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Light-light control type communication devices using optical fiber micro-machining and photochromism phenomenon

利用光纤微加工和光致变色现象的光光控制型通信装置

基本信息

批准号：
14550249
负责人：
KUMAZAKI Hironori
金额：
$ 2.69万
依托单位：
Gifu National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

First, the photochromic material (A mixture of diarylethene and Optodyne UV-1100 at a mass ratio of 1:9) was applied for use with a thinned single-mode fiber as a variable attenuator for light-light control. The length and diameter of the thinned region on the fiber was 45 mm and 18 μm, respectively. Light from a halogen lamp (250 W) was focused on the input side of the thinned optical fiber. The thinned region was surrounded by photochromic material at a thickness of about 500 μm, and the temperature of the system was maintained at 25 ℃. The insertion loss of the attenuator was determined from the transmitted light spectrum, as measured using an optical spectrum analyzer at the output end of the fiber while the photochromic material was irradiated with UV light. The insertion loss decreased by about 9.5 dB after irradiation for 14 min. The refractive index change of the photochromic material was then estimated from the experimental results. When glycerine was used as an additional cla … More dding layer around the thinned optical fiber (length : 20 mm, diameter: 18 μm), the insertion loss decreased by about 15 dB with a temperature increase of 60 ℃, resulting in a refractive index change of 0.0132 in glycerine. Assuming that the insertion loss is proportional to the length of the thinned region, the refractive index change of the photochromic material can be estimated to be about 0.005. Next, a similar system was examined for use as a tunable wavelength filter. In this case, a thinned grating fiber (10/120 μm core/cladding diameter, 1550 nm grating wavelength, 10 mm grating region) was used. The length and diameter of the thinned region including the grating was 45 mm and 20 μm, respectively. Light from a halogen lamp (250 W) was focused on the input end of the thinned optical fiber. The thinned region was surrounded by photochromic material at a thickness of about 200 μm, and the temperature was maintained constant at 80 ℃ using a thermostated water bath. The high temperature was required to reduce the refractive index of the photochromic material to close to that of the cladding (1.458). The center reflection wavelength was determined from the transmitted light spectrum measured using an optical spectrum analyzer at the output end of the fiber while the photochromic material was irradiated with UV light The center reflection wavelength decreased by about 0.2 nm after irradiation for 10 min. A larger wavelength shift can be expected if a polymer with a lower refractive index is adopted for the photochromic material, as suggested by the high shift rate at the beginning of UV irradiation. Less

首先，将光致变色材料（二芳基乙烯和Optodyne UV-1100质量比为1:9的混合物）与细化单模光纤一起用作光-光控制的可变衰减器。光纤上减薄区域的长度和直径分别为45 mm和18 μm。来自卤素灯 (250 W) 的光聚焦在细化光纤的输入侧。减薄区域周围覆盖厚度约为500μm的光致变色材料，系统温度保持在25℃。衰减器的插入损耗是根据透射光谱确定的，该光谱是在用紫外光照射光致变色材料时在光纤输出端使用光谱分析仪进行测量的。照射14分钟后插入损耗下降约9.5dB。然后根据实验结果估计光致变色材料的折射率变化。当甘油用作细化光纤（长度：20 mm，直径：18 μm）周围的附加镀层时，随着温度升高 60 ℃，插入损耗下降约 15 dB，导致甘油的折射率变化为 0.0132。假设插入损耗与减薄区域的长度成正比，则光致变色材料的折射率变化可估计为约0.005。接下来，检查了一个类似的系统用作可调谐波长滤波器。在这种情况下，使用细化光栅光纤（10/120μm纤芯/包层直径、1550nm光栅波长、10mm光栅区域）。包括光栅在内的减薄区域的长度和直径分别为45mm和20μm。来自卤素灯 (250 W) 的光聚焦在细化光纤的输入端。减薄区域周围覆盖厚度约200μm的光致变色材料，并使用恒温水浴将温度保持恒定在80℃。需要高温才能将光致变色材料的折射率降低到接近包层的折射率（1.458）。当用UV光照射光致变色材料时，从使用光谱分析仪在光纤输出端测量的透射光光谱确定中心反射波长。照射10分钟后，中心反射波长减少约0.2nm。如果光致变色材料采用折射率较低的聚合物，则可以预期更大的波长偏移，正如紫外线照射开始时的高偏移率所表明的那样。较少的