An asymmetric quarter-wavelength-shifted DFB laser which has high differential efficiency and a large threshold gain difference under high-power operation has been designed taking the spatial hole-burning effect into account. The optimum kL was found to be about 1.4 in the laser, which has an asymmetry S/L of 0.15, where S is the distance from the centre to the phase shift position and L is the laser length.
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Soda et al. (1987) studied this question.
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