This paper describes an improved solution to the standing-wave model (SWM) based on cold cavity modes for simulating DFB laser diodes. It is found that the longitudinal carrier distribution has an opposite pattern from that of the photon distribution inside the laser cavity. An approximation to the carrier distribution is made under the moderate power assumption. This fact allows the integrals involved in the standing-wave formulation to be analytically performed beforehand and also leads to a great reduction to the number of carrier rate equations to be solved, consequently resulting in a more efficient solution to the previously proposed SWM.
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