光纤喇曼放大器的发展与应用

首先介绍了光纤喇曼放大器的发展情况和原理结构,与掺铒光纤放大器相比,指出光纤喇曼放大器的优点,然后在三种不同环境下,对混合FRA/EDFA放大与EDFA单独放大这前后两种放大技术的QoS性能进行了比较,最后介绍了FRA在SDH、CATV、WDM和企业存储网络中的应用.     

宽带混合光纤放大器研究

在讨论了宽带混合光纤放大器研究方法的基础上 ,设计了一个增益平坦带宽为 11.4THz的宽带混合光纤放大器 ,并对其增益和噪声特性进行了详细研究 ,最后将其应用于一个 2 0信道的WDM系统 ,实现了 6 4 0km无误码传输     

光纤放大器的研究动态

介绍了国内外光放大器的最新研究动态,主要包括掺铒光纤放大器、掺铥光纤放大器、光纤喇曼放大器及半导体光放大器,并指出相关放大器的发展趋势,最后对光纤放大器的特性进行了比较分析.     

前途光明的宽带混合光纤放大器

由掺铒光纤放大器（EDFA）和光纤嗽曼放大器（FRA）构成的宽带混合光纤放大器（Wideband Hybrid Fiber Amplidfier)具有高增益,宽带宽,低噪声,高输出功率等优点,是今后光纤放大器的发展方向,本文概括院落带混合光纤放大器的典型结构。综合报道了近年来的研究进展和最新发展动态,最后展望了这种混合放大器的应用前景。     

S-band光纤放大器的研究进展

主要介绍了几种S-band光纤放大器,包括光纤喇曼放大器(RFA)、增益位移掺铥光纤放大器(GS-TDFA)、掺铒光纤放大器(EDFA)和光学参量光纤放大器(OPA),综述了其原理、特点、研究现状及发展趋势。     

光放大器在现代光缆通信中的应用

光放大器是可将微弱光信号直接进行放大的器件。它的出现使光纤通信技术产生了质的飞跃:它使光波分复用技术、光弧子通信技术迅速成熟并得以商用,同时它为未来的全光通信网奠定了扎实的基础,成为现代和未来通信系统中必不可少的重要部件。     

光纤喇曼放大器原理的数值模拟分析

为分析光纤喇曼放大器的原理,基于已有的耦合微分方程,采用数值解法,对不同抽运光强下不同长度光纤所产生的受激喇曼散射现象进行数值模拟,并对模拟结果作了详尽分析。发现:发生受激喇曼散射现象时,抽运光强和光纤长度发生兑换;能量红移现象普遍存在,包括同阶Stokes光谱内部和不同阶的Stokes光谱之间。抽运光强越大,能量红移现象越明显。此结论比文献中的实验结果更全面,对相关实验有指导作用,为光纤喇曼放大器和光纤喇曼激光器等器件的原理理解和优化设计提供了有益的参考。     

光放大器现状及未来发展

综述光放大器的技术现状及未来发展 ,主要介绍掺铒光纤放大器 (EDFA)、掺铒波导放大器(EDWA)、半导体光放大器 (SOA)以及喇曼光纤放大器 (FRA)。最后比较了这几种放大器的发展趋势。     

S—波段光纤放大器及其研究进展

介绍了实现S-波段放大的3种光纤放大器；掺铥光纤放大器（TDFA）、增益位移TDFA（GSTD-FA）和光纤喇曼放大器，就其原理、结构、特点和发展现状进行了综述。     

Properties of fiber Raman amplifiers and their applicability todigital optical communication systems

Bit error rate performances of fiber Raman amplifiers both as booster amplifiers and as detection preamplifiers are studied in intensity modulation/direct detection optical communication systems. It is theoretically shown that, in the booster amplifier application, receiver sensitivity degradation due to amplification can be made less than 0.2 dB for signal-to-noise power ratio larger than 20 dB, and thus an allowable transmission line loss can be increased approximately by the value of Raman gain. For detection preamplifier use, receiver sensitivities in the Raman preamplifier system are numerically calculated in terms of minimum detectable signal power at 100-Mbit/s and 2-Gbit/s bit rates. In both bit rates, it is shown that, for a Raman gain greater than 20 dB, minimum detectable signal power can be improved by more than 15 dB over the conventional detection level without Raman amplification. Preliminary experiments are carried out using a 1.32-μm Nd:YAG laser and a 1.4-μm laser diode as pump and signal light sources, respectively. The experimental results are in good agreement with theoretical estimations     

