Large Blue Shift on Post-Fabrication Resonance Wavelength Adjustment of Long-Period Fiber Gratings

2008 ◽  
Author(s):  
Katsumi Morishita ◽  
Eijun Hirao
Keyword(s):  
Blue Shift ◽  
Resonance Wavelength ◽  
Fiber Gratings ◽  
Long Period ◽  
Long Period Fiber Gratings

scholarly journals Helically twisted long-period fiber gratings of YOFC single-mode fiber with optical fiber welding machine

2021 ◽  
Vol 51 (3) ◽  
Author(s):  
Yunfeng Bai ◽  
Zelong He ◽  
Jiyuan Bai ◽  
Suihu Dang
Keyword(s):  
Single Mode ◽  
Resonance Wavelength ◽  
Single Mode Fiber ◽  
Resonant Peak ◽  
Fiber Grating ◽  
Fiber Gratings ◽  
Long Period ◽  
Welding Machine ◽  
Long Period Fiber Gratings ◽  
Period Fiber Grating

The single-mode fiber provided by YOFC inc is employed for spiral processing by commercial welding machine. It can clearly see the periods structure under the light, but there is no obvious deformation of the fiber core, cladding and surface morphology under a microscope. There is an obvious resonant peak near 1560 nm, half peak width is about 25 nm, the depth of the resonant peak closed to –26 dB, when the period is about 411 μm. It agrees with theoretical calculation results according to the long-period fiber grating coupled-mode theory. The resonance wavelength is caused by coupling between the fundamental mode and the LP14 mode. The responsivities of the helically twisted long-period fiber gratings (H-LPFG) for the temperature is measured, the resonance wavelength is linear with temperature, the slope is 86 pm/℃. Because it is easy to inscribe by commercial welding machine, and has a strong resonance peak, it has potential applications as the temperature sensor.

Fabrication and resonance wavelength adjustment of long-period fiber gratings

2005 ◽  
Author(s):  
Dejun Feng ◽  
Chee S. Goh ◽  
Sze Y. Set ◽  
Tao Liu ◽  
Kazuro Kikuchi
Keyword(s):  
Resonance Wavelength ◽  
Fiber Gratings ◽  
Long Period ◽  
Long Period Fiber Gratings

scholarly journals Spectral Tuning of Long Period Fiber Gratings Fabricated by Femtosecond Laser Micromachining through Thermal Annealing

Proceedings ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 4
Author(s):  
Duarte Viveiros ◽  
José M. M. M. de Almeida ◽  
Luís Coelho ◽  
Helena Vasconcelos ◽  
Vítor A. Amorim ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Blue Shift ◽  
Writing System ◽  
Direct Writing ◽  
Fiber Gratings ◽  
Long Period ◽  
Femtosecond Laser Micromachining ◽  
Wavelength Sensitivity ◽  
Before And After ◽  
Long Period Fiber Gratings

A femtosecond laser direct writing system was developed to explore the fabrication of long-period fiber gratings (LPFGs) in SMF28 fibers. The LPFGs, showing the mode LP1,6 at 1500 nm, were exposed to high-temperature annealing up to 950 °C. Modifications in the refractive index (RI) modulation are observed through a blue-shift in the LPFG attenuation bands and above 850 °C, the mode LP1,7 appear at 1600 nm. The wavelength sensitivity to external RI from 1.300 to 1.452 was estimated for both modes before and after annealing. Greater sensitivity was found for the higher order mode in the entire range reaching 2400 nm/RIU around 1.440.

Strain-Insensitive Simultaneous Measurement of Bending and Temperature Based on Cascaded Long-Period Fiber Gratings Inscribed on Double-Clad Fiber

2021 ◽  
pp. 1-1
Author(s):  
Jinsil Han ◽  
Jihoon Kim ◽  
Seul-Lee Lee ◽  
Sungwook Choi ◽  
Yong Wook Lee
Keyword(s):  
Simultaneous Measurement ◽  
Fiber Gratings ◽  
Long Period ◽  
Long Period Fiber Gratings

scholarly journals Long period fiber gratings written in photonic crystal fibers by use of CO2 laser

2013 ◽  
Vol 3 (3) ◽  
pp. 193-201 ◽  
Author(s):  
Yiping Wang ◽  
Changrui Liao ◽  
Xiaoyong Zhong ◽  
Jiangtao Zhou ◽  
Yingjie Liu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Co2 Laser ◽  
Photonic Crystal Fibers ◽  
Fiber Gratings ◽  
Long Period ◽  
Long Period Fiber Gratings ◽  
Crystal Fibers
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