Longitudinal-mode characteristics for 1.3 μm GaInAsP/InP DFB lasers just below the threshold current

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Abstract
The stopband and the Bragg wavelength in a DFB laser were clearly observed by measuring longitudinal-mode characteristics just below the threshold current. It became clear that the first-order longitudinal-mode oscillation did not always occur. Coupling coefficients κ for the DFB laser were deduced to be 10 to 40 cm−1 from the stopband width.