布拉格光纖光柵輻射角度之量測與分析

本實驗一開始先使用ISUTS儀器量測來分析光纖光柵的二階光敏載氫曝光3min、5min和7min頻譜，接著以相同材質PS1500的光纖製作成為光纖光柵，再來結合了步進馬達做輻射角度的量測，發現二階光敏載氫曝光3min、5min和7min在角度41.4°、90°和133.2°附近有輻射角度大小的能量出現，另外在與光柵夾角90˚有輻射光，且有小的發散角(Narrow Beam Divergence)，同時我們也量測在不同波長之下，其輻射大小與角度的變化。其中光源由-Z方向傳輸在角度133.2°附近有輻射能量最大值出現-26.94dB。本研究為了想了解二階光纖光柵在輻射角度41.4˚與133.2˚的輻射角度大小的產生，因此改變光纖光柵的光源入射方向，光源入射由+Z方向傳輸，來觀察輻射角度的大小，針對入光點與出光點的輻射角度大小參數進行比較，並探討我們量測二階FBGs的輻射效率與角度大小關係的變化。

關鍵字

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並列摘要

In this thesis, second-order fiber Bragg gratings (FBGs) are fabricated by hydrogen- loaded photosensitive fiber (PS1500). The radiated angle of three second-order FBGs are measured in this study, where the exposure time of three FBGS are 3 min., 5 min., and 7 min., respectively. Three radiation angles, which are around 41.4°, 90°, and 133.2°, are measured for +z direction propagated light. Those radiation angles show the properties of narrow beam divergence. The lights are excited by two propagation directions, +z and –z direction. For the maximum radiated angle change with respect to propagation direction. The experiment shows that the radiated angles of 41.4° and 133.2° are caused by the discontinuous interfaces between gratings and non-grating region.

並列關鍵字

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參考文獻

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[2] Kenneth. O. Hill and Gerald Meltz, “Fiber Bragg Grating Technology Fundamentals and Overview,” J. Lightwave Technol., vol. 15, No. 8, pp. 1263-1276, Auguset 1997.

[5] T. Erdogan, “Cladding-mod resonances in short- and long-period fiber grating filters,” J. Opt. Soc. Am A Vol. 14, pp. 1760-1773, 1996

[6] T. Erdogen and J. E. Sipe, “Tilted fiber phase gratings”, J. Opt. Soc. Am. A, Vol. 13, No. 2, pp.296-313, 1996.

[7] N. H. Sun et al., “Second-Order Fiber Bragg Gratings,” in OECC 2009, paper WG6.

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布拉格光纖光柵輻射角度之量測與分析

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