A Stimulated Brillouin Scattering Based Generation of Single Sideband-Suppressed Carrier (SSB-SC) Signal

摘要

In this research, a new cost effective wavelength shifter has been proposed. A frequency shifter is demonstrated in this research to realize a shift of signals in the mm-wave region. Proposed technique provides a single sideband signal without the carrier signal due to the stimulated Brillouin scattering in optical fiber. Bandwidth efficiency of double sideband signals is less as compared to SSB-SC signal. The frequency shifter is all optical due to the fact that it uses a optical fiber?s performance degrading issue such as SBS as a application. This generation of enhanced carrier power and single sideband is dependent on the Brillouin scattering and principle of gain and loss spectrum of SBS inside optical fiber is used to eliminate the up shifted frequency component and enhance the low shifter frequency component. A single sideband is obtained from SBS phenomenon which is useful in advance modulation formats and requires less bandwidth. It is noteworthy that SSB-SC signal is realized using all optical method and proposed work eliminates the necessary of non optical components such as 90° hybrid couplers. SSB-SC signals are well competent to combat with pulse broadening issues and have potential to work in terahertz frequency. To validate the performance of generated signal, transmission of SSB-SC signal is also presented. Moreover, SSB-SC, SSB with carrier, DSB-SC and DSB with carrier signals are compared in terms of Q-factor at varied link lengths.