Stimulated Brillion Scattering Based All Optical Format Conversion And Secure Optical Communications

Stimulated Brillouin Scattering (SBS) is a nonlinear effect generatedby the interactions of the pump light, stokes light and the acoustic waves,which is a common phenomenon in fiber. Many valuable researches basedon SBS have been developed ever since its initial observation in1964.In this paper, our latest exploring progresses in fields of high data ratesignal format conversion and high speed secure communication using SBSare presented. The theories of SBS based format conversion, spectrabroadening and optical secure transmissions are also illustrated proceedingfrom Maxwell wave equation.In aspect of format conversion, we theoretically analyzed the signalformat conversion process from differential phase shifted keying (DPSK)to on-off keying (OOK) as well as the anti-process employing SBS indetail. The mutual format conversion of10-Gb/s signal is alsoexperimentally demonstrated.As for high speed secure communication, we proposed to use threekinds of pump light including single frequency laser, direct currentmodulating broadened spectra and optical frequency combs which generatevarious Brillouin gain/absorption spectra as keys to encrypt/decryptsignals. The feasibility and performance of the SBS based securecommunication system are analyzed by both simulations using Matlab andexperiments.