一种双抽运结构C+L波段掺铒光纤宽带光源

介绍了一种结构简单、工作在C+L波段掺铒宽带光源。实验中用3dB宽带耦合器作为光纤反射镜,同时利用功率控制电路让光源输出光稳定,先用两个980nm二极管作为抽运源,将后向的C波段ASE重新引回光纤中,提高了抽运源的利用效率和光纤输出光的稳定性,优化掺铒光纤长度,获得了功率高达26.67mW(14.26dBm)的C+L波段ASE光输出,平均波长1550.887nm。之后采用一个980nm和一个1480nm的激光二极管,在输出相对平坦的情况下,得到了最高功率为23.23mW(13.66dBm),平均波长为1556.46nm的C+L波段ASE光输出,光纤环形镜的使用,不仅改善了光源的平坦度,并且大大提高了光光转化效率。     

聚合物光纤损耗及光谱特性的测量分析

聚合物光纤（POFs）的参数直接反映了POFs的特性,为了更好地了解POFs的性能,探索POFs的测量方法,对POFs的传输损耗光潜特性进行了理论和实验研究。分析了POFs的传输损耗特性以及与波长的相关性,利用剪断法和光谱分析法对POFs的传输损耗和光谱特性进行测定,最后测得在550～670nm波长范围内聚甲基丙烯酸甲酯（PMMA）阶跃型POFs的传输损耗光谱特性。结果娃示,PMMA阶跃型POFs在510～580nm和650nm的波长范围内有较低的损耗。     

Adaptive optical design in surface plasma resonance sensor

A double-prism adaptive optical design in surface plasma resonance （SPR） sensor is proposed,which consists of two identical isosceles right-triangular prisms. One prism is used as a component of Kretschmann configuration, and the other is for regulation of the optical path. When double-prism structure is angle-scanned by an immovable incident ray, the output ray will be always parallel with the incident ray and just has a small displacement with the shift of output point. The output ray can be focused on a fixed photodetector by a convex lens. Thus it can be avoided that a prism and a photodetector rotate by 8 and 28 respectively in conventional angular scanning SPR sensor. This new design reduces the number of the movable components, makes the structure simple and compact, and makes the manipulation convenient.     

PCCC for the performance improvement of the wireless optical communication system

Opticalwireless,alsoknownasfree spaceoptics,isa cost effectiveandwidebandwidthaccesstechniqueandreceivesgrowingattentionwithrecentcommercialization success.Buttheperformanceofwirelessopticalcommu nicationwouldbeimpairedintheatmosphericchannelbyattenuation…     

Simulation of chaotic synchronization communication system based on incoherent optical feedback and injection

Chaotic communicationis of great interest because ofa potential applications in secure communications andspread spectrumcommunications .Asemiconductor lasersubject to optical feedback is known to have complexdynamic behavior ,and it can produce chaotic wa…     

Generation of low jitter and discrete tunable dual-wavelength optical pulses at arbitrary repetition rates

Recently there is an increasing interest in generatingshort optical pulses with lowti ming jitter and tuneablemulti-wavelength due toitsi mportant applicationin op-tical ti me division multiplexed(OTDM),wavelength di-vision multiplexed(WDM)systems,and opt…     

Demodulated method of optical fiber stokes temperature sensors

The optical fiber temperature sensoris one of the dis-tributed measurement apparatus applied to the smartstructures of civil and military engineering.In the dis-tributedfiber Ramantemperature sensor ,the anti-Stokesand Stokes scattering radiation is sensi…     

微分Haar-Gaussian小波变换在大景深物体边缘测量中的应用

提出了微分Haar_Gaussian小波变换算法并将其应用于边缘检测,在空域和频域中进行变换,并应用带宽匹配方法和远心测量光学系统,提高了运算速度,通过对实际大景深物体离焦像的边缘测量,得到了准确的结果。     

3-溴-4-丁氧基-4'-硝基偶氮苯三阶非线性光学性能的研究

采用Z扫描技术对一种新的偶氮苯类化合物的三阶非线性光学系数进行了测量.实验结果的分析表明,该化合物具有较大的三阶非线性极化率;其三阶非线性主要来源于强的π电子离域性.     

校正空间分块镜复位误差所需的最少自由度的确定

可收展式分块镜共相位成像技术是实现光学系统超大口径、超高分辨率成像的关键技术。分块镜复位误差会引起各子镜之间的共相位误差和整个拼接镜面的面形误差。合理确定校正分块镜复位误差所需的自由度具有非常重要的意义。计算机仿真分析了分块镜的复位误差对拼接镜面面形误差的影响。结果表明,所需的校正自由度的个数不仅与展开机构的复位精度有关,而且与分块镜镜面的几何参数有关。