High-frequency operation of 1.57-μm laterally coupled distributed feedback lasers with self-aligned Ohmic contacts and nickel surface gratings

Laterally coupled distributed feedback lasers with self-aligned ohmic contacts show the advantage of a considerably simplified fabrication process. These lasers exhibit superior spectral properties with full benefit from the gain coupling mechanism. Side-mode suppression ratios up to 55- and 3-dB bandwidths beyond 15 GHz were obtained for these devices.