Long-period fiber gratings in twisted single-mode fibers written by high-frequency CO 2 laser pulses

2009 ◽  
Author(s):  
Tao Zhu ◽  
Yun-Jiang Rao Rao ◽  
King Seng Chiang ◽  
Cuihua Shi ◽  
Min Liu
Keyword(s):  
High Frequency ◽  
Single Mode ◽  
Laser Pulses ◽  
Fiber Gratings ◽  
Long Period ◽  
Long Period Fiber Gratings

scholarly journals Sensing and Demodulation of Special Long-Period Fiber Gratings Induced by ScanningCO2Laser Pulses

2012 ◽  
Vol 2012 ◽  
pp. 1-17 ◽  
Author(s):  
Tao Zhu ◽  
Leilei Shi ◽  
Min Liu ◽  
Wei Huang
Keyword(s):  
Single Mode ◽  
Laser Pulses ◽  
Single Mode Fiber ◽  
Wavelength Shift ◽  
Refractive Index Sensor ◽  
Fiber Gratings ◽  
Long Period ◽  
Investigation Methods ◽  
Long Period Fiber Gratings ◽  
Sensor Strain

A review of long-period fiber gratings (LPFGs) with special structures induced by scanning CO2laser pulses in single mode fiber (SMF) is presented in this paper. In the first part, the special structures and fabrication methods of LPFGs are demonstrated in detail. Next, the special LPFG-based sensors are demonstrated, such as refractive index sensor, strain sensor with temperature compensation, and torsion sensor without temperature crosstalking. Finally, several investigation methods including intensity, wavelength shift, and fiber ring laser demodulation are discussed.

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