共查询到20条相似文献,搜索用时 15 毫秒
1.
WDM+EDFA+DCF光纤传输系统中色散补偿方案的分析 总被引:4,自引:0,他引:4
由于在WDM+EDFA光纤传输系统中使用常规单模光纤(SMF)在1550nm窗口的大色散限制了传输距离,采用色散补偿光纤(DCF)进行色散补偿是上前一种较为理想的方法。本文基于光纤WDM+EDFA+DCF的长距离传输系统,讨论了DCF色散补偿对光纤非线性效应交叉相位调制和四波混频(FWM)的影响,提出了采用DCF集总、后置、非完全补偿的色散补偿方案,这种方案可合系统具有更佳的传输性能。 相似文献
2.
3.
介绍光纤的色散特性,色散对有线电视光纤传输的影响,长距离1 550 nm模拟光传输系统的设计要求,以及现有的色散补偿技术。 相似文献
4.
介绍光纤的色散特性,色散对有线电视光纤传输的影响,长距离1550nm模拟光传输系统的设计要求,以及现有的色散补偿技术。 相似文献
5.
J.A.R. Williams L.A. Everall I. Bennion N.J. Doran 《Photonics Technology Letters, IEEE》1996,8(9):1187-1189
Group-delay dispersion slope causes signal deterioration in long-distance high-data-rate communication systems. We report the fabrication of high-quality apodized and chirped fiber gratings with dispersion slopes as high as -1800 ps/nm/sup -2/ over a 0.7-mn bandwidth-sufficient to compensate for the dispersion slope of >25000-km length of standard fiber at a wavelength of 1550 nm. We believe this is the first time that fiber Bragg gratings have been specifically designed and fabricated for dispersion slope compensation. The fabrication technique uses a standard unchirped phase mask and two scans of the inscribing UV beam. 相似文献
6.
A successful repeaterless 10 Gb/s bidirectional transmission experiment is demonstrated at the 1550 nm wavelength through 120 km of single-mode fiber. Fiber chromatic dispersion compensation in both transmission directions is realized by insertion of the same dispersion compensating fiber in the transmission fiber span. Excellent long-term error rate performance (BER < 10-14) is achieved by suppression of the Rayleigh backscattered signal power with low loss narrow-band fiber grating reflection filters. 相似文献
7.
采用矢量光束传输法(VBPM)对小纤芯光子晶体光纤(PCF)的色散特性进行了数值分析,研究发现通过调节光子晶体光纤的结构参数可以灵活的对其色散补偿值进行调整,能够实现C L波段(1 530~1 565 nm)的宽带色散补偿功能,并且对标准单模光纤的色散斜率有很好的补偿.在∧=1.0μm,d/∧=0.7时,1 550 nm处的色散值可以达到-339.1 ps/(km×nm),相关色散斜率(RDS)可以达到0.003 2 nm-1,能够有效的对标准单模光纤进行色散斜率补偿. 相似文献
8.
啁啾光脉冲在高阶色散控制光纤链中的稳定传输 总被引:6,自引:2,他引:4
基于一种二阶和三阶色散补偿的光纤级联系统模型 ,用数值法对啁啾皮秒光脉冲作了传输模拟。结果表明 ,完全补偿的高阶色散控制系统消除了三阶色散所引起的脉冲边沿部的振荡 ,减弱了脉冲峰的时间移动 ;另外 ,在确定的配置下 ,给输入脉冲附加一最佳的频率啁啾 ,可使得色散控制孤子稳定传输。脉冲宽度和啁啾以及光强度都围绕在初始值附近波动 ,在每个补偿周期末端 ,基本恢复到初始值 ;最佳啁啾的选取与二阶色散的配置有关 ,与三阶色散的配置无关 ;文中画出了 10 0Gbit/s码率的 64位随机高斯光脉冲序列在完全补偿系统中传输 10 0 0 0km后的眼图。由清晰的眼图可知 ,这种完全补偿系统减弱了脉冲之间的相互作用 相似文献
9.
为确保广播电视信号不间断传输,增强对突发事件的应急响应能力,杭州利用1 550 nm传输技术结合色散补偿技术,建设了区县数字电视灾备信号模数混合传输网。介绍杭州区县1 550 nm灾备传输网设计方案和系统指标测试,证实1 550 nm经过300多km传输后仍然具有优良的播出质量,满足国家广电总局新颁布的《广播电视安全播出管理规定》的要求,1 550 nm光纤传输技术在数字电视区县联网中具有广阔的应用前景。 相似文献
10.
