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

Volume

28

Issue

11

fYear

2010

fDate

6/1/2010 12:00:00 AM

Firstpage

1677

Lastpage

1684

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);

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2010.2047844

Filename

5446352