排序方式: 共有14条查询结果,搜索用时 15 毫秒
1.
在空间相干光通信应用中,针对传统激光器线宽较宽、相位噪声大、易导致锁相环路失锁的问题,研制了单频Nd:YAG非平面环形(NPRO)激光器,其线宽小于1 kHz,相对强度噪声(RIN)低于-150 dB/Hz,具有窄线宽、低噪声的特点。搭建了光锁相环路,在信号光功率-67 dBm的情况下实现了两台NPRO激光器的相位锁定。在此基础上开展了信号频率为10 MHz和1.25 GHz的模拟通信实验,在信号光功率分别为-60 dBm和-53 dBm时可观测到较理想的眼图。在2.5 Gbps数字通信实验中,接收灵敏度达到-50 dBm,此时误码率为3.210-6。系统灵敏度可接近量子极限,明显优于传统的IM/DD方式,是一种适合长距离、大容量传输的空间通信方式。 相似文献
2.
Many experimental investigations on the temperature dependence of the refractive index of optical fibers have been reported previously, however a satisfying theoretical explanation for it is still absent. In this paper, a theoretical model about the temperature dependence of the refractive index of optical fibers is presented and it is in agreement with the previous experimental results. This work is a significant reference for the research and development of temperature sensors based on optical fiber delay lines. 相似文献
3.
4.
本文完整地展现了磁光薄膜中任意倾斜的外加直流偏置磁场对微波静磁波激发模式及其带宽的影响,实现了对不同静磁模的统一考虑,为进一步分析磁光Bragg器件的衍射性能提供理论基础.计算分析表明:(1)当外加偏置磁场的大小不变时,传统磁化情形下的静磁波带宽最大,此时基于MSBVW的磁光Bragg器件较相应的MSFVW器件有更高的工作频率;(2)在适当倾斜的偏置磁场作用下,静磁反向体波(MSBVW)、静磁正向体波(MSFVW)和静磁表面波(MSSW)均可被激发,它们的激发频率依次增大;(3)通过倾斜偏置磁场可使MSFVW的频带向高频移动. 相似文献
5.
6.
7.
We propose a Möbius-strip-type plasmonic cavity with a silver Möbius strip sandwiched between dielectric layers. By brief theoretical and simulation analyses, we obtain that the Q factor of the cavity remains about 40 and the mode volume is ultrasmall (less than 1 μm3) which is more compact than that of the cylindric cavity. This Möbius-strip-type plasmonic cavity supporting the propagation of surface plasmon polaritons owns some unusual properties such as more effective volume and the spatial separation. More potential applications based on this cavity remain to be explored in future nanophotonics. 相似文献
8.
9.
10.
线性调频CO_2激光的脉冲压缩 总被引:2,自引:1,他引:2
报道了用声光调制器对CO2激光进行线性调频,调频光信号通过光学自差检测再用声表面波色散延迟线压缩,得到的压缩脉宽达80ns.脉冲压缩比为100.还对实验系统和结果作了分析和讨论. 相似文献