Design of photonic crystal fiber long-period grating refractive index sensor

2009 ◽  
Author(s):  
Jiri Kanka ◽  
Yinian Zhu ◽  
Zonghu He ◽  
Henry Du
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Refractive Index Sensor ◽  
Long Period Grating ◽  
Crystal Fiber ◽  
Long Period

Sensing Characteristics of Long-Period Grating Inscribed in Grapefruit Photonic Crystal Fiber by Femtosecond Laser

2014 ◽  
Vol 513-517 ◽  
pp. 4231-4234
Author(s):  
Yuan Wei ◽  
Yu Jie Du
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Femtosecond Laser ◽  
Photonic Crystal Fiber ◽  
Resonant Wavelength ◽  
Long Period Grating ◽  
Crystal Fiber ◽  
Long Period ◽  
Surrounding Refractive Index ◽  
Novel Method

A novel method for fabricating long period grating in grapefruit photonic crystal fiber (GPCF) is proposed and demonstrated. An 800nm femtosecond laser is adopted to scan a section of GPCF periodically point-by-point, resulting in effective refractive index periodic demodulation. High resonance of ~17dB is obtained with a grating length of 30 mm. The temperature sensitivity of resonant wavelength 0.03 nm/°C is obtained from 20°C to 120 °C. In addition, the relationship between resonant wavelength and surrounding refractive index (SRI), when LPFG immersed in refractive index of solution of different index, is also researched.

scholarly journals Power-Interrogated Refractive Index Sensor Using Long Period Grating in Photonic Crystal Fiber

2015 ◽  
Vol 2015 ◽  
pp. 1-4
Author(s):  
X. L. Jiang ◽  
Z. T. Gu ◽  
L. Zheng
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Transmitted Light ◽  
Transmitted Power ◽  
Leakage Loss ◽  
Long Period Grating ◽  
Light Power ◽  
Crystal Fiber ◽  
Long Period

We reported a long period grating (LPG) written in specially designed photonic crystal fiber (PCF) for refractive index (RI) sensing by interrogating the transmitted light power. The outermost ring of clad holes of the PCF is enlarged where the analyte is filled. We showed that the leakage loss of the clad mode increases with the RI in the larger holes. By numerically analyzing the complex couple mode equations for the core mode and the first clad mode, we found the depth of attenuation band in the transmitted spectra and the total transmitted power is sensitive to the leakage loss of the clad mode or the RI in the larger holes. We also demonstrated that the transmitted power is sensitive to the RI even less than that of the silica, which just avoids the limitation that the transmitted light power of LPG in conventional fiber is only sensitive to the RI of the external media higher than that of fiber clad.

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