摘要
受激布里渊散射 (SBS)的抑制是实现光纤参量放大的重要技术要求 ,已有文献报道多采用对抽运光进行相位调制的方法 ,将光功率分散到多个频率分量上来达到这一目的。提出一种二次调相的方法 ,在已有 2GHz相位调制的商品光源上施加 36 5MHz的二次相位调制 ,将高非线性光纤 (HNLF)的受激布里渊散射阈值由未加任何调制时的 10dBm至少提高到 2 3 5dBm ,达到了参量放大的要求。在此基础上 ,进行了连续波 (CW )抽运的光纤参量放大实验。实验中采用长度为 14 5 0m ,非线性系数γ =11 9W-1km-1,色散斜率S =0 0 15 5ps/(nm2 ·km)的高非线性光纤 ,使用外腔可调谐激光器 (ECL)作为信号光源 ,小信号增益带宽达到 2 6nm(增益 >10dB) ,峰值增益达到2 4dB。同时还观察到了由于非线性拉曼放大作用造成的长波长信号光增益大于短波长信号光增益的不对称性。
Suppression of the stimulated Brillouin scattering (SBS) is an important technology for realization of fiber parametric amplification. Phase modulation is employed in the early literatures to meet this purpose. A new method is proposed that a secondly phase modulation is applied on a modulated optical source. Based on this technique, by adding a 365 MHz phase modulation to the 2 GHz phase modulated laser source, the stimulated Brillouin scattering threshold is improved from 10 dBm to 23.5 dBm. Continuous wave (CW) pump optical parametric amplification is demonstrated experimentally in a 1450 m-long highly nonlinear fiber (HNLF), with the nonlinear coefficient γ=11.9 W -1km -1, dispersion slope S=0.0155 ps/(nm2·km). Using an external cavity laser (ECL) as the signal, 26 nm bandwidth (gain>10 dB) and 24 dB maximum gain for small signal are obtained.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2004年第7期802-806,共5页
Chinese Journal of Lasers
关键词
光电子学
光纤参量放大
相位调制
受激布里渊散射
非线性
optoelectronics
fiber parametric amplification
phase modulation
stimulated Brillouin scattering
nonlinearity
