共查询到20条相似文献,搜索用时 421 毫秒
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Q8384是为评估DWDM性能而开发的一种光谱分析仪。它采用新型的单色仪表,用分散分光方式初次实现了10pm(0.01nm)波长分辨率的光频谱分析。由于其波长精度高、动态范围宽,可以用来测量光传送系统的光信号噪声系数(OSNR)、光纤放大器的NF以及DWDM滤光器的波长损耗等特性。WDM的评估WDM通信系统的基本框图如图1所示。发送方把n个不同的光信号波长λ1~λn复用到一根光纤上。途中的传送损耗通过EDFA光信号放大器加以补偿。收信方将收到的信号按波长进行分解恢复原状,为了进一步提高光信号的传送效率,频道间的波长间隔逐渐变窄,… 相似文献
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基于半导体光放大器中交叉偏振调制效应的波长转换器 总被引:6,自引:2,他引:4
了改善基于半导体光放大器(SOA)中交叉偏振调制效应(CPM)的波长转换器的转换信号码型效应,对交叉偏振调制一半导体光放大器波长转换器的工作原理进行了分析;通过讨论交叉偏振调制一半导体光放大器波长转换脉冲的上升沿和下降沿的频率啁啾,结合滤波器的透过谱特性,提出了一种利用滤波器的波长正斜率边和波长负斜率边分别对正相转换信号和反相转换信号进行码型优化的方案,并进行了实验验证。在信号码率为10Gb/s的交叉偏振调制一半导体光放大器波长转换实验中,采用光带宽为0.3nm的JDS滤波器优化转换信号的波形,基本消除了转换信号中长“1”码和长“0”码的码型效应,并将正相转换信号和反相转换信号的功率代价分别改善了3dB以上。 相似文献
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掺钕光纤放大器非线性折射率的分析 总被引:1,自引:0,他引:1
利用描述光纤放大器非线性折射率的公式.通过数值模拟的方法模拟了输入信号功率、抽运功率、信号波长以及增益效应和克尔效应等变量对掺钕光纤放大器非线性折射率的影响,结果表明无论是增加抽运光功率或信号光功率,当信号光的波长小于1064nm时.掺钕光纤放大器的非线性折射率的数值在此波段附近所对应的值为正值,大于此值所对应的值为负值;抽运功率较小时增益效应对非线性折射率的影响较大,而抽运功率较大时克尔效应对非线性折射率的影响较大,这主要是增益饱和所导致的结果;当信号光频率一定时,随抽运功率的增加非线性折射率逐渐增加并达到饱和。 相似文献
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实验研究了基于半导体光放大器(SOA)的四波混频(FWM)效应的单抽运光正交频分复用(OFDM)信号的波长变换系统.信号光源和抽运光源分别由两个不同输出波长的可调分布反馈式激光器(DFB-LD)产生.信号光源经2.5 Gb/s OFDM的电信号直接调制后再和抽运光源耦合,经光放大器后在SOA实现波长变换.实验结果显示,耦合信号经SOA四波混频效应后,产生新波长的信号光将携带OFDM信号,且转换效率与信号光和抽运光的功率、波长以及两者的偏振夹角有关.同时也测量了转换的OFDM信号的功率-误码曲线和接收星座图. 相似文献
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增益调制型波长转换中信号光波长的选择 总被引:2,自引:2,他引:0
增益调制型波长转换中 ,为得到转换后信号最大的消光比 (ER) ,信号光波长应该比半导体光放大器 (SOA)的小信号增益峰值波长长。采用分段模型 ,考虑了SOA中增益谱的不对称性以及增益峰值波长随载流子密度的漂移 ,深入研究了信号光功率 ,ER ,参考光功率 ,波长以及SOA注入电流对选择信号光波长λpk ,s 以及消光比改善量的影响。模拟计算表明 ,信号光功率每增加 3dB ,λpk ,s 就需向长波长移动约 7nm。信号光ER增加、参考光功率增加以及SOA注入电流的增加 ,λpk ,s 需向短波长移动。消光比改善量随信号光功率和电流的增加而显著增加 ,随信号ER的增加而降低 ,但是参考光功率和波长变化时影响不大 相似文献
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对基于半导体光放大器(SOA)交叉增益调制(XGM)效应的全光波分复用一光时分复用(WDM—OTDM)转换后的两路时分复用输出信号的消光比(ER)特性进行了分析。研究了两路波分复用的输入抽运光和探测光的功率、波长、抽运光的消光比、数据速率以及半导体光放大器的偏置电流、腔长和模场限制因子对转换信号消光比的影响。模拟结果表明,增大抽运光输入功率,选择长波长抽运光,可以增加转换光相应信道消光比,但减小了相邻信道的输出消光比;增加抽运光消光比,可以提高转换光消光比,但各个信道增长幅度不同;减小探测光输入功率,选取短波长探测光波长,增加半导体光放大器的腔长和模场限制因子以及大的偏置电流可提高转换光消光比;对于两路或多路波分复用信号转换时分复用信号的过程中,一定要考虑转换光每个信道消光比的均衡。 相似文献
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基于半导体光放大器的四波混频型全光波长转换器 总被引:4,自引:1,他引:3
本文报道了基于自行研制的半导体光放大器(SOA)的四波混频(FWM)型全光波长转换,采用环型腔掺铒光纤激光器(EDFL)作为泵浦源,实现了转换波长的连续可调。并就波长转换间距、光放大器的小信号增益和输入泵浦光功率对转换效率的影响进行了理论与实验分析,结果表明高的SOA增益和较大的输入泵浦光功率须利于转换效率的提高。 相似文献
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A novel scheme of wavelength conversion based on single semiconductor optical amplifier (SOA) inserted Mach–Zehnder-interferometers
(MZI) is proposed to resolve the optical packet contending in the paper. A signal phase adjuster is designed for MZI lower
arms to change the optical signal phase difference between MZI upper arms and lower arms accurately. The SOA and input optical
signal parameters are discussed and analyzed to optimize the scheme wavelength conversion performance for all-optical switching
networks. Numerical analysis and simulation show that more than 20 dB contrast ratio can be achieved for the wavelength conversion
at 40 Gbps. In addition, the system is simple structure, stable and photonic integratable. 相似文献
