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The geometry of the nanosandwich waveguide is shown in (a); The MP mode and higher order mode are presented in (b) and (c), respectively; the sketch of the coupled waveguide model is plotted in (d).
The energy level diagram of the Er, Yb codoped system.
The normalized numbers of photons in the nanosandwiches along the waveguide with different doping concentration and different decay time of signal are presented in (a) and (b), respectively.
The gain ability of single nanosandwich in the waveguide as the function of concentration and decay time . The thresholds of amplification radiation are remarked by black dotted-line curve.
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