CAJ | 학술논문

通过改变种子光栅中相邻子光栅的折射率调制量,提出一种新型交错型采样光纤Bragg光栅(ISFBG)设计,并利用传输矩阵法分析ISFBG的反射谱特性.结果表明:对种子光栅中相邻子光栅的折射率设计不同的调制量,ISFBG的反射谱信道教增加,主反射峰的反射率主要由折射率调制量大的子光栅决定,并且其反射率的大小随着折射率调制量差值的增大下降,次反射峰均匀地分布于每两个主反射峰之间,其反射率的大小随着折射率调制量差值的增大而增大.同时,在设计中采用多相移技术可以进一步压缩ISFG信道间隔,增加信道数量.
통과개변충자광책중상린자광책적절사솔조제량,제출일충신형교착형채양광섬Bragg광책(ISFBG)설계,병이용전수구진법분석ISFBG적반사보특성.결과표명:대충자광책중상린자광책적절사솔설계불동적조제량,ISFBG적반사보신도교증가,주반사봉적반사솔주요유절사솔조제량대적자광책결정,병차기반사솔적대소수착절사솔조제량차치적증대하강,차반사봉균균지분포우매량개주반사봉지간,기반사솔적대소수착절사솔조제량차치적증대이증대.동시,재설계중채용다상이기술가이진일보압축ISFG신도간격,증가신도수량.
Based on the index modulation method,an Interleaved Sampled Fiber Bragg Grating (ISFBG) is designed by changing the index modulations of the adjacent sub-gratings in each seeding grating.And the characteristic of reflecting spectrum of ISFBG is analyzed by transfer matrix method.The results show that the number of reflection channels of ISFBG can be tuned for the structure of adjacent sub-gratings with varying index modulations.The reflectivity of main reflection peaks is dependent on the sub-gratings with large index modulations and decreases slightly with the increase of index modulation difference.The secondary reflection peaks are uniformly distributed in the middle of two main reflection peaks and their reflectivity increases with the increment of index modulation difference.Furthermore,the channel spacing of ISFBG can be compressed with channel number increasing by the multiple-phase-shift technique.