A Coupling Method from Hollow-Core Fiber with Large Core Diameter to Single Mode Fiber

2019 ◽  
Author(s):  
Xiang Chen ◽  
Xiongwei Hu ◽  
Lvyun Yang ◽  
J inggang Peng ◽  
Haiqing Li ◽  
...  
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Coupling Method ◽  
Hollow Core ◽  
Large Core ◽  
Core Diameter ◽  
Core Fiber

scholarly journals High coupling efficiency technology of large core hollow-core fiber with single mode fiber

2019 ◽  
Vol 27 (23) ◽  
pp. 33135 ◽  
Author(s):  
Xiang Chen ◽  
Xiongwei Hu ◽  
Lei Liao ◽  
Yingbin Xing ◽  
Gui Chen ◽  
...  
Keyword(s):  
Coupling Efficiency ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Hollow Core ◽  
Large Core ◽  
Core Fiber

scholarly journals Kagome Hollow Core Fiber-Based Mid-Infrared Dispersion Spectroscopy of Methane at Sub-ppm Levels

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3352 ◽  
Author(s):  
Karol Krzempek ◽  
Krzysztof Abramski ◽  
Michal Nikodem
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Difference Frequency Generation ◽  
Hollow Core ◽  
Large Core ◽  
Core Diameter ◽  
Mid Infrared ◽  
Core Fiber ◽  
Crystal Fibers ◽  
Long Fibers

In this paper, we demonstrate the laser-based gas sensing of methane near 3.3 µm inside hollow-core photonic crystal fibers. We exploit a novel anti-resonant Kagome-type hollow-core fiber with a large core diameter (more than 100 µm) which results in gas filling times of less than 10 s for 1.3-m-long fibers. Using a difference frequency generation source and chirped laser dispersion spectroscopy technique, methane sensing with sub-parts-per-million by volume detection limit is performed. The detection of ambient methane is also demonstrated. The presented results indicate the feasibility of using a hollow-core fiber for increasing the path-length and improving the sensitivity of the mid-infrared gas sensors.

scholarly journals Splicing and Coupling Losses in Hollow-Core Photonic Crystal Glass Fibers

2010 ◽  
Vol 161 ◽  
pp. 43-49 ◽  
Author(s):  
J.P. Carvalho ◽  
F. Magalhães ◽  
O. Frazão ◽  
J.L. Santos ◽  
F.M. Araújo ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Gas Sensing ◽  
Glass Fibers ◽  
Effective Diffusion ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Crystal Glass ◽  
Hollow Core ◽  
Sensing Applications ◽  
Core Fiber

Hollow-core photonic crystal glass fibers have a high potential for gas sensing applications, since large light-gas interaction lengths can be effectively attained. Nevertheless, in order to enhance effective diffusion of gas into the hollow-core fiber, multi-coupling gaps are often needed, which raise coupling loss issues that must be evaluated prior to the development of practical systems. In this paper, a study on the coupling losses dependence on lateral and axial gap misalignment for single-mode fiber and two different types of hollow-core photonic crystal glass fibers is carried out. In addition, an experimental technique on splicing these glass fibers is also described and some results are presented showing that low splice losses can be obtained with high reproducibility.

scholarly journals High efficient beam cleanup based on stimulated Brillouin scattering with a large core fiber

2014 ◽  
Vol 32 (4) ◽  
pp. 517-521 ◽  
Author(s):  
Qilin Gao ◽  
Zhiwei Lu ◽  
Chengyu Zhu ◽  
Jianhui Zhang
Keyword(s):  
Brillouin Scattering ◽  
Beam Quality ◽  
Stimulated Brillouin Scattering ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Large Core ◽  
Novel Approach ◽  
High Efficient ◽  
Core Fiber ◽  
Stimulated Brillouin

AbstractA novel approach of beam cleanup based on stimulated Brillouin scattering with a large core fiber is proposed to improve the laser beam quality. The fusion splice scheme from a single-mode fiber to a very large core fiber (105 µm) is first employed in stimulated Brillouin scattering to steadily excite the fundamental mode of the Stokes beam. As a result, the output beam achieves a measured M2 value of around 1.3 meanwhile the pump conversion efficiency is up to 90%, which is the best in the reports of stimulated Brillouin scattering cleanup to our knowledge.

