Measurements of spectral broadening and Doppler shift of backreflections from a fiber fuse using heterodyne detection.
We report broadening in spectrum as light is backreflected from a propagating fiber fuse. The formation of micrometer-size voids results in periodic changes in Fresnel reflection occurring in the leading part of the fuse. High-resolution measurement of the optical spectrum via heterodyne detection revealed an upshift (Doppler shift) in the optical frequency and discrete frequency components that are characteristic of amplitude modulation due to periodic void formation.
Photonic Network Group, National Institute of Information and Communications Technology,4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184-8795, Japan. abedin@nict.go.jp
Kazi S
KS
Abedin
Tetsuya
T
Miyazaki
Masataka
M
Nakazawa