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中国科学院合肥物质科学研究院专利：co激光腔镜波长选择装置
中国科学院合肥物质科学研究院 专利 激光腔镜 波长选择装置
2023/12/14
中国科学院合肥物质科学研究院专利：co激光腔镜波长选择装置
中国科学院合肥物质科学研究院专利：波长自选的封离式co*激光谐振腔
中国科学院合肥物质科学研究院 专利 波长自选 封离式 co*激光谐振腔
2023/12/14
中国科学院合肥物质科学研究院专利：波长自选的封离式co*激光谐振腔
针对相干光正交频分复用系统中出现的高峰值平均功率比问题,提出用小波包变换取代传统快速傅里叶变换的相干光正交频分复用系统.仿真实验证明了具有良好正交性的小波包变换对高峰值平均功率比起到一定程度上的抑制作用,且误码率性能优于传统的快速傅里叶变换.随着小波尺度函数及小波函数对称性的提升,其避免信号处理过程中的相移的能力提高,系统性能有所改善.与传统的快速傅里叶变换系统相比,基于小波包变换的系统中,小波基...
针对"水窗"波段(280~540 eV)对多层膜反射镜的应用需求,在Ti的L吸收边(452.5 eV)附近,优化设计了Co/Ti多层膜的膜系结构.计算了不同界面粗糙度条件下的反射率,结果显示,界面粗糙度对多层膜反射率有较大影响.采用直流磁控溅射方法在超光滑硅基片上制备了Co/Ti多层膜,通过将氮气引入原有的溅射气体氩气中作为反应气体,明显减小了制备的多层膜的界面粗糙度.利用X射线掠入射反射实验和透...
尖晶石Mn-Co-Ni-O三元氧化物具有优良的负温度系数（NTC），是一种制作热敏红外探测器较为理想的材料。采用射频磁控溅射法在非晶Al2O3衬底上制备了Mn1.56Co0.96Ni0.48O4（MCNO）多晶薄膜。使用能量色散X射线谱（EDS）对薄膜中金属元素组分进行了测量，分析得出薄膜中金属元素组分与靶材中的组分偏离在5%以内。对经过750℃空气中退火后的薄膜结构、电学和光学性质也进行了研究。...
Oxygen and Nitrogen Co-Doped GeSbTe Thin Films for Phase-Change Optical Recording
GeSbTe recording layer oxygen and nitrogen doping optical constants microstructure crystallization temperatures phase-change optical disks
2011/11/28
Nitrogen and oxygen co-doped GeSbTe films for phase-change optical recording are investigated. It is found that optical properties of amorphous and crystalline state are similar to that of GeSbTe, cry...
The orientation of element-specific moments was determined by using x-ray magnetic circular dichroism spectroscopy to explore exchange anisotropy of TbFe/Co bilayers. Perpendicular anisotropy of 15 ?C...
掺Co钨酸镉单晶体的坩埚下降生长及光谱特性
Co离子 钨酸镉晶体 坩埚下降法 光谱
2012/4/16
应用坩埚下降法，采用70 ℃·cm-1的固液界面温度梯度与0.50 mm·h-1生长速度，生长出了初始Co掺杂摩尔百分浓度为0.5 mol%、尺寸为Ф25 mm×120 mm的钨酸镉单晶体。晶体呈透明深蓝色。用XRD表征了获得的晶体。观测到518，564和655 nm三个可见波段吸收带以及发光中心1 863 nm(1 323～2 220 nm)的超宽吸收带。可见波段的吸收归属于Co2+在八面晶格场...
Experimental Demonstration of XPM Compensation for CO-OFDM Systems with Periodic Dispersion Maps
Fiber optics communications Modulation Nonlinear Optics fibers.
2015/5/26
We experimentally demonstrate compensation of XPM for CO-OFDM systems operating in a periodic dispersion map using a low-bandwidth compensator. The nonlinear threshold was increased by 4 dB in a 22.5 ...
Interplay between PMD and Nonlinearity in 112 Gb/s DP-QPSK Transmission with Co-propagating 10.7 Gb/s NRZ Channels
Fiber optics communications Coherent communications
2015/5/26
We experimentally demonstrate interplay between PMD and nonlinearity in 112 Gb/s DP-QPSK signal transmission with 10.7 Gb/s NRZ neighbors can have both positive and negative impact depending on channe...
Impact of Intra-Channel Fiber Nonlinearity on Reduced- Guard-Interval CO-OFDM Transmission
Coherent communications Fiber optics communications Modulation
2015/5/26
Channel estimation for a reduced-guard-interval (RGI) CO-OFDM system shows a unique dependence on the training symbol design in the presence of intra-channel nonlinearities.Because smaller FFT sizes c...
Reduced-Guard-Interval CO-OFDM with Overlapped Frequency-Domain CD and PMD Equalization
Reduced-Guard-Interval CO-OFDM Overlapped Frequency-Domain CD PMD Equalization
2015/5/25
We propose an algorithm for CO-OFDM receivers to perform overlapped frequency-domain CD and PMD equalization before OFDM symbol demodulation. This approach enables OFDM transmission with a small cycli...
Scattered Pilot Channel Tracking Method for PDM-CO- OFDM Transmissions Using Polar-Based Intra-Symbol Frequency-Domain Average
Fiber optics communications Modulation
2015/5/25
We have demonstrated an efficient scattered pilot channel tracking approach with a new polar-based intra-symbol frequency domain average (ISFA) for 16-QAM, 40-Gb/s PDM-CO-OFDM systems. This proposal c...
Real-time CO-OFDM transmitters and receivers for 10.5Gb/s bit-rate implemented in FPGAs are reported applying 10GSa/s converters and entire algorithms for both terminals. The Q-factors are 22.7dB for ...
Hybrid 2.5G/10G Co-existing OFDMA-PON Employing Single Receiver at the OLT
Fiber optics communications Systems
2015/5/25
A 2.5G/10G co-existing OFDMA-PON is demonstrated through 20km SSMF with 31dB loss budget. Only one receiver at the OLT and low-speed transceiver at the 2.5G ONUs are required, thereby reducing system ...