Threshold features of a Brillouin Stokes comb generated in a distributed fiber Raman amplifier.
We study threshold features of a Brillouin-shifted Stokes comb generated in a distributed fiber Raman amplifier. When the input power of Brillouin pump is linearly increased in high Raman gain, the first Stokes wave grows exponentially at much lower threshold power and then experiences an appreciable power decrease in the vicinity of the Brillouin comb's threshold. This power reduction of the first Brillouin Stokes, which we did not see mentioned in previous reports, was caused by a power transfer to higher-order lines and initiated Brillouin comb generation. Moreover, the effects of Raman pump power and pumping direction on the threshold of a Brillouin comb are investigated.
Park
Kap-Dong
KD
Center for Information and Telecommunication Standards, Korea Research Institute of Standards and Science, Daejeon 305-340, Korea. kdpark@kriss.re.kr
Ryu
Hanyoung
H
Lee
Won-Kyu
WK
Kim
Seung Kwan
SK
Moon
Han Seb
HS
Suh
Ho-Suhng
HS