To achieve low-threshold stable singlemode operation of membrane distributed feedback lasers consisting of GaInAsP/InP single-quantum-well wirelike active regions, a narrow-stripe buried heterostructure and a narrow pump beam were adopted. Room-temperature continuous wave operation by photopumping at a low threshold of 1.5 mW was obtained for a 2 µm wide and 120 µm long device based on a 142 nm thick membrane structure. A side-mode suppression ratio (SMSR) of 42 dB was obtained at 8 times the threshold.
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Okamoto et al. (2002) studied this question.
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