Tensile-strained single quantum well 20-wavelength distributed feedback laser arrays have been fabricated with a wide wavelength span of 56 nm in the 1.5 μm wavelength region. The light output is TM-polarised and the average threshold current is 22.8 mA for an 875 μm long array. A minimum laser linewidth of 180 kHz is measured by a delay self-heterodyne method.
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Zah et al. (1992) studied this question.
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