摘要
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 a fiber Bragg grating（FBG） in an optical fiber coupler is a very effective way to implement an optical add/drop filter（OADF）.In order to analyze the influences on the bandwidth at the drop port of the OADF using fiber grating-assisted mismatched coupler,a uniform FBG and a linearly chirped FBG were written on the coupler,and two different OADFs were fabricated.The fiber grating is written in a 2×2 mismatched coupler,which is fused and tapered with a standard single mode fiber（SMF） and a high germanium doped photosensitive fiber,by using a 248 nm ultraviolet laser.For the OADF using the uniform FBG,the 3 dB and 20 dB bandwidths are 0.1 nm and 0.3 nm,respectively;for the OADF using the linear chirped FBG,the 3 dB and 20 dB bandwidths are 0.8 nm and 2 nm,respectively.The experimental results meet the theoretical analysis well.The bandwidth at the drop port of the device can be adjusted by adjusting the chirped coefficient of the linearly chirped FBG.
出处
《中国科学：信息科学》
CSCD
2012年第4期520-526,共7页
Scientia Sinica(Informationis)
基金
国家重点基础研究发展计划(批准号:2010CB328206)
国家高技术研究发展计划(批准号:2008AA01Z215)
国家自然科学基金(批准号:60837002)资助项目
关键词
光上下话路滤波器
光纤布拉格光栅
耦合器
光纤通信
光器件
optical add/drop filter
fiber Bragg grating
coupler
optical fiber communication
optical device
