以體積型全像片研製分波多工元件

Study and Fabrication on Wavelength Division Multi/Demultiplexers by Using Volume Holograms

謝博任(Po-Jen Hsieh)

指導教授 ： 張明文 ； 陳祖龍 ； 蘇德欽

元智大學/工程學院/電機工程學系/碩士(2002年)

摘要

本論文提出以體積型全像光學元件，利用其特性來研製光纖通訊系統中的雙向分波多工元件。本文以1969年H. Kogelnik所提出的近似耦合波理論作基礎，由理論可知，體積型全像片的繞射效率與感光材料厚度、平均折射率、調制折射率及重建波長等有關，取其適當條件，可讓某一波長繞射效率最高而使其為繞射光，而其他波長對應之繞射效率最低而使其為透射光。基於此原理，我們設計一種可用於光纖通訊中，具有「波長區分」及「雙向傳輸」功能的雙向分波多工元件。為了證明此設計的可行性，我們以VRP-M鹵化銀全像材料，對重建波長分別為633nm，672nm，785nm等波長作模擬與實驗，來驗證本論文元件設計之可行性。由於全像元件具有製作容易、體積小、對光容易、成本低等許多優點，故對於光纖通訊之CWDM、DWDM及OADM元件，可利用此種設計來實現。

關鍵字

全像 ； 分波多工元件

並列摘要

In this study, we used a volume hologram to fabricate wavelength division multiplexer/demultiplexer for applications on optical communication. Based on the coupled-wave theory proposed by H. Kogelnik in 1969, the diffraction efficiency of a volume hologram obviously depends on the thickness of the emulsion, the average refraction index, the modulation index of the recording material, and the reconstructed wavelength. Under some proper condition, a volume holographic element with maximum diffraction efficiency turns out to be the chosen unit for diffraction, while others are chosen for the other wavelengths. Therefore, it can be used as a bi-directional wavelength multiplexer/demultiplexer for optical communication. In order to demonstrate its feasibility, silver halide emulsions have been used. Furthermore, we have chosen wavelengths of 633nm, 672nm, and 785nm as three reconstructed wavelengths in the investigation.

並列關鍵字

Holograms ； WDM ； Holograms ； Fabrication

參考文獻

1. D. Gabor, “A New Microscope Principle”, Nature, Vol.161, pp.777-778, (1948)

2. R. K. Curran, T. A. Shankoff, “The Mechanism of Hologram Formation in Dichromated Gelatin”, Appl. Opt., Vol. 9, pp.1651, (1970)

3. A. M. Webber, W. K. Smothers, T. J. Trout and D. J. Mickish, “Hologram Recording in Du Prnt’s New Photopolymers Materials”, Practical Hologaphy IV, SPIE OE/Lase, Conf. Proc. pp.1212-1204, (1990)

4. S. Reinhorn, Y. Amitai, A. A. Friesem, “Computer-Originated Planar Holographic Optical Elements”, Appl. Opt., Vol. 37, No. 14, pp.3031-3037,(1998)

5. S. H. Lee, “Computer Generated Holography: An Introduction”, Appl. Opt., Vol. 26, No. 20, pp.4350, (1987)