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We investigate the temperature dependence of radiation-induced attenuation (RIA) at 1 310 nm for a Ge/P co-doped fiber after a steady-state γ-ray irradiation.A γ irradiation facility 60Co source is used to irradiate the fiber at a dose rate of 0.5 Gy/min,satisfying a total dose of 100 Gy.The test temperature ranges from-40 to 60℃ by 20℃,and the RIA of the fiber is obtained using a power measuring device.The experimental result demonstrates that RIA exhibits a steady,monotonic,and remarkable temperature dependence after approximately 48h of accelerated annealing at 70℃.The optical fiber irradiated with a high dose and annealed sufficiently can be used as a temperature sensor. 相似文献
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LED光学传播的有限元研究 总被引:1,自引:1,他引:0
有限时域差分(FDTD)广泛应用于提高发光二极管(LED)芯片外量子效率.这种方法是针对波导结构的一种分析计算,对于激光器是有效的,但是对LED很难模拟其有源层多种模式出射的情况.应用有限元电磁场分析方法对LED进行光学建模并对光子晶体结构的外量子效率进行了计算.特别在对光源的处理上,使用了点光源球面波来进行分析并且考... 相似文献
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作为一种新颖的MEMS器件,光栅光阀(GLV)被应用于高清晰数字电视和光通信的动态增益均衡(DGE)上,使用角度谱方法分析了这种光调制器的衰减机理,并对其仿真,得到了输入光衰减的曲线。在长距离传输过程中,由于多个EDFA级联产生的非线性,提出了对增益进行动态均衡的要求。基于GLV可以集成为一维阵列的特点,提出了基于这种光调制器的动态增益均衡器的结构,并进行了4路输入光信号的功率均衡实验,在实验中,输出的光功率可以衰减10dB以上,纹波可以控制在0.5dB以内。 相似文献
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在长距离骨干网和光节点中,多个掺铒光纤放大器(EDFA)级联造成纹波及在光节点进行波长上下载时,由于通道中信号光的功率改变从而使EDFA的增益曲线也会变化,由此产生的非线性提出了对增益进行动态均衡的要求,对通道光功率的动态均衡是非常必要的。介绍了一种基于微机电系统(MEMS)反射镜阵列的动态通道均衡器(DCE)。为了优化其动态特性,需要对敛动器进行建模并优化控制算法,通过数值分析和实验数据确定模型参数,并且仿真结果与实验符合。最后,进行了4通道的动态均衡实验,系统响应时间小于5ms,信号的超调量得到了改善,纹波可以控制在0.5dB以内。 相似文献
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We investigated the steady state gamma-ray radiation response of pure-silica-core photonic crystal fibers(PSC-PCFs)under an accumulated dose of 500 Gy and a dose rate of 2.38 Gy/min. The radiation-induced attenuation(RIA) spectra in the near-infrared region from 800 nm to 1700 nm were obtained. We find that the RIA at 1550 nm is related with hydroxyl(OH-) absorption defects in addition to the identified self-trapped hole(STH) defects. Moreover, it is proposed and demonstrated that reduced OH-absorption defects can decrease the RIA at 1550 nm. The RIA at 1550 nm has effectively declined from 27.7 d B/km to 3.0 dB/km through fabrication improvement. Preliminary explanations based on the unique fabrication processes were given to interpret the RIA characteristics of PSC-PCFs. The results show that the PSC-PCFs,which offer great advantages over conventional fibers, are promising and applicable to fiber sensors in harsh environments. 相似文献
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