scholarly journals Low loss and high performance interconnection between standard single-mode fiber and antiresonant hollow-core fiber

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dmytro Suslov ◽  
Matěj Komanec ◽  
Eric R. Numkam Fokoua ◽  
Daniel Dousek ◽  
Ailing Zhong ◽  
...  
Keyword(s):  
Cross Coupling ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Higher Order ◽  
Field Size ◽  
Hollow Core ◽  
Low Loss ◽  
Alternative Mode ◽  
Mode Field ◽  
Core Fiber

AbstractWe demonstrate halving the record-low loss of interconnection between a nested antiresonant nodeless type hollow-core fiber (NANF) and standard single-mode fiber (SMF). The achieved interconnection loss of 0.15 dB is only 0.07 dB above the theoretically-expected minimum loss. We also optimized the interconnection in terms of unwanted cross-coupling into the higher-order modes of the NANF. We achieved cross-coupling as low as −35 dB into the LP$$_{11}$$ 11 mode (the lowest-loss higher-order mode and thus the most important to eliminate). With the help of simulations, we show that the measured LP$$_{11}$$ 11 mode coupling is most likely limited by the slightly imperfect symmetry of the manufactured NANF. The coupling cross-talk into the highly-lossy LP$$_{02}$$ 02 mode ($$>2000$$ > 2000  dB/km in our fiber) was measured to be below −22 dB. Furthermore, we show experimentally that the anti-reflective coating applied to the interconnect interface reduces the insertion loss by 0.15 dB while simultaneously reducing the back-reflection below −40 dB over a 60 nm bandwidth. Finally, we also demonstrated an alternative mode-field adapter to adapt the mode-field size between SMF and NANF, based on thermally-expanded core fibers. This approach enabled us to achieve an interconnection loss of 0.21 dB and cross-coupling of −35 dB into the LP$$_{11}$$ 11 mode.

Highly sensitive optical fiber bending sensor based on hollow core fiber and single mode fiber

Optik ◽  
2021 ◽  
Vol 228 ◽  
pp. 166209
Author(s):  
Y.D. Niu ◽  
Q. Chen ◽  
Chunliu Zhao ◽  
D.N. Wang
Keyword(s):  
Optical Fiber ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Hollow Core ◽  
Highly Sensitive ◽  
Core Fiber ◽  
Bending Sensor

Fiber-optic Michelson interferometer based on α-Fe2O3/ZrO2 sensing membrane and its application in trace fluoride-ion detection

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Zizheng Yue ◽  
Wenlin Feng
Keyword(s):  
Silver Film ◽  
Fiber Optic ◽  
Michelson Interferometer ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Ion Concentration ◽  
Fluoride Ion ◽  
Ion Detection ◽  
Core Fiber ◽  
Sensing Membrane

Abstract In this work, a fiber-optic fluoride-ion-detection Michelson interferometer based on the thin-core fiber (TCF) and no-core fiber (NCF) coated with α-Fe2O3/ZrO2 sensing film is proposed and presented. The single-mode fiber (SMF) is spliced with the TCF and NCF in turn, and a waist-enlarged taper is spliced between them. Then, a silver film is plated on the end face of NCF to enhance the reflection. After the absorption of fluoride ion by the sensing film, the effective refractive index (RI) of the coated cladding will change, which leads to the regular red shift of the interference dip with the increasing fluoride-ion concentration. Thus, the fluoride-ion concentrations can be determined according to the corresponding dip wavelength shifts. The results show that the sensor has an excellent linear response (R 2 = 0.995) with good sensitivity (8.970 nm/ppm) when the fluoride-ion concentration is in the range of 0–1.5 ppm. The response time is about 15 s. The sensor has the advantage of good selectivity, good temperature and pH stabilities, and can be applied to detect fluoride ion effectively.

Michelson liquid-level sensor based on cascaded no-core fiber and single-mode fiber structure

Optik ◽  
2020 ◽  
Vol 206 ◽  
pp. 163746 ◽  
Author(s):  
Dejiu Feng ◽  
Min Liu ◽  
Wenlin Feng ◽  
Bangxing Li
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Liquid Level ◽  
Fiber Structure ◽  
Level Sensor ◽  
Core Fiber ◽  
Liquid Level Sensor
Sign in / Sign up

Export Citation Format

Share Document