Fourier-domain low-coherence interferometry for differential mode delay analysis of an optical fiber.
We propose a novel mode analysis and differential mode delay measurement method for an optical fiber using Fourier-domain low-coherence interferometry. A spectral interferometer based on a Mach-Zehnder interferometer setup was used with a broadband source and an optical spectrum analyzer to detect relative temporal delays between the guided modes of a few-mode optical fiber by analyzing spectral interference signals. We have shown that experimental results of the proposed method agree well with those results obtained by using a conventional time-domain measurement method. We have demonstrated that this new mode analysis technique has high sensitivity (<60 dB) and very good resolution (<1 ps/m).
Lee
Ji Yong
JY
Department of Information and Communications, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea. jylee@gist.ac.kr
Ahn
Tae-Jung
TJ
Moon
Sucbei
S
Youk
Young Chun
YC
Jung
Yong Min
YM
Oh
Kyunghwan
K
Kim
Dug Young
DY