Long-haul coherent optical fiber communication systems usingoptical amplifiers

Studies on long-haul coherent optical fiber communication systems with in-line optical amplifier repeaters are made theoretically and experimentally. By theoretical calculation it was found that coherent systems can achieve wider dynamic range for an amplifier input power as compared with the intensity-modulation direct-detection (IM-DD) systems. The feasibility of such systems using traveling-wave semiconductor laser amplifiers (TWSLAs) and erbium-doped fiber amplifiers (EDFAs) was investigated, and 546 km, 140 Mb/s CPFSK transmission using TWSLAs and 1028-km, 560-Mb/s CPFSK transmission using EDFAs were successfully demonstrated     

光纤光栅在高速光通信系统中的新应用

光纤光栅以其独特的优点，广泛应用于高速光通信系统中，为此介绍了光纡光栅作为EDFA增益均衡器、色散补偿器和偏振模色散补偿器等在高速光纤通信系统中的应用，分别研究了它们的原理，特点及发展状况。     

Optical fiber amplifiers for telecommunication systems

Optical amplification is of strategic importance for telecommunications. Optical amplifiers compensate for propagation losses in long distance links and branching losses in access networks, at the same time avoiding costly two-way conversions between optical and electrical signals. The devices available up to now are mainly represented by rare-earth-doped active fiber optical amplifiers. This article presents the state-of-the-art of optical amplifiers for telecommunications. However, erbium-doped fibre amplifiers are having a strong impact on the telecommunication market, thanks to the excellent performance of commercial devices. They are widely employed in long distance networks for the third transmission window, which is centered at λ=1550 nm, while in the second window, around λ=1310 nm, the role of semiconductor optical amplifiers is still competitive     

Weather-insensitive optical free-space communication using gain-saturated optical fiber amplifiers

This paper presents a weather-insensitive optical free-space communication (OFSC) method supporting optical packet channels. It operates optical fiber amplifiers (OFAs) used as boosters in gain-saturation regions. When the propagation loss gets too high, it decreases the average packet rate, or the average packet length, or both, to increase the optical power level launched into the free space. As a demonstration, 8 /spl times/ 10 Gigabit-Ethernet (GbE) channels were transmitted over a terrestrial distance of 2.4 km. One gain-saturated free-space optical repeater is used at the halfway.     

400Gbit/s高速大容量光通信系统单模光纤设计与制备

介绍了一种大有效面积单模光纤的数值设计分析与PCVD(等离子体化学气相沉积)制备工艺,该光纤的有效面积达到133μm2,同时在1 550nm处衰减系数优化到0.183dB/km,弯曲损耗优化至0.45dB/圈(弯曲半径7.5 mm)。在双偏振DFT-S CO-OFDM 4QAM/16QAM(4进制/16进制正交振幅调制的离散傅里叶变换扩展相干光正交频分复用)调制信号下,对该光纤在100Gbit/s和400Gbit/s系统的误码率和Q值等传输性能进行了验证。结果表明,该光纤能有效改善最佳入纤功率和非线性效应,可使传输距离提升30%,能有效优化400Gbit/s传输系统,并且在FTTx领域有着广泛的应用前景。     

高速光纤通信系统中一阶偏振模色散自动补偿技术的研究

偏振模色散(PMD)对10Gbit/s及更高速率的光纤通信系统的影响已不可忽略，因此PMD的补偿技术成为研究的热点问题。本文分析并通过实验验证了PMD引起的脉冲展宽对接收信号频谱的影响，在此基础上提出了一种PMD的补偿技术。在用保偏光纤模拟PMD效应的10Gbit/s的传输线路中实现了一阶PMD的自动补偿。     

水下无线光通信系统中可变增益放大器的实现

为了减小水下无线光通信系统中接收信号的动态范围,采用可变增益放大器,论述了基于数字模拟转换器和数字电位器实现可控增益的两种方法,并对基于数字电位器实现的方法进行了仿真实验.结果表明,该方法能有效压缩信号的动态范围,并使其趋于稳定.     

Cascaded optical communication systems with in-line semiconductoroptical amplifiers

The optimization of the performance of installed standard-monomode fibers based optical transmission systems with in-line semiconductor optical amplifiers (SOA's) is reported in this paper. Both solitons and nonreturn-to-zero (NRZ) signals are studied and their capacities are compared. This investigation is based on numerical simulations by solving the nonlinear Schrodinger equations with the split-step method while the SOA is simulated with two different models that we show to be in a good agreement, transmissions over distances of the order of several hundreds of kilometers are shown to be possible, and very long distances can be reached especially if in-line sliding filters are used     

高速光纤通信中的CRC-32算法的研究与实现

循环冗余校验CRC广泛用于各种数字通信中用以提高传输数据的可靠性,是通信领域最为常用的一种校验算法。针对高速的光纤通信,给出了一种参数模型可设置的32位CRC用于其数据校验,采用VHDL语言对算法完成建模与实现,并以ALTERA公司开发的EDA工具QuartusII9.1作为编译、仿真平台进行了仿真验证。电路的综合仿真结果表明,该设计完全满足高速,大容量的光纤通信数据校验要求。