve the best performance of FSK/ASK signal,including the input power of LD,the extinction ratio(ER) of the control light and that of the ASK payload.Besides,the transmission performance of ASK p...     

Improved optical coding method for orthogonal ASK/DPSK modulation format

Orthogonal ASK/DPSK labeling, which encodes label information on optical carriers in a modulation format, is regarded as a competing scheme to subcarrier multiplexed optical labeling. However, the inherent cross-talk limits the extinction ratio (ER) of the payload and label sensitivity. In this paper, two optical coding methods-Manchester coding and 8B10B coding-which can remarkably improve the system quality to obtain acceptable ER are discussed. A novel optical packet encoding methodmark-insertion coding-is demonstrated to significantly reduce cross-talk between the amplitude shift keying ASK) payload and the differential phase shift keying (DPSK) label through spectrum shaping. The performance of mark-insertion coding depends on the number of inserted 'marks'. Finally, the transmission over a 40 km single mode fiber (SMF) is compared with optical label swapping for a. 40 Gbit/s ASK payload and 2.5 Gbit/s DPSK label under these coding schemes. The experimental result is consistent with the theoretical analysis.     

Study of Optical Transmission Performance in IP‐over‐WDM Networks Based on FSK/ASK Combined Modulation Format

The transmission performance of optical labeling based on a combined frequency shift keying/amplitude shift keying (FSK/ASK) format is studied by numerical simulation. The simulation demonstrates that the bit‐error ratio (BER) characteristic of an ASK signal is limited by the extinction ratio, received optical power, and dispersion, simultaneously. However, an FSK signal is mainly limited by the extinction ratio (ER) and received optical power when the peak spectrum, which is used to detect the FSK signal, is relatively narrow.     

fso中一种光载波外差dpsk系统的设计

介绍了自由空间光通信中的相干通信系统,通过对相干光通信中振幅键控(ASK),频移键控(FSK),相移键控(PSK),差分相移键控(DPSK)四种光载波相干调制方式性能的分析和比较,仿真结果得出PSK调制误码性能更好,提出了一种光载波外差差分相移键控(DPSK)系统.     

Optimization of Key Parameters in 622-Mb/s Amplitude Shift Keying Labeled 40-Gb/s Return to Zero Differential Phase Shift Keying Optical Switching Network

Optimized are the label extinction ratio and dispersion compensation of an optical label switching transmission system, which employs 40-Gb/s return to zero differential phase shift keying（RZ-DPSK） payload labeled with 622-Mb/s amplitude shift keying（ASK） control data. In our scheme, the receiver sensitivities of payload and label achieves -27.8 dBm and -33.5 dBm, respectively. After transmitted over 40 km, 60 km and 80 km single mode fiber（SMF）（with dispersion compensation） respectively, the payload can be recovered with no power penalty, while the label can be recovered with less than 2 dB penalty.     

FSK Modulation Scheme for High-Speed Optical Transmission

In this paper,we describe the generation,detection,and performance of frequency-shift keying (FSK) for high-speed optical transmission and label switching.A non-return-to-zero (NRZ) FSK signal is generated by using two continuous-wave (CW) lasers,one Mach-Zehnder modulator (MZM),and one Mach-Zehnder delay interferometer (MZDI).An RZ-FSK signal is generated by cascading a dual-arm MZM,which is driven by a sinusoidal voltage at half the bit rate.Demodulation can be achieved on 1 bit rate through one MZDI or an array waveguide grating (AWG) demultiplexer with balanced detection.We perform numerical simulation on two types of frequency modulation schemes using MZM or PM,and we determine the effect of frequency tone spacing (FTS) on the generated FSK signal.In the proposed scheme,a novel frequency modulation format has transmission advantages compared with traditional modulation formats such as RZ and differential phase-shift keying (DPSK),under varying dispersion management.The performance of an RZ-FSK signal in a 4 × 40 Gb/s WDM transmission system is discussed.We experiment on transparent wavelength conversion based on four-wave mixing (FWM) in a semiconductor optical amplifier (SOA) and in a highly nonlinear dispersion shifted fiber (HNDSF) for a 40 Gb/s RZ-FSK signal.The feasibility of all-optical signal processing of a high-speed RZ-FSK signal is confirmed.We also determine the receiver power penalty for the RZ-FSK signal after a 100 km standard single-mode fiber (SMF) transmission link with matching dispersion compensating fiber (DCF),under the post-compensation management scheme.Because the frequency modulation format is orthogonal to intensity modulation and vector modulation (polarization shift keying),it can be used in the context of the combined modulation format to decrease the data rate or enhance the symbol rate.It can also be used in orthogonal label-switching as the modulation format for the payload or the label.As an example,we propose a simple orthogonal optical label switching technique based on 40 Gb/s FSK payload and 2.5 Gb/s intensity modulated (IM) label.     

Link-16信号MSK调制模式识别方法

针对Link-16信号采用的最小频移键控(MSK)调制模式,提出了一种基于瞬时特征参量与频谱特征的识别方法。该方法分2个层次进行调制识别,首先利用瞬时特征参量对幅移键控(ASK)、频移键控(FSK)和相移键控(PSK)、MSK信号进行识别,然后再利用频谱特征对MSK、PSK信号进行识别。最后,在特定的数据长度、信号幅度和信噪比的条件下,理论分析与仿真验证该算法易于实现、识别性能较好(90%)。     

多跳相干探测光谱幅度码标记交换系统传输特性分析

提出了一种基于标记栈技术的两跳相干探测光谱幅度码(SAC)标记交换系统.利用仿真软件,搭建了包含两个转发节点、两个156 Mb/s光谱幅度码标记、与40 Gb/s差分正交相移键控(DQPSK)净荷的光标记交换系统.利用接收光功率与光信噪比(OSNR)分析系统传输性能,并得到结论:经两个节点传输后,标记与净荷产生的功率代价与OSNR代价均未超过3 dB.     

On the bit error rate of lightwave systems with optical amplifiers

The problem of evaluating the performances of communication systems with optical amplifiers and a wideband optical filter is addressed. Exact probability of error expressions for optical signals in presence of amplifier spontaneous noise and photodetector shot noise are given and compared with those predicted by Gaussian approximations for amplitude shift keying (ASK), frequency shift keying (FSK), or differential phase shift keying (DPSK) modulations, both for ideal photodetectors and for the case where shot noise is significant