Experimental study of brillouin frequency shift on classical and modern botda, botdr setups

Brillouin scattering has many applications in optics. This thesis study is observing the effects of various optical elements and environmental factors Brillouin gain spectrum and frequency shift on different optical configurations. Methods to improve Brillouin readings in classical and modern BOTDA/BOTDR configurations are proposed. Effects of EDFA power on Brillouin gain spectrum are observed on a BOTDA setup with single mode fiber as FUT. Comparisons with respect to optical Rayleigh power are done. EDFA power interval for sufficient Brillouin gain is obtained. Then, effects of step increments of ambient temperature on Brillouin frequency shift are observed on a BOTDR setup with single mode fiber as FUT. The relation between temperature and Brillouin frequency shift is obtained. In addition, effects of test fiber length on Brillouin gain spectrum are observed on the BOTDR setup. The direct relation in between Brillouin power and fiber length is observed. Furthermore, different length and brand fiber cables are connected back to back and their Brillouin frequency shifts are observed. Brillouin gain spectrum for fiber very short fibers (40m) is obtained.