Results 241 to 250 of about 40,614 (314)

Tunable Broadband Mode Converter Based on Long-Period Fiber Gratings at 2-μm Waveband

Journal of Lightwave Technology, 2021
We demonstrate the fabrication of a broadband mode converter (MC) operating at 2 μm waveband based on long-period fiber gratings (LPFGs) written in the two-mode fiber (TMF) by CO2 laser.
Mingxu Li, Zinan Huang, Zuyao Liu, Chen Jiang, C. Mou, Yunqi Liu   +5 more
semanticscholar   +1 more source

Spectral and Sensing Performance of Long-Period Fiber Gratings at 2 μm Waveband

Journal of Lightwave Technology, 2021
In this paper, we demonstrate the transmission spectral and surrounding refractive index (SRI) sensing performance of long-period fiber gratings (LPFGs) at 2 μm waveband. The cladding modes operating at 2 μm waveband show higher SRI sensitivity than 1.55
Yunhe Zhao, W. Wang, Yunqi Liu, Zuyao Liu, Xuping Zhang, Yongsheng Yang   +5 more
semanticscholar   +1 more source

Optical fiber long-period grating sensors

Optics Letters, 1996
We present a novel class of highly sensitive sensors based on long-period fiber gratings that can be implemented with simple and inexpensive demodulation schemes. Temperature, strain, and refractive-index resolutions of 0.65 degrees C, 65.75 micro, and 7.69 x 10(-5), respectively, are demonstrated for gratings fabricated in standard telecommunication ...
V, Bhatia, A M, Vengsarkar
openaire   +3 more sources

Analysis of the Lowest Order Cladding Mode of Long Period Fiber Gratings Near Turn Around Point

Journal of Lightwave Technology, 2021
A long period fiber grating (LPFG) sensor has been fabricated, after theoretical analysis, obtaining the maximum enhancement of the evanescent field working with the lowest order cladding mode (LP0,2 cladding mode) near turn around point.
T. Dey, S. Tombelli, P. Biswas, A. Giannetti, N. Basumallick, F. Baldini, S. Bandyopadhyay, Cosimo Trono   +7 more
semanticscholar   +1 more source

Discretized superimposed optical fiber long-period gratings

Optics Letters, 2020
A novel technique, to the best of our knowledge, for the inscription of superimposed long-period gratings with arbitrary grating pitches is proposed and experimentally validated. The technique is based on the discretization of an ideal continuous sinusoidal refractive index (RI) pattern with a step function.
Trono Cosimo, Valeri Federico, Baldini Francesco   +2 more
openaire   +3 more sources

Sensing Characteristics of Collapsed Long Period Fiber Gratings in Tri-Hole Fiber

Journal of Lightwave Technology, 2021
We demonstrated a novel long-period fiber grating (LPFG) written in a tri-hole fiber (THF). The LPFG was fabricated by periodically collapsed micro holes utilizing CO2 laser irradiation integrated with pressure-assisted technology.
Tao Xi, Donghui Wang, Chao Ma, Libo Yuan
semanticscholar   +1 more source

Long-period fiber gratings based on periodic microbends

Optics Letters, 1999
We demonstrate a new type of high-performance long-period fiber grating based on arc-induced periodic microbends. The fabrication method is simple and does not require special fibers. Flexibility in controlling the filter parameters makes it possible to produce arbitrary filter profiles by use of a simple apodization technique, which is difficult to do
Hwang, IK, Yun, SH, Kim, BY Kim, Byoung Yoon   +2 more
openaire   +2 more sources

Optimization of Refractive Index Sensitivity in Nanofilm-Coated Long-Period Fiber Gratings Near the Dispersion Turning Point

Journal of Lightwave Technology, 2020
In this article, we present detailed investigation of the high-performance long-period fiber gratings (LPFGs) based surrounding refractive index (SRI) sensors.
Fang Zou, Yunqi Liu, C. Mou, Shan-Ji Zhu
semanticscholar   +1 more source

Long-period fiber grating sensors

Optical Fiber Communications, OFC., 2005
Summary form only given. We propose novel long-period grating-based optical fiber sensors that possess high sensitivities and simple demodulation schemes, and can be easily configured for multiparameter measurements.
V. Bhatia, M.K. Burford, K.A. Murphy, A.M. Vengsarkar   +3 more
openaire   +1 more source

Tunable long-period fiber grating

SPIE Proceedings, 2003
Long-period fiber grating (LPFG) having grating periodicity in the hundreds of microns, functions as a band rejection filter. This device is useful for gain equalizing applications of fiber amplifiers.The transmission characteristics are mainly determined by the initial fabricating conditions such as grating periodicity and UV exposure time. Therefore,
Hisami Nishi, Akira Matsumura, Junji Nishii   +2 more
openaire   +1 more source