We study the spontaneous Raman scattering （RS） in taper-drawn micro/nano-fibers （MNFs） by employing the photon counting technique. The spectra of RS in five MNFs, which are fabricated by using different heating fl...We study the spontaneous Raman scattering （RS） in taper-drawn micro/nano-fibers （MNFs） by employing the photon counting technique. The spectra of RS in five MNFs, which are fabricated by using different heating flames （hydrogen flame or butane flame） and with different diameters, are measured within a frequency shift range of 1435 cm- 1_3200 cm- 1. From the measured spectra, we observe the RS peaks originated from silica and a unique RS peak with a frequency shift of - 2905 cm-1 （- 87.2 THz）. Unlike the former ones, the latter one is not observable in conventional optical fibers. Furthermore, the unique peak becomes obvious and starts to rapidly increase with the decrease of the diameter of MNFs when the diameter is smaller than 2 μm, and the intensity of the unique peak significantly depends on the heating flame used in the fabricating process. Our investigation is useful for the entanglement generation or optical sensing using taper-drawn MNFs.展开更多
Using the few-mode erbium-doped fiber(FM-EDF)with a simple two-layer erbium-doped structure,we demonstrate an all-fiber FM-EDF amplifier.The gain equalization among the six spatial modes supported by the FM-EDF is ach...Using the few-mode erbium-doped fiber(FM-EDF)with a simple two-layer erbium-doped structure,we demonstrate an all-fiber FM-EDF amplifier.The gain equalization among the six spatial modes supported by the FM-EDF is achieved when only the pump in the fundamental mode(LP01)is applied.When the signals in six spatial modes are simultaneously amplified,the average modal gain is about 15 dB,and differential modal gain is about 2.5 dB for the signal at 1550 nm.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11304222 and 11527808)the State Key Development Program for Basic Research of China(Grant No.2014CB340103)
文摘We study the spontaneous Raman scattering （RS） in taper-drawn micro/nano-fibers （MNFs） by employing the photon counting technique. The spectra of RS in five MNFs, which are fabricated by using different heating flames （hydrogen flame or butane flame） and with different diameters, are measured within a frequency shift range of 1435 cm- 1_3200 cm- 1. From the measured spectra, we observe the RS peaks originated from silica and a unique RS peak with a frequency shift of - 2905 cm-1 （- 87.2 THz）. Unlike the former ones, the latter one is not observable in conventional optical fibers. Furthermore, the unique peak becomes obvious and starts to rapidly increase with the decrease of the diameter of MNFs when the diameter is smaller than 2 μm, and the intensity of the unique peak significantly depends on the heating flame used in the fabricating process. Our investigation is useful for the entanglement generation or optical sensing using taper-drawn MNFs.
基金supported by the National Basic Research Program of China(No.2014CB340103/01)
文摘Using the few-mode erbium-doped fiber(FM-EDF)with a simple two-layer erbium-doped structure,we demonstrate an all-fiber FM-EDF amplifier.The gain equalization among the six spatial modes supported by the FM-EDF is achieved when only the pump in the fundamental mode(LP01)is applied.When the signals in six spatial modes are simultaneously amplified,the average modal gain is about 15 dB,and differential modal gain is about 2.5 dB for the signal at 1550 nm.
