Abstract

Fiber filters based on periodic cascaded tapered fiber sections are demonstrated. The filters consist of up to seven tapered sections separated periodically by more than 3 mm from center to center, with nominal tapered sections of $1\mathrm{mm}\times 1\mathrm{mm}\times 1\mathrm{mm}$ longitudinal dimensions. The transmission spectrum consists of discrete notches, resembling those observed in long-period fiber gratings, which differs from the observed spectrum in Mach–Zender interferometers based on cascaded tapers. Its sensitivity to external perturbations, such as refractive index or mechanical stress, made the device potentially very useful as a sensor or tunable filter.

© 2014 Optical Society of America

Spectrum evolution of cascaded mismatching long-period fiber gratings

Xuesong Liu, Li Zhan, Shouyu Luo, Zhaochang Gu, Jinmei Liu, and Qishun Shen
Appl. Opt. 51(9) 1367-1374 (2012)

Simultaneous strain and temperature measurement by cascading few-mode fiber and single-mode fiber long-period fiber gratings

Li Wang, Weigang Zhang, Biao Wang, Lei Chen, Zhiyong Bai, Shecheng Gao, Jieliang Li, Yongji Liu, Liyu Zhang, Quan Zhou, and Tieyi Yan
Appl. Opt. 53(30) 7045-7049 (2014)

Temperature sensing through long period fiber gratings mechanically induced on tapered optical fibers

María Guadalupe Pulido-Navarro, Ponciano Jorge Escamilla-Ambrosio, Sigifredo Marrujo-García, José Alfredo Álvarez-Chávez, and Fernando Martínez-Piñón
Appl. Opt. 56(19) 5526-5531 (2017)

Long-period grating fabricated by periodically tapering standard single-mode fiber

Li-Yang Shao, Jian Zhao, Xinyong Dong, H. Y. Tam, C. Lu, and Sailing He
Appl. Opt. 47(10) 1549-1552 (2008)

Design and analysis of long-period fiber gratings in tapered multimode chalcogenide glass fiber for temperature measurement

Leilei Wang, Wenqiang Ma, Peiqing Zhang, Dandan Yang, Liang Zhu, Xunsi Wang, and Shixun Dai
J. Opt. Soc. Am. B 36(7) 1792-1798 (2019)