Brillouin gain spectra(BGS)in an As2Se3 photonic crystal fiber(PCF)are investigated numerically.The profiles of the BGS are simulated by calculating the characteristics of different-order optical and acoustic waves in...Brillouin gain spectra(BGS)in an As2Se3 photonic crystal fiber(PCF)are investigated numerically.The profiles of the BGS are simulated by calculating the characteristics of different-order optical and acoustic waves in the PCFs with different core diameters.For the small-core PCF,there are two peaks in BGS,but there is only one peak for the large-core PCF.We also reveal that in the small-core PCF,the difference of Brillouin frequency shift between the LP01 and LP11 modes is obvious,while it is not obvious in the large-core PCF.The Brillouin threshold increases with the core diameter increasing.展开更多
We propose a switchable multi-wavelength erbium-doped fiber laser based on a four-mode fiber Bragg grating(FBG). The four-mode FBG is fabricated in a hydrogen pre-loaded fiber by the phase mask method, which can suppo...We propose a switchable multi-wavelength erbium-doped fiber laser based on a four-mode fiber Bragg grating(FBG). The four-mode FBG is fabricated in a hydrogen pre-loaded fiber by the phase mask method, which can support four linearly polarized modes around 1550 nm. The five operation wavelengths are at 1547.5, 1546.8,1546.0, 1545.1, and 1544.2 nm, respectively. Through adjusting the polarization state and the lateral offset coupling in cavity, the laser can be switched into the operation state of single, dual, or triple wavelengths. The proposed laser has the advantages of simple configuration, stable operation, and easy adjustment.展开更多
基金supported by the National Key R&D Program of China(No.2018YFB0504500)the National Natural Science Foundation of China(NSFC)(Nos.61875052,61905059,and 11374084)+1 种基金the Anhui Provincial Natural Science Foundation(No.1908085QF273)the Fundamental Research Funds for the Central Universities(Nos.PA2019GDQT0007 and JZ2019HGTA0037).
文摘Brillouin gain spectra(BGS)in an As2Se3 photonic crystal fiber(PCF)are investigated numerically.The profiles of the BGS are simulated by calculating the characteristics of different-order optical and acoustic waves in the PCFs with different core diameters.For the small-core PCF,there are two peaks in BGS,but there is only one peak for the large-core PCF.We also reveal that in the small-core PCF,the difference of Brillouin frequency shift between the LP01 and LP11 modes is obvious,while it is not obvious in the large-core PCF.The Brillouin threshold increases with the core diameter increasing.
基金supported by the National Natural Science Foundation of China(NSFC)(Nos.61875052,11374084,and 61307056)
文摘We propose a switchable multi-wavelength erbium-doped fiber laser based on a four-mode fiber Bragg grating(FBG). The four-mode FBG is fabricated in a hydrogen pre-loaded fiber by the phase mask method, which can support four linearly polarized modes around 1550 nm. The five operation wavelengths are at 1547.5, 1546.8,1546.0, 1545.1, and 1544.2 nm, respectively. Through adjusting the polarization state and the lateral offset coupling in cavity, the laser can be switched into the operation state of single, dual, or triple wavelengths. The proposed laser has the advantages of simple configuration, stable operation, and easy adjustment.
