단일모드 광섬유의 복굴절에 따른 브릴루앙 동적 격자의 스펙트럼 변화

초록

The effects of linear or circular birefringence on the operation of Brillouin dynamic grating are investigated experimentally which are induced by bending or twisting a single-mode optical fiber. Results show that the reflection spectrum of the dynamic grating in a 5 m fiber is split by bend-induced linear birefringence with the separation frequency dependent on the bending diameter, matching well with the theoretical model. Meanwhile, the spectrum is almost immune to circular birefringence induced by twist with a rate of up to 24 turns / m.