摘要
提出一种偏振分离型的光纤布拉格光栅(FBG)双向滤波器,可用在光纤激光陀螺(FLG)中产生双向单纵模激光。滤波器中采用偏振分离的办法,使双向的激光在0.1 nm带宽的光纤布拉格光栅中保持偏振态相互垂直,在减少了双向能量耦合的同时,隔绝了残余的背向反射,之后导入偏振分束器(PBS)产生双向激光。经测试滤波器的插入损耗约为3 dB,背向散射损耗比大于35 dB,将滤波器接入环行腔中可得到波长1550 nm,功率一致的双向激光输出,用扫描环形腔检验两路均为单纵模,实现了双向滤波的效果。
A structure of bidirectional filter to achieve single longitudinal mode for fiber laser gyro（FLG） application is demonstrated using a 0.1-nm bandwidth fiber Bragg grating（FBG） as a filter element.In filter section,the two direction lasers are kept orthogonal polarized as to keep counter-propagating mode coupling in minimum.Then a polarization beam splitter（PBS）is used to guide bidirectional laser out of filter.The insertion loss is about 3 dB and back reflection loss is more than 35 dB by test.The 1550 nm wavelength is gotten with the filter accessing to the ring cavity.Single longitudinal mode is certified for bidirectional laser output by using scanning ring resonator,which proves that the device is fit for bidirectional filtering.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2010年第7期1692-1696,共5页
Chinese Journal of Lasers
关键词
激光技术
双向滤波
偏振分离
光纤布拉格光栅
光纤激光陀螺
laser technique
bidirectional filter
polarization splitting
fiber Bragg grating
fiber laser gyro