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提出了一种基于半导体光放大器(SOA)的组播实验方案,首先利用谱展宽和谱切片得到多波长脉冲源,将其作为探测光并与信号光共同注入到SOA中,利用SOA的交叉增益调制(XGM)效应,信号光与每一个波长的脉冲光发生作用,在SOA输出端通过可调光带通滤波器(TBDF)得到每一波长的变换后信号,实现光信号的组播过程。在实验中,10 Gb/s的归零(RZ)码作为信号光,而由多波长脉冲源产生的4波长脉冲光作为探测光,在探测光波长附近分别得到了与编码信号光逻辑取"非"的信号。 相似文献
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A novel scheme for all-optical ultra-wideband triplet signal pulse generation based on the cross-gain modulation (XGM) in a single semiconductor optical amplifier (SOA) is demonstrated. In this scheme, only one optical source and one SOA are needed, so the configuration is simple. Due to only one wavelength is included in the generated triplet pulse, no time difference between output signal light and probe light is introduced during the transmission process. By using the software of Optisystem 7.0, the impacts of the input signal width, the optical power and the wavelength of the optical source on the generated triplet pulse are numerically simulated and studied. The results show that the proposed scheme has better triplet signal pulse when the input signal pulse width is larger, and it is insensitive to the wavelength change within a certain range. 相似文献
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We propose a novel ultra-wideband (UWB) triplet signal source based on the cross-gain modulation (XGM) in semiconductor optical amplifier (SOA). In the proposed scheme, only an optical source and two SOAs are needed, so the all-optical structure is compact. A triplet optical pulse with center frequency of 6.25 GHz and fractional bandwidth of 83% is obtained by the scheme. The extinction ratio can be improved by the counter-propagating scheme. The triplet pulse signal with only one wavelength can be easily controlled, and can aviod the dispersion effect. The output triplet pulse signal is insensitive to the light wavelength shifts, its available wavelength range is wide, the dynamic range of the input power is more than 6 dBm, and the bias current of the SOAs is exhibited. 相似文献
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All-optical ultra-wideband doublet signal source based on the cross-gain modulation in a semiconductor optical amplifier 下载免费PDF全文
Zhao Zan-shan Li Pei-li Zheng Jia-jin Pan Ting-ting Huang Shi-jie Luo You-hong 《光电子快报》2012,8(2):89-92
We propose a novel scheme to generate the ultra-wideband (UWB) doublet signal pulse based on the cross-gain modulation (XGM) in a semiconductor optical amplifier (SOA). In the scheme, only an optical source and an SOA are needed. As there is only one wavelength included in the output doublet signal pulse, no time difference between the upper and down pulses is introduced during the transmission process. By using the software of Optisystem 7.0, the impacts of the optical power, the SOA current, the wavelength and the input signal pulse width on the generated doublet pulse are simulated and tudied numerically. The results show that when the pulse width of the input signal pulse is larger, the output signal pulse is better, and is insensitive to the change of wavelength. In addition, the ultra-wideband positive and negative monocycles can be generated by choosing suitable optical source power and SOA current. 相似文献