Abstract
Er-doped fibers are expected to play a major role as amplifiers in communication systems. Coherent spectroscopical techniques are important tools for investigations of the dynamics of optical transitions and can help to characterize the active transition in Er fibers. Photonecho techniques have been used previously to study Nd-and Pr-doped glasses,1 and even Nd-doped fibers.2 Here we report the first study of photon echo in Er-doped fibers. In our experiment, unlike those in earlier works, the femtosecond excitation pulses were shorter than the inhomogeneous dephasing time, making it possible to temporally resolve the echo pulse. These studies will also help to determine the role of coherent effects on the propagation of ultrashort pulses in these fibers.
© 1991 Optical Society of America
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