Zamzuri A K, Mahdi M A, Al-Mansoori M H, Samsuri N Md, Ahmad A, Islam M S
Photonic Transmission Unit, TM Research & Development, TMR&D Innovation Centre, Lingkaran Teknokrat Timur, 63000 Cyberjaya, Selangor, Malaysia.
Opt Express. 2009 Sep 14;17(19):16904-10. doi: 10.1364/OE.17.016904.
We report experimental results demonstrating the variation of optical signal-to-noise ratio (OSNR) of laser lines in Brillouin-Raman fiber laser against Raman pump power (RPP) variation. The reduction of OSNR is attributed to the spectral broadening of laser lines depending on the RPP. The spectral broadening is owing to the effect of the interaction between laser lines and turbulent waves (nonlinear interaction between longitudinal cavity modes). In our experiment, the worst OSNR is obtained at 650 mW RPP as a result of maximum spectral broadening when the Brillouin pump wavelength is fixed at 1555 nm. On the other hand, the OSNR improvement is obtained for RPP beyond 650 mW due to the effect of red-shift, the Raman peak gain is shifted away from the laser lines generated around 1555 nm thus reduces the spectral broadening effect.
我们报告了实验结果，该结果表明了布里渊 - 拉曼光纤激光器中激光线的光信噪比（OSNR）随拉曼泵浦功率（RPP）变化的情况。OSNR的降低归因于取决于RPP的激光线光谱展宽。光谱展宽是由于激光线与湍流波之间相互作用（纵向腔模之间的非线性相互作用）的影响。在我们的实验中，当布里渊泵浦波长固定在1555 nm时，由于最大光谱展宽，在RPP为650 mW时获得了最差的OSNR。另一方面，由于红移效应，对于超过650 mW的RPP可获得OSNR的改善，拉曼峰值增益从在1555 nm左右产生的激光线移开，从而降低了光谱展宽效应。
