Presented is a theoretical study of double-clad Er-doped fiber power amplifier(EDFA). Two kinds of double clad fibers(DCF) with rectangular and "flower" inner clad shapes are studied, and these fibers have d...Presented is a theoretical study of double-clad Er-doped fiber power amplifier(EDFA). Two kinds of double clad fibers(DCF) with rectangular and "flower" inner clad shapes are studied, and these fibers have different coupling constants and propagation losses. We calculate the effective pump power absorption ratio along the fiber with different coupling constants from the first cladding to the doped core and with different propagation losses for the power in the inner cladding. Then the gains of the double clad Er-doped fiber amplifiers versus fiber lengths are calculated using the EDFA model based on propagation and rate equations of a homogeneous, two-level medium.展开更多
Based on propagation-rate equations, the influence of different input pulse durations on the properties of Er3+/Yb3+ co-doped double-clad fiber amplifier at dynamic equilibrium was analyzed. The change characteristic ...Based on propagation-rate equations, the influence of different input pulse durations on the properties of Er3+/Yb3+ co-doped double-clad fiber amplifier at dynamic equilibrium was analyzed. The change characteristic of output power sag with pulse duration and repetition rate was shown. Whether single or multi-channel input pulses are amplified, the shorter the input pulse duration is, the smaller the power sags of output pulse will be. At low repetition rate, upper gain values（G upper ） of gain swing are almost the same for different input pulse durations, which tend to the small signal gain, but lower gain value（G lower ） of short input pulse is larger than that of long input pulse. At high repetition rate, lower gain value（G lower ） approaches to upper gain value（G upper ）.展开更多
基金Foundation of Beijing Jiaotong University(2005RC034)
文摘Presented is a theoretical study of double-clad Er-doped fiber power amplifier(EDFA). Two kinds of double clad fibers(DCF) with rectangular and "flower" inner clad shapes are studied, and these fibers have different coupling constants and propagation losses. We calculate the effective pump power absorption ratio along the fiber with different coupling constants from the first cladding to the doped core and with different propagation losses for the power in the inner cladding. Then the gains of the double clad Er-doped fiber amplifiers versus fiber lengths are calculated using the EDFA model based on propagation and rate equations of a homogeneous, two-level medium.
文摘Based on propagation-rate equations, the influence of different input pulse durations on the properties of Er3+/Yb3+ co-doped double-clad fiber amplifier at dynamic equilibrium was analyzed. The change characteristic of output power sag with pulse duration and repetition rate was shown. Whether single or multi-channel input pulses are amplified, the shorter the input pulse duration is, the smaller the power sags of output pulse will be. At low repetition rate, upper gain values（G upper ） of gain swing are almost the same for different input pulse durations, which tend to the small signal gain, but lower gain value（G lower ） of short input pulse is larger than that of long input pulse. At high repetition rate, lower gain value（G lower ） approaches to upper gain value（G upper ）.
