Abstract

We observe an interference pattern using a simple fiber-optic interferometer consisting of an electrical spectrum analyzer and a narrowband light source, which is commonly employed for observing the Brillouin gain spectrum. This interference pattern expands well beyond the frequency range corresponding to the Brillouin frequency shift in silica fibers (∼11 GHz at 1.55 μm). Using both silica single-mode and polymer optical sensing fibers, we then experimentally prove that the distinctive noise in a self-heterodyne-based Brillouin measurement with an unoptimized polarization state originates from the interference between the reference light and the Fresnel-reflected light. This noise can be almost completely suppressed by employing a delay line that is longer than the coherence length of the light source and by artificially applying a high loss near the open end of the sensing fiber.

© 2014 IEEE

Observation of stimulated Brillouin scattering in polymer optical fiber with pump–probe technique

Yosuke Mizuno, Masato Kishi, Kazuo Hotate, Takaaki Ishigure, and Kentaro Nakamura
Opt. Lett. 36(12) 2378-2380 (2011)

Noise suppression technique for distributed Brillouin sensing with polymer optical fibers

Yosuke Mizuno, Heeyoung Lee, Neisei Hayashi, and Kentaro Nakamura
Opt. Lett. 44(8) 2097-2100 (2019)

Characterization of evolution of mode coupling in a graded-index polymer optical fiber by using Brillouin optical time-domain analysis

Yongkang Dong, Pengbai Xu, Hongying Zhang, Zhiwei Lu, Liang Chen, and Xiaoyi Bao
Opt. Express 22(22) 26510-26516 (2014)

Brillouin characterization of slimmed polymer optical fibers for strain sensing with extremely wide dynamic range

Yosuke Mizuno, Natsuki Matsutani, Neisei Hayashi, Heeyoung Lee, Masaki Tahara, Hideki Hosoda, and Kentaro Nakamura
Opt. Express 26(21) 28030-28037 (2018)

Brillouin gain spectrum dependence on large strain in perfluorinated graded-index polymer optical fiber

Neisei Hayashi, Yosuke Mizuno, and Kentaro Nakamura
Opt. Express 20(19) 21101-21106 (2012)