Optics and Photonics Society of Iran

In this thesis, we study on type and structure optical fiber and one of the important scattering inside fiber, Brillouin scattering. Optical fiber has special properties such as high flexibility, immune to electromagnetic interference so has distributed application in different field such as sense.

In this work, we attention to optical fiber sensor in domain temperature and strain with Brillouin scattering. With improvement optical fiber appearing photonic crystal fiber that has complex structure and best efficiency.

We with Comsol and Matlab software design optimum photonic crystal fiber for temperature and strain sensor. Finally after test and simulation, temperature sensitivity in photonic crystal fiber no different with SMF fiber, but strain sensitivity about 20 percent increase in PCF in comparison with SMF fiber.

Different parameter has effect on this result such as pitch (Ʌ)-7.75µm-, hole size(d) -0.775µm- and wavelength(λ). Best sensitivity is for maximum pitch and minimum hole size and wavelength 1.32µm.