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在光纤耦合器的耦合区写入光纤布拉格光栅是实现全光纤型上下话路滤波器的一种有效方法.为了分析将均匀光纤布拉格光栅和线性啁啾光纤布拉格光栅分别写入光纤耦合器的耦合区时,对光纤光栅辅助失配耦合器型上下话路滤波器的下话路带宽的影响,采用波长为248nm的紫外光,在由标准单模光纤和高掺锗光敏光纤熔融拉锥制作的2×2光纤失配耦合器上分别写入均匀光纤布拉格光栅和线性啁啾光纤布拉格光栅,实验制作了均匀光纤布拉格光栅辅助失配耦合器型上下话路滤波器和线性啁啾光纤布拉格光栅辅助失配耦合器型上下话路滤波器.经测试,在下话路端口,前者的3dB带宽和20dB带宽分别约为0.1nm和0.3nm;后者的3dB带宽和20dB带宽分别约为0.8nm和2nm.实验结果与理论分析具有较好的一致性,这说明可以通过调节在光纤失配耦合器的耦合区的均匀部分写入的线性啁啾光纤布拉格光栅的啁啾量来调节所制器件的下话路带宽.
Writing fiber Bragg gratings in the coupling region of the fiber coupler is an effective way to realize the all fiber type up and down path filters.In order to analyze the coupling of the uniform fiber Bragg grating and the linear chirped fiber Bragg grating into the fiber coupler Region, the fiber grating auxiliary mismatch coupler type on-and-off path filter under the channel bandwidth, the use of wavelength of 248nm UV light in the standard single-mode fiber and highly doped germanium-doped optical fiber fused taper made A uniform fiber Bragg grating and a linear chirped fiber Bragg grating are respectively written on a 2 × 2 fiber mismatch coupler. A uniform fiber Bragg grating mismatch coupler type top-to-back channel filter and a linear chirped fiber Bragg grating grating Mismatched coupler type up and down path filter.Tested at the next port, the former 3dB bandwidth and 20dB bandwidth were about 0.1nm and 0.3nm; the latter 3dB bandwidth and 20dB bandwidth were about 0.8nm and 2nm The experimental results are in good agreement with the theoretical analysis, which shows that the linear chirp light written in the uniform part of the coupling region of the fiber mismatch coupler can be adjusted Fiber Bragg grating chirp to adjust the volume of the device under the telephone channel.