排序方式: 共有6条查询结果,搜索用时 15 毫秒
1
1.
2.
A widely tunable microwave photonic notch filter with adjustable bandwidth based on multi-wavelength fiber laser is proposed and demonstrated. The multi-wavelength fiber laser generates the multi-taps of the microwave photonic filter (MPF). In order to obtain notch frequency response, a Fourier-domain optical processor (FD-OP) is introduced to control the amplitude and phase of the optical carrier and phase modulation sidebands. By adjusting the polarization controller (PC), different numbers of taps are got, such as 6, 8, 10 and 12. And the wavelength spacing of the multi-wavelength laser is 0.4 nm. The bandwidth of the notch filter is changed by adjusting the number of taps and the corresponding bandwidths are 4.41 GHz, 3.30 GHz, 2.64 GHz and 2.19 GHz, respectively. With the additional phase shift introduced by FD-OP, the notch position is continuously tuned in the whole free spectral range (FSR) of 27.94 GHz. The center frequency of the notch filter can be continuously tuned from 13.97 GHz to 41.91 GHz. This work has been supported by the National Natural Science Foundation of China (No.11444001), and the Municipal Natural Science Foundation of Tianjin in China (No.14JCYBJC16500). E-mail:cynever@163.com 相似文献
3.
4.
在大模型竞争中,微软超越谷歌等企业拔得头筹。这其中不免蕴含着技术与市场的“天时”以及资金与生态的“地利”,但这些都是驱使微软获得阶段性胜利的外部因素。真正让微软走出困境,重回科技舞台中心的内在因素是微软所具备的企业基因。本文基于企业基因视角,从基因突变、基因重组和物竞天择三个角度研究微软在此轮竞争中领先于谷歌的必然性,并从企业文化、业务匹配和内部验证三个方面为我国科技创新型企业提供启示与建议,助力科技创新型企业可持续发展。 相似文献
5.
<正>在数字经济时代,算力决定了数据要素转化成为经济社会价值的效率和效果,正逐步成为与数据要素相匹配的核心生产力;网络作为连接用户、数据、算力的“主动脉”,与算力的融合共生不断深入。作为有效承载并充分激发算力新动能的关键基础设施,算力网络应运而生,这既符合国家、社会、产业发展的战略要求,也是运营商转型发展的重要机遇。业界关于算力网络定义及技术要点的阐述已较为充分,但对产业现状的研究相对薄弱,因此本文将以产业链为切入点,绘制算力网络产业链图谱,剖析关键环节的发展情况,为运营商发展算力网络提供参考。 相似文献
6.
1