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Excess loss on the short wavelength side of the Bragg resonant wavelength caused by cladding mode coupling limits wide use of grating in the fiber communication system, especially in densed wavelength division multiplexing (DWDM) system.A novel photosensitive fiber design that have depressed cladding and photosensitive inner cladding in the same fiber is proposed, which can suppress cladding mode coupling greatly.Using MCVD method B/Ge codoped fiber with depressed cladding was fabriceted out, which was also doped in boron and germanium and had the photosensitivity.Finally, the transmission spectrum of written grating in this fiber by phase mask method verified its larger photosensitivity and greatly suppression of cladding mode coupling. 相似文献
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非晶硅薄膜的高速沉积是非晶硅太阳电池低成本,大规模生产和推广应用的关键技术之一.我们采用预热反应气体.在小的射频功率流密度条件下.用热催化等离子体化学气相沉积方法.获得了沉积速率为20×10~(-10)m/s光敏性达10~5的优质非晶硅薄膜. 相似文献
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从光的强度、光的波长、光的入射方向和光照时间等几个方面对叶绿素光电化学电池的光灵敏性进行了研究,光强对电池的光电压和光电流都有影响。电流的作用光谱与叶绿素a的吸收光谱基本一致。正方向照射时,电池的光电压和光电流都比反向照射时大,连续长期的光照后,光电压没有明显的变化。对以上的实验结果作了理论说明。 相似文献
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