Transient analysis of short, high-concentration, gain-clamped Er/sup 3+/-Yb/sup 3+/ codoped fiber amplifiers

Abstract

A theoretical study of the dynamics of short highconcentration gain-clamped Er 3+ -Yb 3+ codoped fiber amplifiers is presented. The effect of various parameters on the transient power excursions and relaxation oscillation frequency of a given signal input channel when other signal channels are added or dropped from an initial steady-state configuration is analyzed. In particular, the effects of Er 3+ clustering, Yb 3+ concentration, fiber length, lasing wavelength, pump wavelength, pump power, and cavity losses are shown. The numerical results demonstrate the importance of Yb 3+ sensitization in achieving stable gainclamped operation in a range of operating conditions. It is shown that the amplitude of power excursions is typically small, e.g., less than 0.1 dB, provided that the amount of Er 3+ ions in the clusters is kept small.

Neodymium, erbium, and ytterbium co-doped fiber amplifier

“…15,16 These properties have led to the recent development of efficient and shorter amplifiers. 7,[17][18][19][20] There are other rare earth ions codoped with Er ions for different EDFA improvements. 21,22 In Nd-Yb co-doped fiber amplifiers, Nd is added to the YDFA in order to further increase the output power and to extend the pumping schemes.…”