Dynamic analysis of erbium-doped optically pumped waveguide lasers using a time-domain travelling wave model |
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Authors: | YU S F YUK T I SHUM P |
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Institution: | (1) Department of Electrical and Electronic Engineering, University of Hong Kong, Pokfulam Road, Hong Kong |
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Abstract: | A simple and straightforward dynamic model of Er3+-doped optically pumped waveguide lasers using a time-domain algorithm is
developed. The theoretical model is based on (a) time-dependent rate equations of a quasi-two-level system for the population
densities and (b) time-dependent travelling wave equations for the pump and signal power which are solved simultaneously in
the time domain. In addition, the longitudinal distribution of spontaneous emission noise is also taken into consideration.
Using the fast Fourier transform, the spectrum profile of the time-domain signal power is calculated. In this paper, the transient
responses of population densities, pump and signal power are investigated for Er3+-doped Ti:LiNbO3 waveguide lasers. To demonstrate
the sophistication of this time-domain model, the influence of the cross-coupled effect of the travelling waves due to the
optical feedback of an etched grating is also studied. Dynamic response of the waveguide laser with and without a grating
are compared.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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