1310nm和1550nm波长的光纤弯曲损耗及对光缆线路测试的探讨 总被引:4,自引:0,他引:4
刘世春 《光纤与电缆及其应用技术》2001,(1):39-43
单模通信光纤在1550nm波长的损耗小于在1310nm波长的损耗,而在1550nm波长光纤的弯曲损耗大于在1310nm波长光纤的弯曲损耗。基于这种事实,文章对光缆线路工程中简化光纤测试工作的方法和意义以及有关弯曲损耗的一些值得注意的实际问题进行了详细的讨论。 相似文献
11.
12.
Okuno T. Hatayama H. Soma K. Sasaki T. Onishi M. Shigematsu M. 《Electronics letters》2004,40(12):723-724
New dispersion-flattened fibres having negative dispersion of about -8 ps/nm/km over the whole telecommunication band are developed. Transmissions with 10 Gbit/s directly modulated LDs over 51 km at 1275 nm and over 80 km at 1550 nm are realised without dispersion compensation. 相似文献
13.
14.
《Optical Fiber Technology》2014,20(5):461-466
We present a method for transmitting 25-Gb/s optical nonreturn-to-zero signals at a wavelength of 1550 nm over a 40-km single-mode fiber without any dispersion compensation methods. We propose optimized self-phase modulation by varying parameters of the fiber launching power and the extinction ratio of optical non-return to zero signals to overcome severe signal distortions by the chromatic dispersion effect. Using the optimization of the self-phase modulation effect, we were able to transmit 25-Gb/s optical nonreturn-to-zero signals over a 40-km single-mode fiber, which can be applicable to passive optical networks with a single wavelength channel and a high split ratio. We demonstrated that the self-phase modulation effect can be controlled by the extinction ratio and the fiber launching power. 相似文献
15.
16.
Broadband dispersion compensation is demonstrated at 2.5 and 10 Gbit/s using an optical-fibre equaliser in combination with pulse compression. At 2.5 Gbit/s, simultaneous penalty-free dispersion compensation is achieved in a four-wavelength system operating at 1550 nm through 67 km of 1310 nm-optimised singlemode fibre. Low penalties are obtained over the full 20 nm gain bandwidth of the erbium-doped fibre amplifier, with the receiver sensitivity slightly enhanced at the short-wavelength end.<> 相似文献
17.
Compensation for composite second-order (CSO) distortion due to the interplay of fiber chromatic dispersion and self-phase modulation in externally modulated amplitude modulated subcarrier multiplexing (AM-SCM) systems employing optical-phase conjugation (OPC) is investigated. The simulation results show that significant reductions (>20 dB) of fiber-induced CSO may be achieved using OPC, which results in an increase of the transmission distance in AM-SCM video distribution systems operating near 1550 nm. In addition, a comparison with another compensation technique, the phase modulation technique, is established, showing that OPC is much less sensitive to variations in the fiber length. However it is also calculated that for practical implementation of the OPC-based compensation technique, 25 to 30 dB reduction in the amplified spontaneous emission (ASE) associated with the OPC will be required 相似文献
18.
设计了一种新型结构的光子晶体光纤,建立了对应的数学模型并采用全矢量有限元法对该结构的模场强度、有效折射率、双折射、色散特性和限制损耗进行了分析。研究表明,该光纤在1 550nm处可以获得高达7.66×10-3的双折射和低至12ps/(nm·km)的色散值,同时在800~1 600nm波长范围内,始终保持1.498×10-6 dB/m以下的极低限制损耗,可用于制造极低色散值的保偏光纤。 相似文献
19.
Receiver sensitivity degradations due to fiber chromatic dispersion without chromatic dispersion compensation in multigigabit optical continuous-phase frequency-shift-keying (CPFSK) transmission systems are evaluated experimentally and theoretically. Transmission distance limited by the chromatic dispersion of 15 ps/nm/km is estimated to be 130 km at 5 Gb/s and 33 km at 10 Gb/s 相似文献
20.
为了适应高速率大色散光纤信道对链路色散的精确补偿要求,研究并提出了一种基于射频信号2阶零功率点的信道色散测量方案。采用信号两边带的位相差来测量光纤链路中的色散值,通过在发射端加载射频信号,可以得到接收端射频信号功率大小随链路色散值的周期性变化关系,从仿真光纤链路色散随射频信号频率的变化曲线获得接收端射频信号2阶零功率点位置。结果表明,基于射频信号2阶零功率的信号测量方案色散测量误差可控制在±10ps/nm范围内。相较于1阶零功率点,基于射频信号2阶零功率点信道色散测量方案可满足高速率、长距离大色散光纤信道对色散值的精确测量需求。 相似文献