Title :
Polarization Effects in Tilted Fiber Bragg Grating Refractometers
Author :
Lu, Yu-Chun ; Geng, Rui ; Wang, Chuncan ; Zhang, Fan ; Liu, Chu ; Ning, Tigang ; Jian, Shuisheng
Author_Institution :
Key Lab. of All Opt. Network & Adv. Telecommun. Network, Beijing Jiaotong Univ., Beijing, China
fDate :
6/1/2010 12:00:00 AM
Abstract :
The polarization effects in tilted fiber Bragg grating (TFBG) refractometers are investigated theoretically. The polarization effects may degrade the sensor performance greatly, and should be considered to achieve high-precision surrounding refractive index (SRI) measurement. The possible paths to reduce the influence of polarization effects are discussed. For large SRI changes, the cutoff resonance wavelength can be used as sensing parameter to achieve a polarization insensitive SRI measurement with linear sensitivity of ~500 nm/u.r.i and SRI uncertainty of ~10-3 over SRI range of 0.1; for tiny SRI changes the measurement can be refined by monitoring proper individual resonance (close to the cutoff resonance wavelength) with accuracy approaching 2.5 ?? 10-5 over a SRI range of 0.001.
Keywords :
Bragg gratings; fibre optic sensors; optical fibre polarisation; refractive index measurement; refractometers; cutoff resonance wavelength; linear sensitivity; polarization effects; sensor performance; surrounding refractive index measurement; tilted fiber Bragg grating refractometers; Blazed gratings; complex mode; coupled mode theory; fiber optics sensor; perfectly matched layer (PML); radiation modes; refractometer; tilted fiber Bragg grating (TFBG);
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2010.2047844
