复合纺丝法制备聚合物瓣状光纤的研究

瓣状光纤(SCF)由高折射率均匀芯层和高低折射率区域交替的皮层组成, 可有效地实现大纤芯单模运行。提出了采用复合纺丝法一步制备瓣状光纤。采用聚碳酸酯(PC)和聚甲基丙烯酸甲酯(PMMA)成功地制备截面符合设计要求的聚合物瓣状光纤。所制光纤的纤芯直径为40 μm。并用白光作为光源, 考察了所制光纤在500～1000 nm波段范围的出射光谱。从出射光谱可以看出, 所制光纤在730～830 nm波段范围内透射率比较高。通过截断法对所得光纤在500～1000 nm波段范围的传输损耗进行测试, 结果表明所制光纤的传输损耗比较大, 最大为30 dB/m。采用532 nm绿色激光作为光源, 通过CCD采集60 cm所得光纤的光斑。

Study on Fabricating Polymer Segmented Cladding Fiber by Bicomponent Spinning

A segmented-cladding fiber (SCF), which consists of a uniform core of high refractive index and a cladding with regions of high and low refractive index alternating angularly, provides an effective approach for achieving widely extended single-mode operation with a large core size. Fabricating segmented cladding fiber by bicomponent spinning method was proposed. The polymer segmented cladding fiber with required cross section was successfully fabricated using polycarbonate (PC) and polymethyl methacrylate (PMMA). The core of obtained fiber is 40 μm in diameter. The output spectrum of obtained fiber was investigated using white light as the light source. From the output spectra, it was seen that the intensity in the wavelength of 730～830 nm is comparatively higher in the test range of 500～1000 nm. The transmission loss in the wavelength of 500～1000 nm was tested by the cut-back method. The result showed that the transmission loss of the obtained fiber is comparatively high, being up to 30 dB/m. The output light pattern of the obtained fiber of 60 cm was collected by a CCD camera with laser light of 532 nm as the input.