排序方式: 共有57条查询结果,搜索用时 4 毫秒
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一种高效率的L波段掺铒光纤ASE宽带光源 总被引:1,自引:1,他引:0
利用双程双向泵浦单级掺铒光纤的结构实现高效率的L波段掺铒光纤放大自发辐射输出,同时选择1480nm半导体激光器作为泵浦源,高掺杂铒光纤为增益介质,通过优化铒光纤长度,获得了在1566-1604 nm(38 nm),自发辐射谱功率高于-16 dBm,总输出功率13.7 dBm的L波段掺铒光纤放大自发辐射光源.该光源结构相比于双程前向泵浦结构的L波段掺铒光纤放大自发辐射光源,其泵浦效率从11.8%提高到23.4%. 相似文献
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为了实现可调谐双波长激光输出,提出并设计了一种基于自反馈光注入结构的掺Er3+光纤(EDF)激光器,并对激光器的基本原理及实现方案进行了理论分析和实验验证。系统结构设计采用976nm波长的LD作为泵浦源,结合EDF,两支光纤布拉格光栅(FBG)和光纤环形镜(FLM)产生激光,并通过在FLM中熔接饱和吸收体(SA)起到稳频作用;将FLM输出激光耦合进入谐振腔形成自注入结构,与腔内振荡激光形成干涉,抑制模式跳变;通过控制两支FBG之间的可调谐衰减器调节谐振腔内的增益和损耗,实现单个波长或双波长输出。实验结果表明:SA长采用4m、EDF长采用6m时,激光输出阈值为28mW,将反馈光注入谐振腔后,系统阈值为25mW,输出激光波长随时间漂移得到明显抑制;当泵浦光功率为80mW时,通过调节位于两支FBG之间的可调谐衰减器(VA)获得稳定的双波长激光输出;随着泵浦功率增加,激光输出功率具有良好的线性度和稳定性。在1 540nm波长处激光输出最大功率为1.16mW,信噪比(SNR)大于50dB;在1 545nm波长处激光输出最大功率为1.89mW,SNR大于50dB。 相似文献
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ZHANG Qi-zhi 《中国邮电高校学报(英文版)》2008,15(1):43-47
After analyzing the features of the Parlay application server(AS), which provides many services with different time constraints in the next generation network(NGN), a selfadapted overload control algorithm implemented in Parlay AS is proposed. In this algorithm, the service process module in parlay AS uses the earliest deadline first (EDF) serving rule to serve messages, and the overload control mechanism, using the Leaky Bucket algorithm to control message flows, is triggered by estimating the queue waiting time of a newly arriving message. By simulation it shows that this algorithm is a simple, easy-to-use, and available algorithm. 相似文献
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Jacquet Philippe Minet Pascale Mühlethaler Paul Rivierre Nicolas 《Wireless Personal Communications》1997,4(1):65-80
HIPERLAN offers a high speed (23.5 Mbit/s) radio LAN and therefore HIPERLAN is likely to support various kinds of traffic requirements. A Data Transfer function is in charge of handling various traffics which can result in simultaneous services. HIPERLAN nodes are not necessarily within direct radio range; and in some cases packets are forwarded by intermediate stations from the source node to the destination node. Since HIPERLAN is more than a single hop network, the support of specific traffics like Time Bounded traffics require a dedicated architecture which can not be centralized. This paper describes the architecture of the Data Transfer in HIPERLAN which allows the support of various traffics. This approach is not based on a connection oriented protocol nor on a centralized architecture but on a connection-less mode where users provide quality of services parameters to indicate its requirements. HIPERLAN architecture for data transfer is based on a mix of two main mechanisms: hierarchically independent priority levels and an earliest dead line first algorithm. This paper describes and explains the architecture choices made in HIPERLAN. Results of simulation and analytical models are given. 相似文献
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掺铒光纤放大器特性分析及长度优化设计 总被引:1,自引:0,他引:1
掺饵光纤放大器(EDFA)是光纤通信系统中的关键器件之一。文中从EDFA的基本理论出发,对EDFA的各种特性进行了计算机模拟分析,并研究了EDFA的长度优化设计,实验结果与理论计算相吻合。 相似文献
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石墨烯被动锁模谐波阶数可调的掺铒光纤孤子激光器 总被引:2,自引:2,他引:0
采用石墨烯被动锁模的掺Er光纤(EDF)环形腔,获得稳定的谐波阶数可调的孤子脉冲激光。通过调节EDF环形腔中的偏振控制器(PC)改变光腔损耗,实现了锁模谐波从一阶至四阶的可控运转。连续锁模基频重复频率为3.873MHz,中心波长为1 557.6nm,谱线宽度为4.5nm,有明显孤子边带,信噪比(SNR)约为45dB,二、三和四次谐波锁模脉冲重复频率分别为7.745、11.618和15.491MHz。本文的实验结果可用工作于反常色散区锁模激光器的多孤子形成机理来解释。 相似文献