An optical fiber sensor composed of a dislocation Mach-Zehnder interferometer(MZI) cascaded with a fiber Bragg grating(FBG) is proposed,and it is used to monitor the electrochemical corrosion of metals in experiments....An optical fiber sensor composed of a dislocation Mach-Zehnder interferometer(MZI) cascaded with a fiber Bragg grating(FBG) is proposed,and it is used to monitor the electrochemical corrosion of metals in experiments.The dislocation interferometer is composed of two segments of single-mode fiber(SMF) and one segment of dislocation SMF.The contact surface is increased between the fiber and the environment,which helps to improve the interference sensitivity.The relationship between the dislocation amount and the refractive index sensitivity of the interferometer is discussed through simulation.In the experiment,the sensitivity of the interferometer reaches more than 10 000 nm/RIU,and the monitoring of metal electrochemical corrosion is also realized in 3.5% NaCl solution.The proposed measurement scheme has the advantages of small structure,low cost and high sensitivity.It has good prospects in chemical reaction monitoring.展开更多
We demonstrate a multi-wavelength Brillouin-erbium fiber laser(BEFL)with narrow linewidth and tunable wavelength interval using dual-wavelength Brillouin pumping.The generation of multi-wavelength output in BEFL is ba...We demonstrate a multi-wavelength Brillouin-erbium fiber laser(BEFL)with narrow linewidth and tunable wavelength interval using dual-wavelength Brillouin pumping.The generation of multi-wavelength output in BEFL is based on the combination of stimulated Brillouin scattering(SBS)and four-wave mixing(FWM)effect in a fiber cavity.The tunable wavelength interval is determined by the artificially controlled wavelength interval of the pumping lasers.The BEFL could compress a 1 MHz pump laser to a 340 Hz Brillouin Stokes laser,which proves the BEFL has excellent capability of linewidth compression.An erbium-doped fiber pumped by 980 nm laser is inserted into the cavity to further amplify the Brillouin laser.The wideband multi-wavelength BEFL covering over 50 nm is successfully generated when the 980 nm pump power is 400 mW.These features of multi-wavelength BEFL provide an effective method for optical communication systems and optical fiber sensing.展开更多
The amplifying dynamics of the pulse burst in Yb^(3+)-doped fiber amplifier(YDFA)with high-power pulse pump is numerically analyzed by a finite-difference time-domain(FDTD)method.The numerical simulations show that th...The amplifying dynamics of the pulse burst in Yb^(3+)-doped fiber amplifier(YDFA)with high-power pulse pump is numerically analyzed by a finite-difference time-domain(FDTD)method.The numerical simulations show that the amplitude uniformity of the amplified pulse burst can be modified by adjusting the parameters of pump,such as relative delay and power.Though optimizing the pump parameters,we can reduce the gain difference between the pulses in a burst and improve the efficiency of coherent pulse stacking based on Gires-Tournois interferometers(GTIs).These results can be applied to the design of high energy ultra-short pulse amplifiers based on burst-mode amplification and coherent pulse stacking technology.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 61835006 and 12274238)。
文摘An optical fiber sensor composed of a dislocation Mach-Zehnder interferometer(MZI) cascaded with a fiber Bragg grating(FBG) is proposed,and it is used to monitor the electrochemical corrosion of metals in experiments.The dislocation interferometer is composed of two segments of single-mode fiber(SMF) and one segment of dislocation SMF.The contact surface is increased between the fiber and the environment,which helps to improve the interference sensitivity.The relationship between the dislocation amount and the refractive index sensitivity of the interferometer is discussed through simulation.In the experiment,the sensitivity of the interferometer reaches more than 10 000 nm/RIU,and the monitoring of metal electrochemical corrosion is also realized in 3.5% NaCl solution.The proposed measurement scheme has the advantages of small structure,low cost and high sensitivity.It has good prospects in chemical reaction monitoring.
基金supported by the National Key Research and Development Program of China(No.2018YFB0504400)the National Natural Science Foundation of China(Nos.61775107,11674177 and 61640408)the Tianjin Natural Science Foundation(No.19JCZDJC31200)。
文摘We demonstrate a multi-wavelength Brillouin-erbium fiber laser(BEFL)with narrow linewidth and tunable wavelength interval using dual-wavelength Brillouin pumping.The generation of multi-wavelength output in BEFL is based on the combination of stimulated Brillouin scattering(SBS)and four-wave mixing(FWM)effect in a fiber cavity.The tunable wavelength interval is determined by the artificially controlled wavelength interval of the pumping lasers.The BEFL could compress a 1 MHz pump laser to a 340 Hz Brillouin Stokes laser,which proves the BEFL has excellent capability of linewidth compression.An erbium-doped fiber pumped by 980 nm laser is inserted into the cavity to further amplify the Brillouin laser.The wideband multi-wavelength BEFL covering over 50 nm is successfully generated when the 980 nm pump power is 400 mW.These features of multi-wavelength BEFL provide an effective method for optical communication systems and optical fiber sensing.
基金supported by the National Key Research and Development Program of China(No.2018YFB0504400)the National Natural Science Foundation of China(Nos.61775107,11674177,61640408)the Tianjin Natural Science Foundation(No.19JCZDJC31200)。
文摘The amplifying dynamics of the pulse burst in Yb^(3+)-doped fiber amplifier(YDFA)with high-power pulse pump is numerically analyzed by a finite-difference time-domain(FDTD)method.The numerical simulations show that the amplitude uniformity of the amplified pulse burst can be modified by adjusting the parameters of pump,such as relative delay and power.Though optimizing the pump parameters,we can reduce the gain difference between the pulses in a burst and improve the efficiency of coherent pulse stacking based on Gires-Tournois interferometers(GTIs).These results can be applied to the design of high energy ultra-short pulse amplifiers based on burst-mode amplification and coherent pulse stacking technology.
