The fabrication of Bragg gratings on silicon-on-insulator （SOI） rib waveguides using electron-beam lithography is presented. The grating waveguide is optimally designed for actual photonic integration. Experimental ...The fabrication of Bragg gratings on silicon-on-insulator （SOI） rib waveguides using electron-beam lithography is presented. The grating waveguide is optimally designed for actual photonic integration. Experimental and theoretical evaluations of the Bragg grating are demonstrated. By thinning the SOl device layer and deeply etching the Bragg grating, a large grating coupling coefficient of 30cm^-1 is obtained.展开更多
To obtain the influence rules of the coating parameters of a long-period fiber grating(LPFG)with respect to temperature,strain and refractive index sensing properties,based on the mode coupling theory,a strict four-la...To obtain the influence rules of the coating parameters of a long-period fiber grating(LPFG)with respect to temperature,strain and refractive index sensing properties,based on the mode coupling theory,a strict four-layer theorietical model of a metal film coated LPFG is established,and these parameters that affect the spectral characteristics of the metal film coated LPFG are studied.The simulation results show that there is an optimal metal film thickness on the surface of the LPFG that will induce the surface-plasmon resonance(SP R)effect,which results in higher sensitivity to the environmental temperature and refractive index but has little influence on the strain There is theoretical evidence that when the silver thickness is between0.8and1.2nm,the refractive index sensitivity will reach the peak point of42.4026,at which the refractive index sensor sensitivity is increased by4.S%.The theoretical results of coating a long-period fiber grating provide a good theoretical basis and guidance for LPFG design and parameters optimization展开更多
We present the generation of the nanosecond cylindrical vector beams(CVBs)in a two-mode fiber(TMF)and its applications of stimulated Raman scattering.The nanosecond(1064 nm,10 ns,10 Hz)CVBs have been directly produced...We present the generation of the nanosecond cylindrical vector beams(CVBs)in a two-mode fiber(TMF)and its applications of stimulated Raman scattering.The nanosecond(1064 nm,10 ns,10 Hz)CVBs have been directly produced with mode conversion efficiency of~18 d B(98.4%)via an acoustically induced fiber grating,and then the stimulated Raman scattering signal is generated based on the transmission of the nanosecond CVBs in a 100-m-long TMF.The transverse mode intensity and polarization distributions of the first-order Stokes shift component(1116.8 nm)are consistent with the nanosecond CVBs pump pulse.展开更多
基于实用化光学频率梳的应用需求,开展了自启动、长期稳定锁模的飞秒掺铒光纤激光源实验研究。该激光源主要由激光振荡器和光纤放大器组成,其中激光振荡器是基于全保偏光纤结构和半导体可饱和吸收镜构成的,具有高实用性和高可靠性等优势...基于实用化光学频率梳的应用需求,开展了自启动、长期稳定锁模的飞秒掺铒光纤激光源实验研究。该激光源主要由激光振荡器和光纤放大器组成,其中激光振荡器是基于全保偏光纤结构和半导体可饱和吸收镜构成的,具有高实用性和高可靠性等优势,输出锁模脉冲的重复频率为116 MHz,平均功率为3 m W,脉冲宽度为385 fs;为了提高激光输出的参数指标,实验上研究了全保偏光纤放大系统,进一步将激光输出功率提升至218 m W,相应的单脉冲能量近1.9 n J,并通过优化脉冲压缩器中光纤长度,最终获得脉宽为42 fs的超短脉冲激光输出。该实用化飞秒掺铒光纤激光源非常适用于极端环境下光频计量研究。展开更多
文摘The fabrication of Bragg gratings on silicon-on-insulator （SOI） rib waveguides using electron-beam lithography is presented. The grating waveguide is optimally designed for actual photonic integration. Experimental and theoretical evaluations of the Bragg grating are demonstrated. By thinning the SOl device layer and deeply etching the Bragg grating, a large grating coupling coefficient of 30cm^-1 is obtained.
基金National Natural Science Foundation of China(No.51309001)Scientific Research Key Project of Anhui Province(No.KJ2017A041)
文摘To obtain the influence rules of the coating parameters of a long-period fiber grating(LPFG)with respect to temperature,strain and refractive index sensing properties,based on the mode coupling theory,a strict four-layer theorietical model of a metal film coated LPFG is established,and these parameters that affect the spectral characteristics of the metal film coated LPFG are studied.The simulation results show that there is an optimal metal film thickness on the surface of the LPFG that will induce the surface-plasmon resonance(SP R)effect,which results in higher sensitivity to the environmental temperature and refractive index but has little influence on the strain There is theoretical evidence that when the silver thickness is between0.8and1.2nm,the refractive index sensitivity will reach the peak point of42.4026,at which the refractive index sensor sensitivity is increased by4.S%.The theoretical results of coating a long-period fiber grating provide a good theoretical basis and guidance for LPFG design and parameters optimization
基金supported by the National Natural Science Foundation of China(NSFC)(Nos.11974282,61675169,and 91950207)。
文摘We present the generation of the nanosecond cylindrical vector beams(CVBs)in a two-mode fiber(TMF)and its applications of stimulated Raman scattering.The nanosecond(1064 nm,10 ns,10 Hz)CVBs have been directly produced with mode conversion efficiency of~18 d B(98.4%)via an acoustically induced fiber grating,and then the stimulated Raman scattering signal is generated based on the transmission of the nanosecond CVBs in a 100-m-long TMF.The transverse mode intensity and polarization distributions of the first-order Stokes shift component(1116.8 nm)are consistent with the nanosecond CVBs pump pulse.
文摘基于实用化光学频率梳的应用需求,开展了自启动、长期稳定锁模的飞秒掺铒光纤激光源实验研究。该激光源主要由激光振荡器和光纤放大器组成,其中激光振荡器是基于全保偏光纤结构和半导体可饱和吸收镜构成的,具有高实用性和高可靠性等优势,输出锁模脉冲的重复频率为116 MHz,平均功率为3 m W,脉冲宽度为385 fs;为了提高激光输出的参数指标,实验上研究了全保偏光纤放大系统,进一步将激光输出功率提升至218 m W,相应的单脉冲能量近1.9 n J,并通过优化脉冲压缩器中光纤长度,最终获得脉宽为42 fs的超短脉冲激光输出。该实用化飞秒掺铒光纤激光源非常适用于极端环境下光频计量研究。
