TY - JOUR
T1 - Spectral dependence of transmission losses in high-index polymer coated no-core fibers
AU - Lian, Xiaokang
AU - Farrell, Gerald
AU - Wu, Qiang
AU - Han, Wei
AU - Shen, Changyu
AU - Ma, Youqiao
AU - Semenova, Yuliya
N1 - Funding Information:
Manuscript received May 19, 2020; revised July 2, 2020; accepted July 13, 2020. Date of publication July 17, 2020; date of current version November 16, 2020. This work was supported by the Technological University Dublin under Fiosraigh scholarship program. (Corresponding author: Xiaokang Lian.) Xiaokang Lian, Gerald Farrell, Wei Han, and Yuliya Semenova are with the Photonics Research Center, Technological University Dublin, Dublin D08 X622, Ireland (e-mail: [email protected]; [email protected]; [email protected]; [email protected]).
Publisher Copyright:
© 1983-2012 IEEE.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/11/15
Y1 - 2020/11/15
N2 - A high-index polymer coated no-core fiber (PC-NCF) is effectively a depressed core fiber, where the light is guided by the anti-resonant, inhibited coupling and total internal reflection effects, and the dispersion diagram shows periodic resonant and anti-resonant bands. In this article, the transmission spectra of the straight and bent PC-NCFs (length > 5 cm) are measured and analyzed from a modal dispersion perspective. For the purpose of the study, the PC-NCFs are contained within a fiber hetero-structure using two single-mode fiber (SMF) pigtails forming a SMF-PC-NCF-SMF structure. The anti-resonant spectral characteristics are suppressed by the multimode interference in the PC-NCF with a short fiber length. The increase of the length or fiber bending (bend radius > 28 cm) can make the anti-resonance dominate and result in the periodic transmission loss dips and variations in the depth of these loss dips, due to the different modal intensity distributions in different bands and the material absorption of the polymer. The PC-NCFs are expected to be used in many devices including curvature sensors and tunable loss filters, as the experiments show that the change of loss dip around 1550 nm is over 31 dB and the average sensitivity is up to 14.77 dB/m-1 in the bend radius range from ∞ to 47.48 cm. Our study details the general principles of the effect of high-index layers in the formation of the transmission loss dips in fiber optics.
AB - A high-index polymer coated no-core fiber (PC-NCF) is effectively a depressed core fiber, where the light is guided by the anti-resonant, inhibited coupling and total internal reflection effects, and the dispersion diagram shows periodic resonant and anti-resonant bands. In this article, the transmission spectra of the straight and bent PC-NCFs (length > 5 cm) are measured and analyzed from a modal dispersion perspective. For the purpose of the study, the PC-NCFs are contained within a fiber hetero-structure using two single-mode fiber (SMF) pigtails forming a SMF-PC-NCF-SMF structure. The anti-resonant spectral characteristics are suppressed by the multimode interference in the PC-NCF with a short fiber length. The increase of the length or fiber bending (bend radius > 28 cm) can make the anti-resonance dominate and result in the periodic transmission loss dips and variations in the depth of these loss dips, due to the different modal intensity distributions in different bands and the material absorption of the polymer. The PC-NCFs are expected to be used in many devices including curvature sensors and tunable loss filters, as the experiments show that the change of loss dip around 1550 nm is over 31 dB and the average sensitivity is up to 14.77 dB/m-1 in the bend radius range from ∞ to 47.48 cm. Our study details the general principles of the effect of high-index layers in the formation of the transmission loss dips in fiber optics.
KW - Optical fibers
KW - Optical fiber devices
KW - Optical fiber losses
KW - Optical fiber dispersion
KW - Optical fiber interference
UR - http://www.scopus.com/inward/record.url?scp=85094637736&partnerID=8YFLogxK
U2 - 10.1109/jlt.2020.3010101
DO - 10.1109/jlt.2020.3010101
M3 - Article
SN - 0733-8724
VL - 38
SP - 6352
EP - 6361
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 22
M1 - 9143420
ER -