Journal
IEEE PHOTONICS JOURNAL
Volume 13, Issue 6, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2021.3117659
Keywords
Effective Brillouin gain spectra; PRBS phase modulation
Funding
- National Key Research and Development Program of China [2018YFB0504500]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences [2020252]
- National Natural Science Foundation of China [61705243, 61735007, 61805261]
- Special Project for Research and Development in Key areas of Guangdong Province [2018B090904001]
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This study investigates the stimulated Brillouin scattering process in a fiber system with phase modulation by PRBS, showing that PRBS modulation can effectively suppress SBS. The experimental results confirm the reliability of the theoretical model.
We describe stimulated Brillouin scattering process in a fiber system with light field phase modulated by lowpass filtered and amplified pseudo random bit sequence (PRBS) using localized nonfluctuating source model. The effective Brillouin gain spectra and the ratio of normalized Stimulated Brillouin Scattering (SBS) threshold to RMS optical linewidth is used to characterize the SBS suppression capability of the PRBS phase modulation. The normalized effectiveBrillouin gain spectra for different modulation parameters are calculated to exhibit the Brillouin gain broadening process. Based on the theoretical model, we find that the SBS threshold reaches a maximum for the ratio of cutoff frequency to clock rate r(c) = 0.53 and RMS modulation depth k(rms) = 0.55 pi for PRBS9. An effective Brillouin gain spectrum measurement setup is established, and the theoretical predictions are verified by the experiment.
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