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Dual wavelength slot coupled Fabry-Perot semiconductor laser

We present the device fabrication and experimental results of a dual wavelength slot coupled semiconductor laser for photonic millimeter-wave generation. The threshold current of the laser is about 35 mA. Dual-mode lasing with wavelength difference around 0.35nm was realized with SMSR better than 28 dB. By tuning the bias currents of the laser sections, the wavelength detuning of the doublet mode can be continuously tuned from 0.3nm to 0.42nm with SMSR better than 25 dB, corresponding to a frequency difference between 37.5 GHz and 52.5 GHz.