Numerical analysis of reflection characteristics of cascaded non-uniform fiber Bragg gratings

E. Gemzický; J. Müllerová

doi:10.1117/12.820658

Abstract

The paper is devoted to the simulation and reflectance performance of the cascaded non-uniform fiber Bragg gratings (FBG). In a FBG, periodically spaced regions in the fiber core are varied. FBGs are key enabling technologies for fiber optical sensing for their high sensitivity and potentially low cost. Uniform, chirped, phase-shifted and sampled FBGs can be used in the sensing systems. The cascaded FBG configuration is created by several sections where each section has a specific number of segments. In our simulations the transfer matrix method has been used assuming the entire grating made up of sections. Using this method the FBG reflectance spectra have been simulated in MATLAB. The simulated reflectances of FBGs with several sections alternating along the length of the FBG have been described. The simulation results show that the FGB reflectance at the Bragg wavelength and the reflectance bandwidth depend on the Bragg grating periodicity that means on the periodicity in the sections. The bandwidth and the amplitude reflectance at the Bragg wavelength for the length grating of 10 mm with several sections have been studied. The effects of sections of different Bragg grating periods and refractive index profiles (the Gaussian profile or the sinc profile) have been numerically investigated. From the simulations one can see that the maxima of the energy of FBGs reflected by several apodized sections depend on the grating length. Moreover, it has been found out that the undesirable sidelobes between main reflectance maxima can be partly suppressed by using an appropriately designed cascaded grating.

Citation Download Citation

E. Gemzický, E. Gemzický, J. Müllerová, J. Müllerová, "Numerical analysis of reflection characteristics of cascaded non-uniform fiber Bragg gratings", Proc. SPIE 7356, Optical Sensors 2009, 73561R (18 May 2009); doi: 10.1117/12.820658; https://doi.org/10.1117/12.820658

ACCESS THE FULL ARTICLE

PERSONAL SIGN IN
Full access may be available with your subscription

Email or Username Forgot your username?

Password Forgot your password?

Show

Remember Email/Username on this computer

Remember Password

No SPIE account? Create an account
or Institutional Sign In via Shibboleth

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $14.40

Non-members: $18.00 ADD TO CART

Show All Keywords

Keywords/Phrases

Search In:

Publication Years